Grades and common conditions of colored optical glass

China Nonferrous Metals optical glass The first letter of the Chinese phonetic alphabet is used to indicate the brand name of the optical glass. One or two letters in front of the brand name indicate the color (such as HB, ZWB, respectively, represent red glass and UV glass) or characteristics (such as FB, which represents protective glass) of the optical glass. The letter behind the brand name is “B”, which represents the optical glass. The number in the lower right corner of the letter “B” indicates the serial number of colored optical glass.