Quartz Glass | Crystal Quartz, Fused Silica & Synthetic Fused Silica Guides
This category clarifies three quartz material types, their optical & thermal differences, thermal shock performance and application limits for furnace viewports and UV optics. Crystal quartz is single-crystal α-SiO₂ with birefringent optical properties and directional mechanical strength. Unlike amorphous fused silica, crystalline quartz undergoes a sharp phase change at 573°C, which creates critical thermal stress risks for high-temperature furnace windows, laser waveplates and thermal instrumentation parts. Felix Glass strictly controls heating/cooling cycles to avoid cracking caused by solid-state phase inversion. Crystal quartz is preferred for birefringent optical elements such as waveplates and polarizers. For high-temperature viewports with frequent thermal cycling, synthetic fused silica is a better alternative because it has no phase transition and maintains stable mechanical performance up to 1100°C without abrupt volume change. Fused silica (natural fused quartz) is melted from natural quartz ore, while synthetic fused silica is produced via gas-phase hydrolysis of SiCl₄ with ultra-high chemical purity. The two materials share nearly identical thermal expansion coefficients and mechanical properties, but differ sharply in UV transmittance, impurity levels and OH absorption bands, which directly determines their suitability for deep-UV laser optics, semiconductor lithography and UV spectroscopy windows. 1. Deep-UV laser (193 nm / 248 nm), UV spectroscopy: select synthetic fused silica (JGS1), specify low metal impurity content and transmission at target UV wavelength.
2. UVC germicidal lamp windows, 254 nm UV applications: choose high-OH synthetic fused silica for low cost while maintaining UVC transmission.
3. Visible light optics, furnace viewports, near-infrared observation windows: natural fused silica (JGS2) fully meets requirements and controls material cost.
4. Broadband UV–IR transmission without infrared absorption: specify low-OH dry synthetic fused silica with OH content below 1 ppm. Related categories: Sapphire Optics, Optical Materials We supply crystal quartz, natural fused silica and ultra-pure synthetic fused silica components, including ultra-precision polishing, AR coating, edge chamfering and strict spectral transmission inspection for UV lasers, furnace viewports and optical instruments.Quartz Glass
Technical Articles In This Category
Crystal Quartz: High-Temperature Mechanical Performance
Overview
Core Risk: α–β Phase Transition at 573°C
High-Temperature Mechanical Strength Degradation
Mechanical Parameter Specifications for RFQ
Typical Applications & Material Substitution Advice
Fused Silica & Synthetic Fused Silica Optical Differences
Overview
Raw Material & Purity Gap
Spectral Transmission Comparison (10 mm thickness)
Laser Damage Threshold & Homogeneity
Grade Selection Guide for Engineering Drawings
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Custom Quartz Glass Machining & Polishing
