Boron-silicon glass (also known as hard glass) is characterized by utilizing the conductive properties of glass at high temperatures. Glass melting is achieved by heating inside the glass, and is processed by advanced production technology. The coefficient of thermal expansion of the wire is (3.3 ± 0.1). ) × 10-6/K, also known as "borosilicate glass 3.3". It is a special glass material with low expansion rate, high temperature resistance, high strength, high hardness, high light transmittance and high chemical stability. Due to its excellent performance, it is widely used in solar energy, chemical industry, pharmaceutical packaging and electric light sources. , craft jewelry and other industries. Its good performance has been widely recognized by all walks of life in the world, especially in the solar energy field. The developed countries such as Germany and the United States have already carried out more extensive promotion.