... g/100gH2O.18°C)0.27Cleavage Plane-100Density(g/cm³)2.639Melting Point(°C)870 Beijing Glass Research Institute is the ... FIBER AND DEVICES(PMF, PMC, Infrared fiber, cold light guide)2.COMMUNICATION OPTICAL FIBER;3.OPTICAL PROCESSING AND OPTICAL FILM( Optical ... HR, PR, BBAR, IR, UV filter) 4.SYNTHETIC CRYSTAL(Fluoride Optical Crystal ;Fluoride Scintillation Crystal);5.SPECIAL GLASSES(Special glass used in ...