High Purity Quartz[2]
Overview
High Purity Quartz (HPQ) is a specialized form of silicon dioxide with a minimum purity of 99.9%, often exceeding 99.99% for critical applications. It is derived from select natural quartz deposits or synthesized via advanced processing to remove impurities like iron, aluminum, and alkali metals. Unlike standard quartz, HPQ exhibits exceptional optical clarity, thermal shock resistance, and electrical insulation properties. Its production involves multi-stage purification techniques including flotation, acid leaching, and high-temperature chlorination to achieve parts-per-million impurity levels.
Physical and Chemical Properties
HPQ has a Mohs hardness of 7 and a low coefficient of thermal expansion (5.5×10⁻⁷/°C), making it ideal for high-temperature environments. Its UV transparency extends to 170 nm, outperforming most optical materials. Chemically inert to most acids (except HF) and alkalis, HPQ maintains stability up to 1,000°C in oxidizing atmospheres. The material’s dielectric constant (3.8 at 1 MHz) and volume resistivity (>10¹⁶ Ω·cm) are crucial for electronics applications.
Main Applications
In semiconductors, HPQ is used for crucibles (Czochralski process) and wafer carriers due to its non-contaminating properties. Solar-grade HPQ is essential for manufacturing high-efficiency photovoltaic cells with minimal light-induced degradation. The fiber optics industry relies on HPQ for preforms and cladding tubes, where even ppm-level impurities can cause signal attenuation. Other uses include high-intensity UV lighting (e.g., excimer lamps), precision lab equipment, and advanced ceramics.
Safety and Storage
While HPQ is non-hazardous per GHS classification, fine powders require dust control measures (local exhaust ventilation) to prevent respiratory irritation. Bulk material should be stored in moisture-proof packaging to avoid caking. For high-temperature applications, gradual heating/cooling protocols are recommended to prevent microcracking. Process waste containing HPQ can typically be disposed of as inert material, though regional regulations may apply for nano-sized particles.
B2B Procurement Guide
Key specifications include SiO₂ content (4N to 5N grade), trace element profiles (especially <5 ppm for transition metals), and particle morphology (angular vs. spherical). Suppliers should provide ICP-OES/MS certification with batch-specific data. For optical applications, request UV-VIS transmission spectra. Consider logistical factors: some producers offer pre-washed/classified grades to reduce processing steps. Minimum order quantities often start at 1 ton for standard grades, with lead times of 4–8 weeks for custom formulations.
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