What Is Quartz Wafer? A Quartz Wafer is a circular wafer-shaped substrate manufactured from high-purity fused quartz / fused silica (SiO₂). It offers excellent optical transmission, thermal stability, low thermal expansion, electrical insulation, and chemical resistance. Quartz wafers can be precision processed according to customer requirements, including dicing, edge finishing, grinding, single-side polishing, double-side polishing, drilling, slotting, and other customized