What are the characteristics of high borosilicate glass?

         High borosilicate glass has a very low coefficient of thermal expansion, only about one third of that of ordinary glass. This will reduce the effects of stress due to temperature gradients, resulting in greater resistance to fracture. Due to its very small deviation in shape, it is an indispensable material in telescopes, mirrors, and it can also be used to dispose of highly radioactive nuclear waste. Even if the temperature changes suddenly, borosilicate glass is not easy to break. When broken, borosilicate glass exhibits large cracks instead of breaking into particles. At the same time, borosilicate glass also has low dispersion and relatively low refractive index.

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