What does E4 on car glass mean?

[LeJeremiah]

E4 represents production in the Netherlands. Below are relevant details: 1. Origin: The E mark originates from regulations (Regulation) issued by the Economic Commission for Europe (ECE). Currently, ECE includes 28 European countries, encompassing not only EU member states but also non-EU nations in Eastern and Southern Europe. ECE regulations are recommended for use by member states and are not mandatory standards. Member countries can adopt ECE regulations or continue using their own national regulations. 2. Market acceptance: Typically, ECE member states are willing to accept test reports and certificates that comply with ECE regulations. E mark certification covers products that are components and system parts. Products that obtain E mark certification are market-accepted. Common E mark certified products in China include automotive bulbs, safety glass, tires, warning triangles, and automotive electronic products.

[OColin]

I specifically looked up relevant information, and the E4 marking on car glass is actually a certification mark from the European Economic Commission. To be precise, the number 4 represents the Dutch certification body. Every time I see this mark in the corner of my windshield, I know this piece of glass complies with EU safety standards. It’s not just randomly printed—it means the glass has undergone rigorous testing for impact resistance, light transmittance, and other aspects. I recall that different numbers represent different countries, for example, E1 is German certification. This marking is particularly important for used car buyers; they should carefully check whether all windows have complete certification, as missing marks could affect safety. Additionally, here’s a lesser-known fact: some glass exported from China also bears the E4 mark to meet export standards.

[EvanFitz]

As someone who frequently pays attention to automotive safety, I've particularly noticed these symbols in the corners of glass. The E4 clearly indicates that this piece of glass has passed Dutch safety certification, and the entire E-prefix series adheres to unified EU standards. The glass must meet criteria such as 70% light transmittance and the ability to withstand high-speed stone impacts to obtain this certification. Once, while helping a friend choose a used car, I specifically taught him to check if the E4 mark was intact, and we discovered that the rear window glass was an uncertified aftermarket part. My advice to everyone is: when replacing glass, don't just look at the price—make sure it has the E4 or corresponding national standard certification, as it directly relates to driving safety.

[SimonLynn]

The E4 marking on car glass is an EU safety certification symbol, with the number 4 specifically indicating approval by Dutch authorities. It is completely different from the DOT marking found in the lower corner of windshields, which represents U.S. standards. I've noticed experienced drivers pay special attention to this marking, especially when replacing glass—panes without certification often fail to meet light transmission requirements. European vehicles commonly display codes ranging from E1 to E43, with E4 representing the most active testing agency in the Netherlands. Incidentally, high-quality domestic glass now often carries dual certification, meeting both Chinese national standards and EU export requirements.

[ElainaAnn]

Just studied the glass certification issue. Simply put, E4 is the EU safety mark recognized by the Netherlands. When I recently had my car's windshield replaced, the repair shop technician specifically reminded me to look for this certification. It ensures the glass meets three critical requirements: fragments won't scatter and cause injury upon breakage, no cracking under extreme temperature differences, and nighttime light transmission won't impair visibility. Note that some low-cost aftermarket parts may counterfeit this mark - authenticity can be verified by checking the factory number next to the certification. It's recommended to inspect these certification marks for integrity during annual car washes.