Top Trusted Fused Silica Ingot Factories & Supplier

Fused quartz ingots are produced by electrically fusing or flame-melting naturally occurring high-purity crystalline silica sand (SiO₂ ≥ 99.99%). This material provides outstanding mechanical robustness, high thermal resistance (up to 1100°C continuous, 1683°C softening point), and minimal cost, making it ideal for furnace tubes, wafer handling boats, and chemical crucibles. Synthetic fused silica is synthesized through the vapor-phase flame hydrolysis or plasma CVD of high-purity chemical precursors like silicon tetrachloride (SiCl₄). This results in virtually zero metallic impurities (purity > 99.9999%), absence of bubbles, superior transmission in the deep ultraviolet spectrum (down to 193 nm), and near-zero laser-induced damage, making it the preferred substrate for semiconductor photomasks and laser optics.

Hydroxyl groups bound into the silica network act as structural defect terminations. High [OH⁻] concentrations (e.g., 800–1200 ppm in Type III silica) reduce the glass viscosity, lower the annealing point by roughly 80°C–100°C, and create an intense infrared absorption peak around 2.73 µm. Conversely, low-hydroxyl "dry" fused quartz (electrically melted, [OH⁻] < 5–20 ppm) delivers higher thermal stability, enhanced creep resistance at 1150°C, and broad infrared transmission out to 3.5 µm. For high-temperature diffusion tubes and vacuum furnaces, low [OH⁻] material is mandatory to avoid structural sag and wall deflation.

We grade fused silica ingots and cut plates in accordance with DIN 58927, ISO 12123, and semiconductor SEMI specifications. Our optical and semiconductor grades achieve Class 0 (zero bubbles or inclusions > 0.05 mm across the functional clear aperture). Standard industrial and furnace grades comply with Class 1 or Class 2 standards, where total bubble cross-section area is strictly capped beneath 0.10 mm² per 100 cm³ of glass, ensuring that mechanical strength and thermal stress fields remain completely stable under cycling.

Standard fused quartz transmits radiation across the far ultraviolet spectrum, including the 184.9 nm mercury emission line, which photodissociates atmospheric oxygen (O₂) into highly reactive ground-state oxygen radicals that generate ozone (O₃). In enclosed cleanrooms or unprotected factory environments, ozone is hazardous to personnel and corrodes machinery. "Ozone-free" fused silica is lightly doped with precise trace elements (such as Titanium) during the ingot melt, which induces a steep cutoff absorbing wavelengths below 220 nm while maintaining near 90% transmission at 253.7 nm for germicidal UV or curing applications.

Yes. We operate a full-service custom fabrication department capable of processing buyer engineering files in PDF, DXF, DWG, STEP, and IGES formats. Our in-house technical capabilities include precision diamond core drilling, ultrasonic slotting, CNC five-axis milling, optical surface polishing (down to λ/10 and Ra ≤ 0.2 nm), hot flame lathe bending, closed-dome sealing, and acid etching. Prototyping starts with a minimum order quantity (MOQ) of just 1 piece to allow physical validation before committing to mass production.

Industrial quartz and fused silica are prone to catastrophic brittle shear if subjected to vibration shock or point-load pressure. Each finished component undergoes ultrasonic multi-stage DI water cleaning, is dried, and vacuum-sealed in cleanroom polyethylene bags. Components are nested within high-density expanded polyethylene (EPE) custom-cut foam cavities, encased in multi-wall shock-resistant inner cartons, and secured within ISPM-15 compliant export plywood crates with built-in corner bracing. Shipments are fully insured and prepared for international courier, air cargo, or ocean transport.