... to customer requirementColor:clearQuality: K9,BaK7,ZK3,ZK7,ZK9,B270 Our optical glass is lead-free, arsenic-free, cadmium-free, low-density ... panel and so on. Performance parameters of our crown optical glass Glass typendudnF-nCH-K9L1.5168064.200.008050H-ZK31.5891361.250.009618H ... -ZK91.6204160.340.010281H-ZK111.6385455.450.011516 optical glass block for optical instrument