Φ80, room temperature ~1800℃ quartz visible window
　　Quartz is a special industrial technology glass made of silica, which is a very good basic material. Quartz sheet has a series of excellent physical and chemical properties, such as:
　　1. It has the high temperature resistance. The softening point temperature of quartz glass is about 1730℃, which can be used at 1100℃ for a long time, and the temperature of short time use can reach 1450℃.
　　2. It has the corrosion resistance. In addition to hydrofluoric acid, quartz glass almost does not react with other acids, and its acid resistance is 30 times that of ceramics, 150 times that of stainless steel, especially its chemical stability at high temperatures, which is unmatched by any other engineering materials.
　　3. It has the good thermal stability. Adapt to the glass thermal expansion coefficient is very small, can withstand drastic temperature changes, quartz glass heated to about 1100℃, into normal temperature water will not burst.
　　4. It has good light transmission performance. The quartz sheet has good light transmission performance in the entire spectral band from ultraviolet to infrared, and the visible light transmittance is more than 93%, especially in the ultraviolet spectral region, the transmittance can reach more than 80%.