... produces of 3.3 high borosilicate glass, with a good appearance, high temperature, resistance strong pressure, acid and alkali, high transparency, good quality, After cutting, grinding ... , polishing, milling,Tempered and so on process to complete. This company produces steel of 3.3 borosilicate glass ... C): 3.3 ×10-7 K-1Softening temperature:820°C high borosilicate Glass