Basic introduction of borosilicate glass

Borosilicate glass, also known as borosilicate glass, refers to the glass whose basic components are SiO2, B2O3, and Na2O. The basic composition range is: ω (SiO2)=70%~80%, ω (B2O3)=6%~ 15%, ω(Na2O)=4%~10%, ω(Al2O3)=0~5%, ω(BaO)=0~2%, ω(CaO)=0~2%. Studies have shown that Na2O provides free oxygen, which transforms boron-oxygen triangle [BO3] into boron-oxygen tetrahedron [BO4]. The structure of boron changes from layered to frame-like, creating conditions for B2O3 and SiO2 to form a uniform glass; B2O3 enters the glass structure with [BO3] or [BO4], especially when it is combined with [BO4] and [SiO2] to form a structural network, which increases the integrity and compactness of the network. Therefore, borosilicate glass has many excellent properties. Performance: such as good thermal stability, chemical stability, mechanical properties, process properties and optical properties [1].

Compared with ordinary glass, borosilicate glass is obviously superior to the former in terms of thermal, optical, mechanical and chemical properties. Because borosilicate glass contains higher SiO2 and B2O3, its thermal expansion coefficient is lower than that of ordinary glass. It also has high thermal shock resistance and high surface hardness, can prevent scratches, and can be used in fire and bulletproof glass.

The production process requires uniform mixing and precise processing technology, which makes it significantly better than ordinary glass in terms of light transmittance, surface flatness and fluorescence performance. It is also very prominent in terms of acid resistance, alkali resistance and hydrolysis, especially for glass surfaces. The borosilicate glass will not cause crack expansion due to the action of water molecules in the moist air. It is widely used in electrophoresis, optics, photonics and optoelectronics.