Buyer's Guide: How to Read the Certification Marks on Glass

Created on 10.20

Certification marks on glass are the “pass” that lets products enter a target market. Knowing how to read these marks on arrival is the buyer’s first step to confirming whether a product is compliant and legally sellable.

When glass leaves the factory, certification marks are etched or printed in a corner. They prove the glass has passed the relevant safety certification and can be traced back to a specific production plant if quality issues arise. If the marks are unclear, incomplete, randomly placed, or simply missing, the product may not have gone through proper certification — putting it at risk of customs detention or market inspection.

1. E-Mark (ECE R43) Mark

Used in the EU and the 50+ countries that recognize this regulation. The mark is a circle containing the letter "E" plus a country code: E1 for Germany, E2 France, E3 Italy, E4 the Netherlands, E11 the UK, E13 Luxembourg. It is followed by a certification number (e.g. E1-43R-00xxxx) and a glass type code.

Check three things: the circle is complete, the letter and country code are clear, and the 43R reference is present. Glass bound for Europe, the Middle East, Southeast Asia and similar markets generally must carry the E-Mark.

2. DOT Mark

Used in the United States. The mark shows "DOT" followed by a manufacturer code (e.g. DOT-1007). Under the manufacturer self-certification model for FMVSS 205, the mark itself does not mean third-party audit — but the code corresponds to a registered production plant. Buyers can use the code to confirm the supplier's qualification and request supporting documentation when needed.

3. CCC Mark

Used in China. The glass must carry the standard CCC mark followed by a factory code (e.g. E003315). Any automotive glass sold on the Chinese market must bear a complete, clear CCC mark — a hard requirement for market access.

4. JIS Mark

Used in Japan. The glass must carry the JIS mark (the JIS symbol with the Japanese certification mark), together with the standard number JIS R 3211 (Safety Glazing Materials for Road Vehicles) and a factory code. The JIS mark is a basic threshold for glass entering the Japanese market; check that the JIS symbol is complete and that the standard year is current.

Beyond certification marks, glass commonly shows a glass type code (T for tempered, L or LAM for laminated), thickness specification (e.g. 5 mm, or 5+0.76+5 to describe a laminated build), and a production date batch. These help you quickly confirm that the product matches your order specifications.

How to check on arrival? First, look: the marks must be complete and clear, usually in a corner of the glass. Second, match: confirm the certification number and factory code agree with the supplier’s certificates. Third, keep: take photos for records, as the basis for later traceability and any claim.

At CMET, the certification mark on every piece of glass matches the documents we hold: China CCC-E003315, EU E1-43R, US DOT-1007 and Japan JIS R 3211. If you have any questions about the marks on glass you receive, or need to verify our certification documents, feel free to contact us.

Contact

Leave your information and we will contact you.

Buyer's Guide: How to Read the Certification Marks on Glass

Company

Collections

About

Follow us