Overview
Calcined quartz is produced by heating natural quartz at high temperatures (typically 800–1200°C) to eliminate organic impurities and structural water. This process enhances its thermal and chemical stability, making it ideal for demanding industrial applications. Unlike raw quartz, calcined quartz exhibits reduced porosity and improved mechanical strength. It is widely preferred in sectors requiring high-purity silica, such as advanced ceramics and semiconductor manufacturing.
Physical and Chemical Properties
Calcined quartz retains the fundamental properties of silica (SiO₂) but with optimized characteristics due to thermal treatment. It has a Mohs hardness of 7 and maintains its crystalline structure up to 573°C, beyond which it transitions to beta-quartz. Its low coefficient of thermal expansion (0.5 × 10⁻⁶/K) and high dielectric strength make it valuable in electronics. The material is chemically inert, resisting acids (except HF) and alkalis, and does not react with most metals or gases.
Main Applications
In ceramics, calcined quartz acts as a flux to reduce firing temperatures and improve product density. It is a key raw material for porcelain, sanitaryware, and technical ceramics. The electronics industry uses it for silicon wafers, crucibles, and insulating components. Other applications include refractory linings, optical fibers, and abrasives. Its UV transparency also benefits solar panel coatings and specialty glass.
Safety and Storage
While calcined quartz is non-hazardous, airborne dust can irritate respiratory systems. Use N95 masks and ensure proper ventilation during handling. Store in sealed containers to prevent moisture absorption, which may affect performance in sensitive applications. Disposal follows general silica waste guidelines. Avoid mixing with reactive chemicals, though its inert nature minimizes risks of dangerous reactions.
B2B Procurement Guide
Buyers should prioritize suppliers offering certified purity levels (e.g., 99.5% or 99.9% SiO₂) and consistent particle size distribution. Bulk purchases (20+ tons) often qualify for discounted rates. Test reports for trace elements (Fe, Al, Na) are critical for electronics-grade quartz. Consider logistics: moisture-resistant packaging and reliable freight partners ensure product integrity during transit.
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