Question 1

Guide to select proper quartz glass grades by spectral band and working environment. Learn key machining points and our custom processing service for optical & semiconductor applications.

Accepted Answer

How to select the suitable quartz glass grade for projects?The core of selection is to combine the working spectral band and actual working environment. If your project focuses on deep ultraviolet transmission such as UV lithography and ultraviolet detection, JGS1 is the preferred option. For conventional visible light and near-ultraviolet optical equipment, JGS2 can fully meet the requirements. If the equipment works in the infrared band, JGS3 with optimized infrared performance is the best choice. For semiconductor production lines with ultra-high purity requirements, synthetic fused silica is a must. We suggest providing detailed working conditions, spectral parameters and usage environment, and our technical team will recommend the most cost-effective solution. What are the key points for quartz glass machining?Quartz glass has high hardness and brittleness, so the processing requirements are much stricter than ordinary glass. Cutting and grinding must adopt professional diamond tools. For semiconductor-grade high-precision optical parts, CMP chemical mechanical polishing is used to achieve sub-nanometer surface roughness. After machining, annealing treatment is indispensable to release internal stress and prevent cracking during later use. For ultra-high purity products used in semiconductors, the whole processing process needs to be completed in a dust-free clean room to avoid surface contamination. Meanwhile, we support customized processing according to customer drawings, samples and special technical indicators.

Question 2

Felix Glass supplies quartz glass in 3 purity grades (industrial, semiconductor, optical) with strict quality standards for different applications.

Accepted Answer

Q6: What purity grades of quartz glass can you supply?A: We provide quartz glass with three different purity levels to match different industry standards and usage requirements. The general industrial grade has a silica content of no less than 99.95%, which meets the demands of conventional high-temperature equipment and ordinary industrial observation windows. The semiconductor grade is the highest standard, with silica content up to 99.999%, and all metallic impurities are controlled at ppb level. This strict standard is essential to avoid contamination during wafer processing and chip production. The optical grade focuses on controlling internal defects and OH content, and we adjust the parameters according to the required spectral band to guarantee stable optical transmittance and imaging effect. All our products follow unified quality inspection procedures before delivery.

Question 3

the temperature resistance limit of quartz glass，Thermal Performance & Temperature Resistance

Accepted Answer

A: Thermal performance is one of the core advantages of quartz glass. For high-grade synthetic quartz glass, the long-term safe continuous working temperature is 1100°C to 1200°C. In short-time working conditions, it can bear a maximum temperature up to 1300°C. Apart from high temperature resistance, its thermal shock resistance is also outstanding. The qualified products can endure rapid heating and cooling cycles with a temperature difference up to 1000°C without cracking or deformation. It is worth noting that the temperature resistance will be slightly affected by material purity and internal OH content. Products with higher purity and lower hydroxyl content perform better in long-term high-temperature service.

Question 4

JGS1, JGS2 and JGS3 are standard grades for optical quartz. JGS1 suits deep UV, JGS2 for regular UV and visible light, and JGS3 is dedicated to infrared use.

Accepted Answer

A1: They are standard optical quartz grades. JGS1 for deep UV, JGS2 for conventional UV & visible light, JGS3 for infrared applications.：Optical Quartz Grades JGS1 JGS2 JGS3Detailed Explanation JGS1, JGS2 and JGS3 are internationally recognized standard grades for optical fused quartz glass, classified mainly by spectral transmittance range and hydroxyl (OH) content. Each grade is engineered for specific light bands and working environments. 1. JGS1It features ultra-low hydroxyl content and the widest transmission range from 160 nm to 2500 nm. It delivers outstanding transmittance for deep ultraviolet (deep UV) light below 220 nm and has strong resistance to UV aging.Typical uses: Deep UV lithography, high-precision UV spectrometers, aerospace UV optical windows and professional deep UV laboratory equipment.2. JGS2With low hydroxyl content, its transmission spectrum covers 220 nm to 2500 nm. It performs well across conventional ultraviolet and visible light bands, and balances stable performance and cost. It is the most cost-effective general-purpose grade.Typical uses: UV sterilization lamps, UV curing systems, general laboratory optical instruments and civil UV optoelectronic products.3. JGS3This grade has medium hydroxyl content and a transmission range of 260 nm to 3500 nm. It is optimized to reduce infrared absorption, achieving superior transmittance in long-wave infrared bands.Typical uses: Infrared thermal imaging cameras, infrared detection systems, high-temperature infrared observation windows and industrial infrared temperature measurement devices.   Concise Extended Version (for embedded FAQ block) JGS series optical quartz is graded by spectral performance: - JGS1: 160nm~2500nm, ultra-low OH group, exclusive for deep UV applications.- JGS2: 220nm~2500nm, balanced performance for regular UV and visible light, widely used for general UV equipment.- JGS3: 260nm~3500nm, low infrared absorption, specially designed for infrared transmission and thermal imaging.

Question 5

Introduce the main categories of quartz glass classified by appearance and application standards.

Accepted Answer

Product Classifications & JGS Optical GradesQ4: How many types of quartz glass are there? What are JGS1, JGS2 and JGS3?A: Quartz glass has two mainstream classification methods, divided by manufacturing process and optical grade respectively. Classified by production craft, there are four main categories. Synthetic fused silica features ultra-high purity for high-end optics and semiconductors. Electrically fused quartz has low hydroxyl content and stable performance under high temperature. Gas-fused quartz is cost-effective and widely used in general industrial occasions. Opaque quartz glass contains tiny air bubbles inside, mainly used for heat insulation.The JGS series is the standard optical grade widely recognized in the industry. JGS1 is the far-ultraviolet grade with high OH content, its deep ultraviolet transmittance is top-tier, with a cut-off wavelength of about 170 nm, mainly applied to UV lithography and spectral analysis instruments. JGS2 is the universal UV-visible grade, with a cut-off wavelength of around 220 nm, which is the standard choice for laboratory utensils and conventional optical components. JGS3 is dedicated to infrared scenarios, with low OH content, optimized for the spectral range of 260 nm to 3000 nm, and commonly used in infrared spectroscopy and thermal imaging devices.

Question 6

Learn key differences between quartz glass and ordinary glass in composition, heat resistance and ultraviolet transmittance. ultraviolet rays.

Accepted Answer

Q3: What fundamental differences exist between quartz glass and common soda-lime glass?A: Ordinary soda-lime glass is the most common glass for daily use, while quartz glass belongs to high-performance special glass. The gaps between them are reflected in composition, heat resistance, optical performance, chemical stability and production process. In terms of chemical composition, ordinary glass contains only 70% to 75% silicon dioxide, and a large amount of soda ash, lime and other additives are added to reduce the melting temperature. In contrast, quartz glass is almost purely composed of silica. When it comes to thermal performance, ordinary glass will gradually soften at around 600°C, and it is very easy to crack when encountering rapid temperature changes. Quartz glass can work continuously at 1100°C to 1200°C, and its thermal expansion coefficient is nearly zero, so it can withstand drastic cold and hot impact. For optical performance, ordinary glass cannot transmit ultraviolet light below 300 nm, while quartz glass realizes full-spectrum transmission from deep UV to infrared. Chemically, quartz glass is resistant to erosion by most acids and organic solvents, while ordinary glass is vulnerable to corrosion by alkaline substances. Besides, the production of quartz glass needs to reach over 2000°C, which puts forward higher requirements on production equipment and technology.：Quartz Glass vs Borosilicate Glass

Question 7

Fused quartz is produced from natural quartz ore with moderate purity. Fused silica is synthetic ultra-high purity material featuring fewer impurities and superior optical performance.

Accepted Answer

Q2: What is the difference between fused silica and fused quartz?A: These two names are frequently used interchangeably in the industry, but they are distinguished by raw materials, production technology, internal composition and practical performance, and are suitable for completely different application scenarios.AspectFused Silica (Synthetic)Fused Quartz (Natural)Raw MaterialMade from synthetic silicon compounds through flame hydrolysis or CVD technologyProcessed from natural high-purity quartz crystals and silica sandPurity LevelUltra-high purity, metallic impurities are controlled at ppb levelHigh purity, impurities stay at ppm level, slightly lower than synthetic typeOH Content1000–2000 ppmLess than 5–30 ppm after vacuum or electric meltingOptical FeatureExcellent deep ultraviolet transmission, the cut-off wavelength is about 170 nmBetter infrared transmission performance, relatively weak in deep ultraviolet bandMain UsageSemiconductor lithography equipment, deep UV laser optical componentsInfrared optical systems, long-term high-temperature industrial structural partsIn actual procurement and design, engineers will select materials strictly according to the spectral requirements and working environment of the equipment to avoid performance mismatch.：Fused Silica vs Fused Quartz

Question 8

Quartz glass (fused quartz) is a premium industrial material made of 99.5%~99.999% SiO₂, boasting great heat resistance, chemical stability and full-spectrum transmittance.

Accepted Answer

A: Quartz glass, also universally known as fused silica or fused quartz, is a special amorphous inorganic glass material produced by melting high-purity silica raw materials at an ultra-high temperature above 2000 degrees Celsius. Its main chemical composition is silicon dioxide, with the content reaching no less than 99.95%. Different from traditional crystalline quartz, it has no fixed crystal structure, which endows it with a series of excellent comprehensive properties. It can stably transmit light in ultraviolet, visible light and infrared full spectral bands, and owns extremely low thermal expansion coefficient, outstanding high temperature resistance and strong chemical inertness. Thanks to these advantages, quartz glass has become an indispensable core material in high-end optical systems, semiconductor manufacturing, precision laboratory equipment, high-temperature industrial furnaces and many other high-tech fields. Our company provides standard and customized quartz glass parts covering tubes, plates, rods, windows and various machined components to meet diversified technical demands from global clients.What Is Quartz Glass?

Question 9

Customization and manufacturing capabilities overview

Accepted Answer

Yes, we provide full custom optical manufacturing services including CNC machining, optical polishing, drawing review, and prototyping. We support OEM and ODM projects from design optimization to mass production, ensuring precise tolerance control and consistent quality.We offer professional custom optical manufacturing solutions for global clients seeking high-precision optical components, including full-service OEM and ODM optical fabrication, CNC optical machining, ultra-precision optical polishing, technical drawing review, custom optical prototyping, and mass production support. As an experienced optical manufacturer, we specialize in custom-made optical windows, lenses, prisms, glass plates, infrared optical components, laser optics, and precision optical parts used in medical devices, automotive LiDAR, aerospace systems, industrial inspection, and optical instrumentation industries. Our full-cycle custom optical manufacturing process covers every essential stage from design consultation, drawing verification, optical structure optimization, material selection, precision processing, surface polishing, optical coating, quality inspection to final bulk production. We strictly control dimensional tolerance, surface quality, flatness, parallelism, transmittance, and optical uniformity to ensure stable and reliable optical performance for all customized optical products. We support customized optical manufacturing based on customer drawings, custom parameters, or application requirements. Whether clients require small-batch optical prototyping for project testing or large-volume OEM optical mass production, we deliver consistent high quality, precise specifications, and stable lead time. With advanced optical processing equipment and professional optical engineering teams, we provide reliable one-stop custom optical fabrication services for worldwide industrial and commercial optical buyers.

Question 10

Explanation of different optical coating functions.

Accepted Answer

AR coatings reduce surface reflection and increase light transmission. AG coatings diffuse reflected light to reduce glare, improving readability under strong lighting. AF coatings create a hydrophobic surface that resists fingerprints, oil, and contamination. These coatings are often combined for enhanced performance.Professional optical coatings including AR coating, AG coating, and AF coating are widely applied on precision optical glass and optical components to upgrade optical performance, visual experience, and surface durability for industrial, commercial, and consumer optical devices. AR coating, also known as anti-reflection coating, is designed to effectively reduce unwanted surface reflection on optical glass surfaces. By minimizing reflective light loss, AR optical coating significantly increases overall light transmittance, delivering clearer optical imaging, higher light utilization rate, and improved contrast. This anti-reflection solution is essential for high-precision lenses, display glass, optical windows, and laser optical parts that require ultra-high light transmission and low reflection performance. AG coating, or anti-glare coating, features a special micro-structure surface that diffuses incident reflected light evenly instead of generating concentrated harsh glare. The anti-glare coating greatly reduces strong light reflection and screen dazzling problems under bright lighting environments such as sunlight and indoor high-bright lamps. With optimized diffuse reflection performance, AG coated glass greatly improves screen readability, viewing comfort, and visual stability, making it ideal for display screens, touch panels, instrument panels, and outdoor optical display equipment. AF coating, short for anti-fingerprint coating, forms a smooth and dense hydrophobic and oleophobic protective film on the glass surface. The advanced anti-fingerprint surface effectively resists fingerprints, oil stains, dust, water droplets, and daily contamination. It greatly simplifies surface cleaning, maintains long-term surface smoothness and transparency, and enhances the service life and appearance quality of optical glass components. To achieve comprehensive and upgraded optical performance, multi-layer composite coating combinations of AR+AG, AR+AF, and AR+AG+AF are commonly customized. Combined optical coatings provide low reflection, anti-glare, high transmittance, anti-fingerprint, and anti-pollution advantages simultaneously, which perfectly meets high-standard requirements for medical displays, automotive optics, industrial touch screens, precision optical instruments, and outdoor optical equipment.

Question 11

Surface treatment options for display cover glass.

Accepted Answer

Display cover glass can be treated with AR (anti-reflective), AG (anti-glare), and AF (anti-fingerprint) coatings. These coatings improve visibility, reduce reflections, and prevent surface contamination, making them ideal for industrial, medical, and outdoor display applications.High-quality display cover glass can be professionally enhanced with multi-functional optical coatings, including AR anti-reflective coating, AG anti-glare coating, and AF anti-fingerprint coating, to deliver superior optical performance, excellent surface protection, and stable long-term display quality for various advanced display devices. AR anti-reflective coating effectively eliminates harmful surface reflection and minimizes light loss on the cover glass surface. By improving overall light transmittance and optimizing light transmission efficiency, AR coating significantly enhances display clarity, color reproduction, and screen contrast, ensuring sharp and vivid visual output even under complex lighting conditions. AG anti-glare coating features a precision micro-etched surface structure that uniformly diffuses harsh reflected light. This advanced anti-glare treatment eliminates dazzling glare, reduces mirror reflection effects, and greatly improves screen readability in bright environments such as direct sunlight, strong indoor lighting, and high-bright working scenarios. AG coated display cover glass effectively relieves visual fatigue and provides stable, comfortable viewing experience for long-time operation. AF anti-fingerprint coating forms a highly hydrophobic and oleophobic protective layer on the glass surface. The smooth nano-coating effectively repels fingerprints, water droplets, oil stains, dust, and daily surface contamination. It maintains a clean, smooth, and transparent glass surface at all times, reduces frequent cleaning maintenance, and greatly extends the service life of display cover panels. These professional optical coatings can be used individually or combined into AR+AG, AR+AF, and full AR+AG+AF composite coating solutions according to customer application requirements. With optimized visibility, ultra-low reflection, anti-glare performance, and excellent anti-pollution surface protection, coated display cover glass is perfectly suitable for industrial touch displays, medical equipment screens, outdoor terminal displays, automotive display panels, smart device screens, and high-precision optical display systems, providing reliable and high-performance cover glass solutions for commercial and industrial display applications.

Question 12

Advantages of sapphire and IR domes in extreme conditions.

Accepted Answer

Sapphire optical domes are used in aerospace and surveillance systems due to their exceptional hardness, scratch resistance, and optical clarity. They protect sensitive optical systems in harsh environments such as high pressure, high temperature, and outdoor exposure while maintaining excellent infrared transmission.Sapphire optical domes are premium-grade precision optical components widely adopted in high-end aerospace systems, military monitoring equipment, infrared surveillance systems, and outdoor optoelectronic detection devices, renowned for their extreme mechanical hardness, outstanding scratch resistance, superior structural stability, and ultra-high optical clarity across broad spectral ranges. Manufactured from high-purity synthetic sapphire material, sapphire domes feature excellent physical and chemical properties that far exceed ordinary optical glass. With exceptional surface hardness and powerful abrasion resistance, sapphire optical domes effectively resist surface scratches, particle erosion, and mechanical wear during long-term service, maintaining perfect surface finish and stable optical performance in rigorous working conditions. Designed as protective optical housings for sensitive optical sensors, infrared cameras, and precision imaging systems, sapphire optical domes provide reliable all-round protection for core optical modules in extremely harsh environments. They stably withstand extreme working conditions including high pressure impact, high-temperature radiation, low-temperature freezing, strong wind erosion, and long-term outdoor ultraviolet exposure, avoiding structural deformation, surface damage or optical performance attenuation caused by complex environmental factors. In addition to superior mechanical durability, sapphire domes deliver excellent infrared transmittance and stable spectral performance in the infrared band. With low optical loss and uniform light transmission characteristics, these optical domes ensure accurate infrared signal reception, clear imaging quality, and consistent detection sensitivity for surveillance and aerospace optical systems. Due to the perfect combination of ultra-hard mechanical performance, excellent environmental adaptability, and high infrared optical permeability, high-precision sapphire optical domes have become indispensable core protective components for aerospace optoelectronic equipment, night vision surveillance systems, outdoor monitoring devices, and high-precision industrial infrared detection systems.

Question 13

Guide for selecting optical materials based on wavelength and environment.

Accepted Answer

Optical material selection depends on wavelength range, thermal resistance, and application environment. BK7 is commonly used for visible optics, fused silica performs well in UV and high-temperature environments, sapphire offers extreme hardness and durability, while ZnSe and ZnS are ideal for infrared applications. Proper selection ensures optimal transmission and system performance.Professional optical material selection is a critical foundation for achieving ideal optical transmission efficiency, stable thermal performance, and long-term reliable system operation, which mainly depends on three core factors: working wavelength range, thermal resistance capability, and actual application environment. Different optical substrates feature unique spectral transmittance, mechanical strength, temperature resistance, and chemical stability, making customized material selection essential to match various optical system requirements and maximize overall equipment performance. BK7 optical glass is the most widely used standard optical material for visible light optical systems. Featuring excellent visible spectral transmittance, uniform optical performance, low bubble and impurity rate, and stable processing adaptability, BK7 glass is ideal for conventional visible optical lenses, optical windows, prisms, and general industrial optical components. With cost-effective performance and mature processing technology, BK7 remains the preferred material for standard visible-light optical applications. Fused silica, also known as quartz glass, delivers outstanding performance for ultraviolet (UV) applications and high-temperature working environments. It possesses excellent UV transmittance, extremely low thermal expansion coefficient, and superior high-temperature resistance. Fused silica optical components can maintain stable optical and structural performance under high heat, intense UV radiation, and rapid temperature changes, making them the optimal choice for UV optical instruments, laser systems, and high-temperature industrial optical equipment. Sapphire optical material stands out for its extreme surface hardness, exceptional scratch resistance, and outstanding mechanical durability. Compared with ordinary optical glass, sapphire features stronger pressure resistance, impact resistance, and chemical corrosion resistance. It performs stably in severe environments such as high pressure, strong friction, and long-term outdoor exposure, widely applied in high-end aerospace, surveillance, and precision protective optical systems. For infrared optical systems requiring long-wave infrared transmission, ZnSe (Zinc Selenide) and ZnS (Zinc Sulfide) are the most professional and reliable infrared optical materials. Both materials provide excellent infrared spectral transmittance with low optical absorption and uniform infrared imaging performance. They are extensively utilized in infrared imaging devices, thermal detection systems, laser infrared equipment, and military night vision optical components. Accurate and reasonable optical material selection ensures optimized light transmission, minimized optical loss, stable thermal resistance, and consistent long-term system performance, helping customers achieve higher precision, better stability, and longer service life for customized optical projects

Question 14

Felix Glass is a precision optical glass manufacturer providing OEM/ODM custom optical components including lenses, prisms, domes, filters, and coated glass for global industrial applications.

Accepted Answer

Felix Glass is a professional manufacturer specializing in custom optical glass components and precision optical engineering solutions. We provide OEM and ODM services for global industrial clients requiring high-performance optical systems.Our core product portfolio includes optical lenses (plano-convex, aspheric, cylindrical), precision optical prisms, sapphire and infrared optical domes, bandpass and IR filters, and display cover glass with advanced AR (anti-reflective), AG (anti-glare), and AF (anti-fingerprint) coatings.We support full-process manufacturing capabilities including optical material selection (BK7, fused silica, sapphire, ZnSe, ZnS), CNC machining, precision polishing, coating deposition, prototyping, and mass production. Every component is manufactured under strict dimensional, surface quality, and optical performance control standards.Our solutions are widely used in medical imaging systems, aerospace and defense optics, machine vision equipment, laser systems, automotive sensing modules, and scientific instruments. In addition to manufacturing, we provide engineering support for optical design optimization, material selection guidance, and manufacturability evaluation (DFM), helping customers improve performance while reducing production risk and cost.

Question 15

Felix Glass provides flexible lead times for optical glass orders: standard products ship in 7–15 working days, custom orders match your schedule, with global shipping options.

Accepted Answer

As a reliable optical glass supplier, we understand the importance of on-time delivery for your projects, and we offer flexible lead times and shipping terms to meet your requirements. Lead Times: - Standard Products: For our in-stock optical glass domes, lenses and windows, we typically ship within 7-15 working days after order confirmation and payment.- Custom Orders: Lead times for custom optical glass components depend on complexity, size and order volume. Our team will provide a detailed production schedule during the quotation process, with typical lead times ranging from 20-45 working days. We also offer expedited production services for urgent projects, subject to availability. Shipping Terms:We support a variety of global shipping options to meet your delivery timeline and budget: - Express Courier: For small orders and prototypes, we ship via DHL, FedEx or UPS, with delivery times of 3-7 days to most countries.- Air Freight: For medium-sized orders, we offer air freight shipping with delivery times of 7-14 days.- Sea Freight: For large-volume orders, we provide sea freight shipping with delivery times of 30-45 days, offering the most cost-effective solution. We can also work with your preferred logistics provider and offer flexible Incoterms (FOB, CIF, DDP, etc.) to simplify the shipping process. Our sales team will provide you with tracking information once your order is shipped, so you can monitor the delivery status in real time. At Felix Glass, we are committed to reliable, on-time delivery, and we will keep you updated on the progress of your order every step of the way.

Question 16

Felix Glass provides full OEM/ODM custom optical glass services: design consultation, prototype development, mass production, and after-sales support for global optical equipment manufacturers

Accepted Answer

Absolutely. As a customer-centric optical glass supplier, we specialize in providing turnkey OEM and ODM custom optical glass solutions for global optical equipment manufacturers, engineering companies and research institutions. Our custom service process includes: 1. Requirement Consultation: Our optical engineering team works closely with you to understand your application, performance requirements, budget and timeline, providing professional recommendations on material selection, design optimization and coating solutions.2. Design & Prototyping: We develop custom designs based on your specifications, using advanced optical simulation software to verify performance. We then produce prototypes for your testing and validation, with quick turnaround times for small-batch trial runs.3. Mass Production: Once the prototype is approved, we scale up production using our high-precision manufacturing equipment, maintaining consistent quality and tight tolerances across large orders. We offer flexible production volumes, from small batches to high-volume runs.4. Quality Assurance & Delivery: All custom optical glass products undergo the same rigorous quality testing as our standard products. We provide full inspection reports and coordinate global shipping, with flexible delivery terms to meet your project schedule. Whether you need a custom optical dome for a new surveillance camera, a specialized lens for a medical device, or a complete optical system component, Felix Glass can provide a tailored solution to meet your exact needs.

Question 17

Felix Glass is an ISO-certified optical glass supplier, implementing strict quality management systems throughout the manufacturing process, from raw material inspection to final product testing.

Accepted Answer

Yes, Felix Glass is an ISO 9001:2015 certified optical glass supplier, committed to delivering consistent, high-quality optical products to our customers worldwide. Our ISO certification means that every stage of our manufacturing process adheres to internationally recognized quality management standards: 1. Raw Material Control: We only source optical-grade raw materials from qualified suppliers, with incoming inspection for purity, homogeneity and optical properties to ensure batch-to-batch consistency.2. Process Control: Our production lines follow standardized operating procedures (SOPs) for grinding, polishing, coating and assembly, with in-process inspections at every critical step to prevent defects.3. Quality Testing: Every optical glass product undergoes comprehensive testing before shipment, including dimensional tolerance checks, surface quality inspection, optical transmittance measurement, coating performance verification and environmental durability testing.4. Continuous Improvement: Our quality management system includes regular audits, corrective action processes and customer feedback loops to continuously improve our products and services. As an ISO-certified optical glass supplier, we provide full inspection reports, material certificates and quality documentation upon request, giving you complete confidence in the reliability and performance of our products.

Question 18

Felix Glass offers full OEM/ODM custom optical glass services, including design consultation, prototyping, mass production, and after-sales support for global optical equipment manufacturers.

Accepted Answer

As a leading optical glass supplier with over years of manufacturing experience, Felix Glass offers a comprehensive portfolio of high-precision optical components tailored to meet the diverse needs of global industries. Our core product range includes: - Optical domes: Precision domes made from BK7/K9 glass, sapphire and fused silica, with custom sizes, coatings and tolerances for surveillance, underwater, aerospace and industrial use.- Optical lenses: Spherical, aspherical and cylindrical lenses for imaging, illumination and laser applications, available in various materials and coatings.- Optical windows: Flat, wedged and protective windows with anti-reflective, high-reflective and other specialized coatings for sensors, lasers and optical systems.- Prisms and beam splitters: Right-angle prisms, penta prisms, roof prisms and custom beam splitters for light path manipulation in optical instruments.- Custom optical components: We support OEM/ODM manufacturing of non-standard optical parts according to customer drawings, samples and technical specifications, including complex shapes, special materials and unique coating requirements. All our optical glass products are manufactured under strict quality control standards, with raw material selection, precision processing, surface polishing, coating application and final inspection completed in-house. We serve customers in aerospace, defense, medical, life sciences, industrial automation and consumer optics, providing reliable, high-performance optical solutions.

Question 19

optical domes feature outstanding scratch and wear resistance with high‑hardness sapphire material and DLC diamond‑like carbon coating, ideal for outdoor, underwater and harsh industrial environments.

Accepted Answer

Our optical domes are designed with hierarchical scratch resistance solutions according to different application environments, meeting the wear and impact protection needs of various harsh scenarios. Sapphire optical domes are the highest grade in scratch resistance, with Mohs hardness up to 9, second only to diamond. It has super strong anti-scratch, anti-abrasion, high temperature resistance and chemical corrosion resistance, not easy to be scratched by sand, dust and hard foreign objects in long-term outdoor, underwater and aerospace environments, maintaining long-term surface finish and clear imaging effect. For conventional BK7/K9 optical glass domes, we can deposit high-performance DLC diamond-like carbon coating on the polished surface. The DLC coating has ultra-high surface hardness, effectively improving scratch resistance, friction resistance and anti-fouling ability, avoiding daily wear and surface scratches affecting optical transmittance. In addition, we can match hydrophobic and anti-fog coating on the basis of scratch resistance, making the optical dome surface waterproof, oil-proof, not easy to adhere dust and water mist, reducing manual cleaning and maintenance frequency. Felix Glass can recommend the most suitable material and coating scratch resistance solution according to your installation environment, working temperature and service life requirements, ensuring the optical domes maintain stable performance for years of continuous operation.

Question 20

Felix Glass offers full OEM & ODM customization for optical domes, supporting custom size, thickness, curvature, edge finishing and optical coating per customer CAD drawings and specs.

Accepted Answer

Yes, we are a professional manufacturer fully capable of providing full-size and full-parameter customized optical domes for global customers, covering prototype small-batch trial production to large-scale mass stable supply. We can customize all core parameters of optical domes, including outer diameter, inner diameter, uniform or tapered wall thickness, spherical curvature radius and concentricity accuracy. We support various edge processing methods such as flat mouth, chamfer, rounding and special-shaped mounting structure, and can process strictly in accordance with customer CAD drawings, PDF technical specifications or physical sample copying requirements. We adopt high-precision CNC grinding equipment and ultra-precision polishing technology to strictly control dimensional tolerance, surface quality and optical performance of each customized optical dome. Optional materials include BK7/K9 optical glass, synthetic sapphire and fused silica, matched with multi-layer AR anti-reflective, IR infrared, DLC wear-resistant and hydrophobic anti-fog coatings according to working wavelength and application environment. Our professional optical engineering team can also provide design optimization suggestions for your structural parameters, helping you balance optical performance, mechanical strength and cost budget. All customized optical domes implement full-process quality inspection, provide inspection reports and qualification certificates, and support stable long-term order delivery for overseas importers, engineering companies and optical equipment manufacturers.

Question 21

Professional optical domes use high-homogeneity materials and precision polishing for higher transmittance, lower distortion, tighter tolerances, and better coating adaptability.

Accepted Answer

There are essential differences in raw material composition, production process, optical performance and application scenarios between professional optical domes and ordinary glass. Ordinary glass mostly adopts common soda-lime raw materials, containing a large number of internal impurities, bubbles, stripes and uneven material density. Its light transmittance is low, optical distortion is serious, dimensional tolerance is loose, and it cannot bear precise optical matching and thin-film coating process, only suitable for building doors, windows and simple isolation protection, absolutely unable to meet the requirements of precision imaging and photoelectric sensing equipment. In contrast, Felix Glass optical domes use high-purity optical grade raw materials with strict material sorting and fine annealing treatment to eliminate internal stress. After ultra-precision grinding and high-precision surface polishing, the surface reaches high scratch-dig grade with ultra-smooth roughness, achieving ultra-high light transmittance, excellent optical uniformity and extremely low imaging distortion. Meanwhile, optical domes have stable physical and chemical properties, strong temperature shock resistance and corrosion resistance, and can perfectly match various professional optical coatings such as AR, IR and DLC. For high-end surveillance cameras, underwater detection systems, aerospace photoelectric pods and industrial machine vision equipment, only professional optical domes can ensure long-term stable and clear optical performance, while ordinary glass will cause image deformation, light scattering and equipment failure in a short time.

Question 22

Our optical components are used in medical, aerospace, automotive, laser, and machine vision systems requiring high precision performance.

Accepted Answer

Our optical components are widely used in medical devices, aerospace systems, automotive sensors, laser equipment, machine vision systems, and scientific instruments. Each application requires specific material and coating configurations to ensure optimal performance.Our custom precision optical components are extensively engineered and supplied for diversified high-end industries, covering medical diagnostic devices, aerospace optoelectronic systems, automotive LiDAR & optical sensors, industrial laser processing equipment, automated machine vision systems, and laboratory-grade scientific measuring instruments globally. Every industry field poses distinct working conditions, wavelength demands and environmental challenges, so customized optical substrate picking and functional coating matching become the core of stable product performance. For medical device optics such as endoscope lenses, medical display cover glass and detection optical windows, we select biocompatible optical glass, medical-grade fused silica or sapphire substrates, paired with customized AR/AG/AF composite coatings to guarantee high light transmittance, clear imaging and stain resistance under long-term sterile working environments. In rigorous aerospace systems exposed to drastic temperature fluctuation, high altitude pressure and UV radiation, high-hardness sapphire, high-temperature resistant fused silica and special infrared crystalline materials are prioritized. These raw materials cooperate with high-durability anti-abrasion optical coatings to withstand harsh outer-space ambient erosion and keep consistent optical transmission. Automotive optical sensors including LiDAR domes, automotive display protective glass and vehicle infrared sensing windows demand outstanding temperature shock resistance and anti-glare property. We configure BK7, sapphire and infrared crystalline materials alongside tailored functional coatings to adapt to outdoor temperature variation, sunlight irradiation and complex road operating environments. Industrial laser equipment optics including laser windows and focusing lenses mainly adopt high-purity fused silica, ZnSe and ZnS infrared crystals matched with laser anti-reflection coatings, lowering laser energy loss and improving laser transmission efficiency during continuous high-power laser operation. Machine vision optical lenses and protective windows for automated inspection need stable visible light transmission and anti-dazzle performance; we mostly deploy premium BK7 optical glass with professional AR or AG coating solutions to eliminate ambient light interference and boost detection accuracy for automated production lines. Various precision optical parts for scientific laboratory instruments use customized BK7, fused silica and infrared crystals with precision optical coatings, satisfying strict testing standards of spectral transmission and dimensional tolerance in scientific research scenarios. Targeted material selection plus personalized coating configuration according to specific application scenarios effectively maximizes light transmittance, optimizes optical stability and extends component service lifespan, enabling our optical parts to deliver reliable optimal performance across all above mainstream application fields.

Question 23

Felix Glass makes high-precision optical glass domes with tight tolerances, 10/5 scratch-dig quality, and ISO-certified performance.

Accepted Answer

At Felix Glass, quality and precision are the cornerstones of every optical glass dome we produce. We adhere to strict manufacturing and inspection standards to ensure your domes meet or exceed your specifications.**Dimensional Tolerances:**We achieve extremely tight tolerances on all critical parameters:- **Diameter Tolerance:** ±0.01 mm or better- **Thickness Tolerance:** ±0.005 mm- **Radius of Curvature Tolerance:** ±0.1% or better, depending on complexity- **Centration Error:** Less than 1 arc minute, ensuring perfect alignment- **Surface Irregularity:** λ/10 or better at 632.8 nm, for minimal wavefront distortionThese tight tolerances ensure that each dome is optically matched to your system, eliminating image aberration and ensuring consistent performance.**Surface Quality & Finish:**The surface quality of our domes is measured using the MIL-PRF-13830B scratch-dig standard. We routinely produce domes with:- Surface quality up to **10/5** (scratch/dig) for high-precision applications- Precision-polished surfaces with minimal roughness (Ra - Edge finishing options including fine grinding, chamfering, and polishing to eliminate stress pointsThis level of finish is critical for applications requiring high light transmission and low scatter.**Quality Assurance & Certifications:**All our manufacturing processes are conducted under an ISO 9001:2015 certified quality management system. Every optical glass dome undergoes a multi-point inspection before shipment, including:1.  Visual and interferometric inspection for surface defects2.  Dimensional verification using coordinate measuring machines (CMM)3.  Optical testing for transmission, reflection, and wavefront error4.  Coating performance verificationWe provide full inspection reports and certification upon request, giving you complete confidence in the quality and reliability of our products.At Felix Glass, we believe that true quality is built into every step of the process, from raw material selection to final testing.

Question 24

Felix Glass optical domes serve surveillance, underwater imaging, aerospace, machine vision and medical equipment, offering durable, distortion-free protection.

Accepted Answer

Our optical glass domes are engineered to meet the demanding needs of a diverse range of industries and applications where optical clarity, environmental protection, and structural integrity are non-negotiable.**1. Surveillance & Security Systems**Our domes are widely used in high-speed PTZ (pan-tilt-zoom) cameras, fixed surveillance cameras, and traffic monitoring systems. They protect sensitive camera lenses from dust, rain, vandalism, and extreme weather conditions while maintaining distortion-free, clear imaging across the entire field of view. Our anti-reflective and anti-fog coatings ensure optimal performance day and night.**2. Underwater Imaging & Marine Technology**Designed to withstand high water pressure, our domes are essential components for underwater cameras, remotely operated vehicles (ROVs), autonomous underwater vehicles (AUVs), and marine research equipment. Sapphire and high-grade BK7 domes offer superior pressure resistance and corrosion protection, delivering sharp, undistorted images even at significant depths.**3. Aerospace & Defense**For aircraft, satellites, drones, and defense systems, we manufacture high-precision optical domes for sensors, targeting systems, and navigation cameras. These domes must withstand extreme temperatures, vibration, and high altitudes. We use materials like sapphire and fused silica, combined with durable coatings, to ensure reliable performance in the harshest aerospace environments.**4. Industrial Machine Vision & Automation**In factory automation, quality control, and robotics, our domes protect vision system cameras and sensors from debris, oil, moisture, and high-temperature environments. Their high light transmission and low distortion ensure consistent, accurate imaging for inspection, measurement, and process monitoring tasks.**5. Medical & Life Sciences**We supply domes for medical imaging equipment, endoscopes, and diagnostic devices, where biocompatibility, optical clarity, and sterilization resistance are critical. Our sapphire domes, in particular, are ideal for reusable medical instruments due to their durability and chemical inertness.At Felix Glass, we don’t just sell domes; we provide application-specific solutions. Our team will work with you to understand your unique operating conditions and recommend the perfect optical glass dome solution for your project.

Question 25

Felix Glass provides custom optical glass domes with tailored sizes, curvature, and AR/IR/anti-fog coatings to match your exact requirements.

Accepted Answer

Absolutely. At Felix Glass, we specialize in custom optical glass domes tailored to your exact project requirements, from initial design to final delivery.**Custom Size & Geometry:**We manufacture domes in a wide range of sizes, from small miniature domes for compact sensors to large-diameter domes for industrial and aerospace applications. We can produce domes with custom:- Outer and inner diameters- Wall thicknesses (including uniform or tapered profiles)- Radii of curvature (both spherical and aspherical options)- Edge profiles (bevelled, flat, or threaded mounting surfaces)We can work directly from your CAD drawings or specifications, and our engineering team can also help refine your design for manufacturability and optimal optical performance.**Advanced Coating Options:**To maximize the performance of your custom optical glass dome, we offer a comprehensive range of thin-film coatings:- **Anti-Reflective (AR) Coatings:** Our multi-layer AR coatings significantly reduce surface reflection, boosting light transmission to over 99.5% across your target wavelength range (visible, NIR, SWIR). This eliminates glare, improves image clarity, and enhances the performance of your optical system.- **Infrared (IR) Coatings:** For night vision, thermal imaging, and IR sensor applications, we offer high-transmission IR coatings optimized for specific wavelength bands.- **Diamond-Like Carbon (DLC) Coatings:** These ultra-hard coatings provide excellent scratch and chemical resistance, ideal for domes used in harsh, high-abrasion environments.- **Anti-Fog & Hydrophobic Coatings:** These coatings repel water, prevent fogging, and make the dome surface easier to clean, perfect for outdoor surveillance and underwater applications.- **Custom Filter Coatings:** We can also apply custom bandpass, notch, or neutral density filters integrated directly onto the dome surface for specialized optical systems.Whether you need a one-off prototype or a high-volume production run, we ensure every custom optical glass dome meets our strict quality standards and your precise specifications.

Question 26

At Felix Glass, our optical glass domes adopt premium BK7/K9 glass, sapphire and fused silica. Each material is selected for high transmittance, durability and environmental resistance.

Accepted Answer

At Felix Glass, we manufacture optical glass domes using three primary high-performance materials, each chosen for its unique optical and mechanical properties:1.  **BK7 / K9 Optical Glass**    This is our most widely used material for standard optical glass domes. BK7/K9 offers exceptional visible light transmission (over 91% across the visible spectrum), low thermal expansion, and excellent homogeneity. It is ideal for applications such as surveillance cameras, general industrial vision systems, and consumer optics where cost-effectiveness and reliable performance are key. We offer BK7/K9 domes in various grades, including fine annealed options to minimize stress-induced birefringence.2.  **Synthetic Sapphire**    Sapphire optical domes are the premium choice for demanding environments. With a Mohs hardness of 9, sapphire is nearly scratch-proof and offers superior resistance to high temperatures, chemicals, and abrasion. It provides excellent transmission from the UV to the IR spectrum, making it perfect for aerospace sensors, underwater cameras, high-temperature industrial systems, and medical equipment where durability is critical.3.  **Fused Silica (Quartz)**    Fused silica domes are selected for applications requiring superior UV transmission or extreme thermal stability. They exhibit very low thermal expansion, making them resistant to thermal shock, and offer excellent transmission down to deep UV wavelengths. This material is commonly used in UV imaging systems, high-power laser applications, and high-temperature industrial monitoring equipment.We don’t just supply materials—our engineering team will help you select the optimal material based on your specific wavelength requirements, operating environment, durability needs, and budget to ensure your optical glass dome performs reliably over its entire lifecycle.

Question 27

We provide detailed test reports and inspection certificates for all BK7 & K9 optical glass products.

Accepted Answer

Yes, at Felix Glass, we can provide detailed test reports for all BK7 and K9 optical glass products, giving you full visibility into the quality and performance of your order.Our test reports include comprehensive information about the parts, including dimensional specifications, surface quality inspection results, and optical performance test data.For standard optical glass parts, we provide a basic test report that includes dimensional verification, surface roughness measurement, and visible light transmittance testing.For custom or high-precision parts, we can provide more detailed reports that include additional test data such as flatness, parallelism, coating thickness, and environmental resistance.For coated optical glass parts, we provide specific coating test reports that include transmittance and reflectance data across the target wavelength range, coating thickness uniformity, and adhesion test results. These reports verify that the coating meets the specified requirements and will perform as expected in your application.All test reports are based on actual measurements taken during our quality control process using calibrated testing equipment such as spectrophotometers, interferometers, and coordinate measuring machines. The reports are signed and dated by our quality team, and include information about the test methods used and the applicable standards.If you have specific test requirements or need to comply with industry or customer standards, we can customize the test reports to include the required information.Providing test reports is part of our commitment to transparency and quality assurance. We want our customers to have full confidence in the quality and performance of our optical glass parts, and our detailed test reports help to achieve that.If you need test reports for your optical glass order, please let us know when placing your order, and our team will provide you with the required documentation.

Question 28

We follow strict quality control standards for all BK7 & K9 optical glass parts, from raw material to final delivery.

Accepted Answer

At Felix Glass, we follow strict quality control standards for all BK7 and K9 optical glass products to ensure consistent quality and reliable performance for our customers. Our quality control process covers every stage of production, from raw material inspection to final product testing.Our quality control standards are based on international specifications, including ISO and DIN standards for optical glass. Before production, all raw materials are inspected for optical and physical properties, including refractive index, dispersion, transmittance, and chemical composition, to ensure they meet the required specifications.During production, we conduct in-process inspections to monitor dimensional accuracy, surface quality, and processing consistency. This includes checking the size, shape, and flatness of the parts using precision measuring equipment such as coordinate measuring machines (CMM) and interferometers. We also inspect the surface finish of the parts to ensure they are free from scratches, pits, and other defects that could affect optical performance.After processing, all optical glass parts undergo a comprehensive final inspection, including dimensional verification, surface quality inspection, and optical performance testing. For coated parts, we also test the coating thickness, uniformity, adhesion, and transmittance/reflectance to ensure they meet the specified requirements.Our optical performance testing includes measuring the visible light transmittance, refractive index, and dispersion of the parts using spectrophotometers and refractometers. We also test the parts for resistance to environmental factors such as temperature and humidity to ensure they maintain their performance under different conditions.All our quality control processes are documented, and we provide detailed inspection reports with each order, including test results and specifications verification. This gives our customers full visibility into the quality of their products and ensures they meet the required standards.At Felix Glass, we are committed to delivering high-quality optical glass parts that meet or exceed our customers' expectations. Our strict quality control standards ensure that every product we manufacture is reliable, consistent, and fit for purpose. If you have specific quality requirements for your project, please contact our team for more information.

Question 29

We offer customized anti-reflective (AR) coating services for BK7 & K9 optical glass, including single-layer and multi-layer options.

Accepted Answer

At Felix Glass, we offer a comprehensive range of anti-reflective (AR) coating services for BK7 and K9 optical glass parts, tailored to meet the specific wavelength and performance requirements of your applications.Our AR coating services include both single-layer and multi-layer coatings for different spectrums, including visible light (VIS), near-infrared (NIR), and ultraviolet (UV). Single-layer AR coatings are designed for basic applications, providing a moderate reduction in surface reflection and a corresponding increase in light transmittance. Multi-layer AR coatings, on the other hand, are engineered for high-performance applications, offering significantly lower reflectivity and higher transmittance across a broader wavelength range.Our coating process is carried out in a clean room environment using advanced vacuum deposition equipment, ensuring consistent coating quality and uniformity across the entire surface of the optical glass parts. Before coating, all parts undergo a thorough cleaning process to remove contaminants and ensure optimal coating adhesion. After coating, each part is inspected for coating thickness, uniformity, and adhesion to ensure they meet our quality standards.The benefits of AR coating include increased light transmittance, reduced glare and reflection, improved contrast, and enhanced scratch resistance. For example, a multi-layer AR coating can increase the visible light transmittance of BK7 glass from around 91% to over 98%, making it ideal for applications such as camera lenses, microscope objectives, and optical windows.We can customize the AR coating specifications to match your exact requirements, including the target wavelength range, minimum transmittance, and maximum reflectance. Whether you need a standard coating for a common application or a custom coating for a specialized project, we can provide you with a solution that meets your needs.Our experienced engineering team will work with you to understand your application requirements and recommend the most suitable AR coating for your optical glass parts. We also provide coating test reports to verify the performance of the coated parts, giving you confidence in their quality and reliability.If you have any questions about our AR coating services or need help selecting the right coating for your project, please contact our sales team today.

Question 30

We offer full processing services for BK7 & K9 optical glass, including cutting, polishing, CNC machining and AR coating.

Accepted Answer

At Felix Glass, we provide a full range of processing services for BK7 and K9 optical glass, from initial material preparation to final product delivery, to meet the diverse needs of our customers.Our processing services start with material cutting, where we use precision diamond cutting equipment to cut BK7 and K9 glass into the required size and shape. This process ensures clean edges and minimal material waste, which is essential for maintaining the quality of the glass.Next, we offer surface grinding and polishing services. Surface grinding is used to achieve the required dimensional accuracy and flatness, while polishing is used to create a smooth, scratch-free surface with high optical clarity. We use both mechanical and chemical polishing techniques to achieve different surface finishes, depending on the application requirements.For parts that require complex shapes or precise features, we provide CNC machining services. Our CNC equipment can machine custom shapes, holes, and grooves in BK7 and K9 optical glass with high accuracy, making it suitable for specialized applications such as optical instruments and industrial equipment.We also offer anti-reflective (AR) coating services for optical glass parts. Our coating options include single-layer and multi-layer AR coatings for visible, near-infrared, and ultraviolet spectrums, tailored to your specific wavelength requirements. AR coating reduces surface reflection, improves light transmittance, and optimizes the optical performance of the parts.In addition to these core services, we also provide additional processing options such as edge blackening, beveling, and cleaning. Edge blackening is used to reduce stray light in optical systems, while beveling is used to reshape edges for safety and improved handling. All our processing services are carried out under strict quality control standards to ensure consistent quality.Whether you need basic processing for standard parts or advanced services for custom components, we can provide you with a one-stop solution. Our experienced engineering team will work with you to understand your requirements and recommend the most suitable processing services for your project.If you have specific processing requirements for your optical glass parts, please contact our sales team today for a customized solution.

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A specialist in precision optical glass with 19 years of experience, providing comprehensive, satisfying custom solutions.

A specialist in precision optical glass with 19 years of experience, providing comprehensive, satisfying custom solutions.