Comprehensive technical specification, material chemistry comparison, and manufacturing insights for procurement managers and design engineers.
When advanced optical, semiconductor, and thermal process engineers specify transparent viewing windows, thermal shields, or carrier substrates, the transparent quartz glass plate stands as the uncompromising industry standard. Chemically composed of nearly pure silicon dioxide (>99.99% SiO2), fused quartz is synthesized through the melting of ultra-pure natural quartz crystals at temperatures exceeding 2000°C. Unlike conventional borosilicate or soda-lime glass, transparent quartz exhibits an amorphous non-crystalline lattice that gives it singular optical, chemical, and physical characteristics.
The standout feature of a transparent quartz glass plate is its remarkably low coefficient of thermal expansion (α ≈ 5.5 × 10-7 / K between 20°C and 1000°C). This tiny thermal expansion coefficient makes quartz plates virtually impervious to thermal shock. A typical 3.0 mm polished quartz plate can be heated to 1100°C in an industrial furnace and instantaneously plunged into ice-cold water without micro-fracturing, structural warping, or tensile shattering. At Kavri Quartz Product Co., Ltd., our transparent quartz glass plates are precision-annealed to permanently eliminate internal mechanical stress, guaranteeing structural dimensional stability under cycling vacuum, cryogenic, or high-pressure environments.
From the deep ultraviolet spectrum (UV-C at 185 nm–260 nm) through the visible light spectrum (400–700 nm) to the near-infrared band (up to 3.5 µm), transparent quartz plates achieve internal light transmission rates between 90% and 93% across the entire spectrum.
Fused quartz plates are chemically inert against virtually all acids (including aggressive boiling nitric, sulfuric, and hydrochloric acids) except hydrofluoric and hot concentrated phosphoric acid, preventing process contamination in cleanrooms.
With exceptional dielectric strength (25–40 kV/mm) and minimal high-frequency dielectric loss, quartz plates serve as premier electrical isolators in high-voltage plasma chambers and RF sputtering systems.
Procuring international engineers frequently inquire about the distinctions among the primary optical fused silica classifications. Selecting the correct grade balances optical performance and manufacturing cost:
| Material Grade | Synthesis Method | Spectral Transmission | OH Concentration | Primary Industrial Applications |
|---|---|---|---|---|
| JGS1 (Far UV Grade) | Synthetic chemical vapor deposition (SiCl4) | 185 nm – 2500 nm (deep UV transparent) | High (typ. 800 – 1200 ppm) | UV lithography, excimer laser optics, biochemical analyzers, fluorescence spectroscopy. |
| JGS2 (Optical Grade) | Fused quartz from natural high-purity crystalline quartz | 220 nm – 2500 nm (standard UV & VIS) | Medium (typ. 100 – 200 ppm) | Industrial sight glasses, precision optical windows, UV disinfection reactors, solar wafer carriers. |
| JGS3 (Infrared Grade) | Vacuum electric melting of pure natural quartz | 260 nm – 3500 nm (free of 2.73 µm OH band) | Ultra-low (< 5 ppm) | Infrared heating windows, FTIR spectroscopy, thermal imaging pyrometers, furnace viewing ports. |
Explore our premium factory-manufactured transparent quartz glass plates, custom-cut discs, polished substrates, and high-temperature viewing windows.
Optical grade JGS2 clear fused quartz plates polished to 60/40 or 40/20 surface quality. Exceptional transmission up to 92% across VIS-NIR spectrum with chamfered safe edges.
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Designed for industrial vacuum chambers, boilers, and continuous heating kilns up to 1100°C. High thermal shock threshold with custom stepped edge joints.
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Precision CNC diamond-milled circular quartz discs tailored for semiconductor wafer processing, etching chambers, optical pyrometry windows, and laser protective shields.
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Zero-bubble synthetic fused silica plates engineered for high-power laser optics, UV disinfection reactors, biochemistry flow cells, and photolithography aligners.
View Product DetailsUnderstanding shifting procurement dynamics, technical fabrication demands, and technological advancements in fused quartz manufacturing.
1. Shift Toward Direct Sourcing from Raw Material Clusters: Global B2B procurement leaders are increasingly shifting away from domestic distributors to partner directly with tier-one factories based in historic raw material production centers, such as Donghai, Lianyungang. Sourcing directly bypasses intermediaries, compresses lead times by 30–45%, and ensures verifiable material lineage from crystal batch to finished optical plate.
2. Heightened Purity and Bubble-Free Tolerances: With the acceleration of sub-nanometer semiconductor packaging, compound semiconductors (SiC, GaN), and advanced microfluidics, global buyers are enforcing tighter acceptance criteria for quartz plates, requiring bubble class 0 (per DIN 58927) and extreme surface flatness tolerances below λ/4.
3. Comprehensive Custom CNC Integration: Procurement requirements have progressed beyond standard square or circular blanks. Today's orders mandate ready-to-mount components with precision countersunk holes, laser edge bevelling, chamfered steps, and internal micro-channels manufactured via 5-axis CNC wet grinding.
1. Next-Generation UV-C Disinfection & Lithography: The expansion of deep-ultraviolet LED disinfection and EUV/DUV lithography demands JGS1 synthetic silica with virtually nonexistent hydroxyl (OH) absorption artifacts and ultra-high solarization resistance under prolonged high-energy radiation.
2. Advanced Chemical Mechanical Planarization (CMP): Surface polishing has evolved from basic diamond slurry lapping to sub-nanometer CMP. This achieves surface roughness Ra < 0.3 nm, which is essential to minimize scatter loss in ultra-fast laser windows and aerospace optical sensors.
3. Green Synthesis & Energy Optimization: Manufacturing fused quartz requires immense thermal energy. Forward-looking manufacturers like Kavri Quartz are modernizing electric fusion furnaces with closed-loop computerized temperature controls, reducing carbon footprints while tightening thermal homogeneity across large glass ingots.
Kavri Quartz Product Co., Ltd. is a highly professional, verified manufacturer and exporter of transparent quartz glass plates, fused quartz tubes, laboratory quartz instruments, infrared heat lamps, and halogen lamps in China. Located in Donghai Town, Lianyungang City, Jiangsu Province — globally celebrated as China's premier capital of crystal and quartz processing — we leverage unmatched regional advantages in natural quartz mineral reserves, advanced raw silica refinement, and specialized master glass-working craftsmanship.
With over 10 years of OEM/ODM manufacturing expertise and 13 years of verified presence on Alibaba.com, we maintain a prompt buyer response rate of 92.65% with technical quotes delivered within ≤ 4 hours. Our products are exported worldwide to Germany, the Netherlands, Japan, Korea, the USA, and beyond, providing precision tolerances, competitive factory-direct pricing, and dependable engineering support.
In-depth technical answers addressing the key questions global buyers, QA engineers, and procurement managers ask about transparent quartz glass plates.
Partner directly with Donghai's leading fused quartz manufacturer. Share your CAD drawings, dimensional specifications, or optical requirements — our engineering team will provide a factory-direct technical quote within 4 hours.