Dull Polishing Quartz plate is a special glass that contains High purity  silicon dioxide .
Colorful Mineral Product Company dull polishing  quartz glass board mask is made from natural quartz after the process of melting and fine grinding.It is  colorless, contains no air bubble and no processing line footprint will be found . Its Silicon Dioxide   is controlled to the grade of  PPM. It has the great performance such as Low heat expansion rate, high temperature resistance  , chemical stability , perfect insulation, stable ultrasonic delay , best spectrum and  to be  an ideal materials in the field of high technology such as space technology, atomic energy industry ,national defense outfit, automatic system, semiconductor, metallurgy, chemical, electric lighting, communication, light industry and building materials.