Optical glass:divides colored optical glass and uncolored optical glass. colored optical glass divides phosphate glass, silicate glass. Uses the selective absorption glass of the ND glass by selenium cadmium coloration, the ion coloration. The silicate glass is more stability than the phosphate glass to the moist atmospheric action performance, according to the user use different situation, may perform vacuum coated (It doesn¡¯t need bloom generally) Widely applies in the colleges and institutes, the scientific research develops and forms war industry, the public security punishment detects, the medical instrument, the finance and so on.