... , acid, alkali, anti-high pressure. This company produces of 3.3 high borosilicate glass, with a good appearance, high temperature, resistance strong pressure ... complete. This company produces steel of 3.3 borosilicate glass sight glasses 1.7,2.0,3.0,3.3,4.0,5.0,6.0 ... stability:T300 ° CLinear expansion coefficient (0-300 ° C): 3.3 ×10-7 K-1Softening temperature:820°C high borosilicate Glass