Glass tube is a kind of non-metallic tube. It is a kind of glass with sodium oxide (Na2O), boron oxide (B2O3) and silicon dioxide (SiO2) as the basic components. Its good performance has been widely recognized by all walks of life in the world. Compared with ordinary glass, it has no harmful side effects. Its mechanical properties, thermal stability, water resistance, alkali resistance and acid resistance are greatly improved. It can be widely used in chemical industry, aerospace, military, family, hospital and other fields, and has good promotion value and social benefits, The appearance of this kind of glass in China is another new revolution in the basic material industry.
The linear expansion coefficient of g3.3 high borosilicate glass is 3.3 ± 0.1 × 10-6 / K is a kind of glass with sodium oxide (Na2O), boron oxide (B2O3) and silicon dioxide (SiO2) as basic components. The content of boron and silicon in the glass is high, which are boron: 12.5 ~ 13.5%, silicon: 78 ~ 80%, so this kind of glass is called high boron and silicon glass. It belongs to Pyrex glass in borosilicate glass. Acid, alkali and water resistance, excellent corrosion resistance, good thermal stability, chemical stability and electrical performance, so it has the characteristics of chemical corrosion resistance, thermal shock resistance, good mechanical performance and high temperature resistance.