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Q7: How to recognize the etched side?

Q: Q7: How to recognize the etched side?

Question: How to recognize the etched side?Answer:Recognizing the etched (AG/anti-glare) side of optical glass is crucial for quality control and application matching. Here are 3 practical and high-precision methods: 1. Visual Light Reflection Test (Most Used)Place the glass under natural light or fluorescent lamps. Observe the light reflection on both sides: the etched side will produce diffuse reflection, with blurred and scattered light (matte, non-glare effect); the non-etched side will form a clear, mirror-like specular reflection of the light source. This method is the most convenient and widely used in on-site inspection, with 100% accuracy for standard AG glass.2. Tactile Touch TestGently slide your finger across the glass surface. The etched side has a matte, slightly rough texture (smooth and non-sticky hand feeling), while the non-etched side is smooth and flat. Note: This method is not suitable for AF-coated glass, as the AF layer will change the surface touch feeling.3. Backlighting Transparency TestHold the glass up to a strong light source and observe from the opposite side. The etched side shows a frosted, semi-opaque matte effect, while the non-etched side is fully transparent. This method is especially effective for high-haze AG glass, making it easy to distinguish even for thick glass. In summary, the visual light reflection test is the first choice for quick identification, and it can be combined with the tactile test for double verification. Our AG optical glass undergoes strict process control, ensuring clear distinction between etched and non-etched sides and stable product performance.

Update Time:2026/4/2

Question: How to recognize the etched side?

Answer:

Recognizing the etched (AG/anti-glare) side of optical glass is crucial for quality control and application matching. Here are 3 practical and high-precision methods:

1. Visual Light Reflection Test (Most Used)

Place the glass under natural light or fluorescent lamps. Observe the light reflection on both sides: the etched side will produce diffuse reflection, with blurred and scattered light (matte, non-glare effect); the non-etched side will form a clear, mirror-like specular reflection of the light source. This method is the most convenient and widely used in on-site inspection, with 100% accuracy for standard AG glass.

2. Tactile Touch Test

Gently slide your finger across the glass surface. The etched side has a matte, slightly rough texture (smooth and non-sticky hand feeling), while the non-etched side is smooth and flat. Note: This method is not suitable for AF-coated glass, as the AF layer will change the surface touch feeling.

3. Backlighting Transparency Test

Hold the glass up to a strong light source and observe from the opposite side. The etched side shows a frosted, semi-opaque matte effect, while the non-etched side is fully transparent. This method is especially effective for high-haze AG glass, making it easy to distinguish even for thick glass.

In summary, the visual light reflection test is the first choice for quick identification, and it can be combined with the tactile test for double verification. Our AG optical glass undergoes strict process control, ensuring clear distinction between etched and non-etched sides and stable product performance.

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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.

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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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