... produces of 3.3 high borosilicate glass, with a good appearance, high temperature, resistance strong pressure, acid and alkali, high transparency, good quality, ... complete. This company produces steel of 3.3 borosilicate glass sight glasses 1.7,2.0,3.0,3 ... test 40Kgf/cm ²Thermal stability:T300 ° CLinear expansion coefficient (0-300 ° C): 3.3 ×10-7 K-1Softening temperature:820°C high borosilicate Glass ...