What are the markings on car glass?
2 Answers
There are several types of markings on car glass: National Safety Certification Mark: Automotive safety glass is a product subject to mandatory national certification in China, so every piece of glass on a car should bear the national safety certification mark, commonly known as the "Square and Circle Mark". This is the most common and important marking on car glass. Foreign Certification Marks: Such as the U.S. "DOT" mark or the European ECE "E" mark, indicating that the product has also been certified by these foreign certification bodies and can be exported abroad. Of course, some companies obtain foreign certifications merely to demonstrate that their product quality meets "national standards". Automaker Identification: Generally, glass manufacturers will print the automaker's logo, trademark, or company name on the glass as per the automaker's request. Glass Manufacturer Identification: Glass manufacturers will print their own trademarks or company abbreviations on the glass they produce, such as "FY" for Fuyao Automotive Glass.
I discovered that the markings on car windows are crucial—they’re like hidden codes revealing safety information. The most common is the DOT number, which stands for the U.S. Department of Transportation certification code, ensuring the glass meets shatter-resistant standards. There are also AS or ASM markings indicating safety glass, which reduces injury risks upon impact. European models often feature an E-mark, such as E1 for German approval. Another key detail is the production date code: small dots or letters denote the year and month—for example, dots on the right represent the month, while those on the left indicate the year. These markings aren’t just factory imprints; they also matter for insurance claims—if certification marks are missing, glass breakage in an accident might not be covered. During maintenance, take a moment to check if the markings are legible; clean or replace the glass if they’re faded. Overall, understanding these markings enhances driving safety and helps avoid substandard glass.
