Good quality quartz glass material , high accurate , many sizes

Quartz glass chemical, physical properties: 1. Quartz glass consists mainly of silica (SiO2), content of 99.99%. Other impurity is infinitesimal, impurities total content of no more than 100 PPM. 2. Quartz glass resistance ability of nitrate than lead resistance ability of nitrate is 10000 times higher, resistance to sulfate resistance ability than lead sulfate is 1000 times higher ability. Quartz glass chemical stability than acid enamel 30 times greater; Nickel chrome steel and ceramic than 150 times (HF and HPO). 3. Quartz glass softening temperature 1730 °C, using temperature 1200 °C. Coefficient of expansion: at normal temperature for 5 x 10-7 / °C, is all metal, nonmetal in the smallest