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What are the key advantages of BK7/K9 optical glass?

Update Time:2026/4/28

BK7 and K9 optical glass are the most popular choices in the optical industry, thanks to a range of key advantages that make them suitable for countless applications worldwide.

First and foremost, they feature excellent optical clarity with a visible light transmittance of over 91%, which ensures that light passes through the material with minimal loss. This high transmittance is critical for applications such as camera lenses, microscope objectives, telescope eyepieces and other optical instruments, where clear and undistorted images are essential. Whether you are designing a consumer camera or a high-precision scientific instrument, BK7 and K9 optical glass can provide the optical clarity you need.

Second, BK7 and K9 optical glass have stable physical and chemical properties. They have a low thermal expansion coefficient, which means they do not expand or contract significantly with changes in temperature. This stability ensures consistent optical performance even in varying environmental conditions, making them suitable for both indoor and outdoor applications. They also have excellent chemical resistance, which protects them from corrosion and degradation caused by exposure to moisture, acids and other environmental factors. This durability ensures that your optical components will maintain their performance over a long service life.

Third, BK7 and K9 optical glass are highly machinable. They can be easily cut, ground, polished, drilled and coated to meet custom design requirements. This versatility allows manufacturers to produce a wide range of optical components, from simple flat windows and spherical lenses to precision prisms. Their good machinability also means that they can be produced in large quantities with consistent quality, making them a cost-effective choice for mass production projects.

Fourth, BK7 and K9 optical glass are cost-effective compared to other high-performance optical materials. While they offer excellent optical performance, they are more affordable than many specialized optical glasses, making them accessible to a wide range of applications, from consumer electronics to industrial equipment. This cost-effectiveness, combined with their reliable performance, makes them the preferred choice for many optical designers and manufacturers.

Finally, BK7 and K9 optical glass have a long history of use in the optical industry, which means their properties and performance are well understood and widely accepted. This established track record gives designers and manufacturers confidence in their suitability for various applications.

Our factory provides high-quality BK7 and K9 optical glass parts with customized processing services, including cutting, polishing, coating and CNC machining, to meet your specific application needs. Whether you need standard components or custom-designed optical parts, we can deliver products that meet your exact specifications.

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James Fu, Sales Director of FELIX OPTICAL GLASS, and a poster displaying contact information for an optical glass deep-processing factory.

James Fu, Sales Director of FELIX OPTICAL GLASS, and a poster displaying contact information for an optical glass deep-processing factory. 2

Learn more from our FAQ

What is the minimum order quantity for custom precision optical glass components?: FELIX OPTICAL GLASS offers highly flexible MOQs to support customer projects, including prototype testing, small-batch trial orders, and high-volume production. All products can be fully customized to your drawings, tolerances, and application standards. Please send us your specifications, and we will reply within 1-5 hours and provide an accurate quotation after careful evaluation within 1-2 days.

Can I get free glass samples for testing before bulk order?: Yes, our FELIX GLASS factory supports sample testing for a wide range of precision optical glass components and assemblies. The lead time for sample production is 3 to 7 working days. Please contact us today to arrange samples and obtain a customized solution that meets your needs.

What is the production lead time for custom optical glass components?: A: The production cycle for standard samples is 3-10 working days, while mass production requires 15-35 working days, depending on the complexity of the product and the order quantity. We provide reliable precision optical glass components and fast delivery services for orders from industries such as defense, industrial equipment, medical devices, shipbuilding, robotics, automotive, and aerospace. Please submit your project details so we can provide you with an accurate delivery schedule.

Are your optical glass products ISO, CE and RoHS certified?: All precision optical glass components from FELIX OPTICAL GLASS comply with ISO quality system standards as well as CE and RoHS requirements. We provide comprehensive test reports, spectral graphs, material certificates, and inspection documents for customer review. Please feel free to request complete certification details and a formal quotation at any time.

Do you offer one-stop custom optical glass processing services?: Yes. We offer a full range of precision optical glass component processing services, including CNC machining, precision grinding, optical polishing, chemical/physical tempering, vacuum coating (AR anti-reflective coating, AF anti-fingerprint coating, AG anti-glare coating, IR infrared coating), and screen printing. From raw materials to finished products, every step is completed in our own factory. Please tell us your needs, and we will provide you with the most cost-effective solution.

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With 19 years of experience as a precision optical glass expert, we provide comprehensive and satisfactory customized solutions.

✔ROHS CE certified ISO9001:2005 quality management system
✔Professional team over 19 years’ experience under Japanese management system
✔Help over 2000+ companies to make prototypes into mass production successfully
✔Challenge the 100% on time delivery goal 100% full inspection report
✔Cost-down solutions for over 2000+ companies with success
✔Free solutions provided based on different industries
✔Support free samples (quick sample production) Small quantity (100-1000pcs) available

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