1. The amount of boron trioxide and silicon dioxide contained in high borosilicate glass is higher than that in ordinary glass

2, the silicon content of ordinary flat glass is about 70%, and ordinary glass generally does not add boron.

Boron glass has low expansion coefficient, high softening point and good resistance to acute cooling and heat

High borosilicate glass has the advantages of high hardness, high strength, high heat resistance, high light transmittance, and is often used to make 4 pieces of telescope mirror, microwave oven turntable, and other glass products with special requirements for temperature and transparency.