Borosilicate glass characteristics

Borosilicate glass has a very low coefficient of thermal expansion, only about one third of that of ordinary glass. This will reduce the influence caused by the temperature gradient stress, which will have stronger fracture resistance. Because of its very small shape deviation, it has become an indispensable material in telescopes and mirrors, and it can also be used to process high-level radioactive nuclear waste. Even if the temperature changes suddenly, the borosilicate glass is not easily broken. When broken, the high borosilicate glass will appear large cracks instead of being crushed into particles. At the same time, high borosilicate glass also has low dispersion and relatively low refractive index.

The linear expansion coefficient of borosilicate glass G3.3 is (3.3±0.1)×10-6/K, which is based on sodium oxide (Na2O), boron oxide (B2O3), and silicon dioxide (SIO2) as one of the basic components. Kind of glass. The borosilicate content in the glass composition is relatively high, namely boron: (12.5~13.5)%, silicon: (78~80)