The main component of ordinary water bottle is silicon dioxide, which is an amorphous inorganic non-metallic material. Generally, it is mainly composed of a variety of inorganic minerals, such as: quartz sand, borax, boric acid, barite, barium carbonate, limestone, often Soda ash, etc., and a small amount of auxiliary raw materials are added.
High borosilicate water bottle is a kind of glass with enhanced fire resistance. On the basis of ordinary glass, 12.5~13.5% boron is added. During the manufacturing process, it is also necessary to add glaze water glass sand, soda water and lime. The strain temperature of pyrex water bottle can reach 520℃, and the strength is also higher.
Compared with ordinary glass, it has a lower thermal expansion coefficient: (3.3±0.1)×10-6/K, which is only about 1/3 of ordinary glass. That is, the deformation is smaller after being heated, so it is less likely to break after being heated and cooled. In addition, water resistance, alkali resistance, acid resistance and other properties are much stronger than ordinary glass. Of course, it does not mean that high borosilicate glass will not be broken by heat, but compared with ordinary glass, pyrex water bottle is not so easy to break.
The insulating tile of the space shuttle is also coated with high borosilicate glass, which shows how strong the high borosilicate glass is. It is also because the performance is better than ordinary glass water bottle in all aspects, so the price is higher.
