Explore our top-tier catalog of specialized fused silica apparatus engineered for continuous operation at temperatures up to 1,150°C and peak surges exceeding 1,300°C without devitrification or structural deformation.
Across international research institutions, multi-gigawatt photovoltaic cell manufacturing lines, and semiconductor cleanrooms, transparent fused quartz has evolved from an empirical glassware substitute into a strategic engineered substrate.
Unlike standard borosilicate 3.3 glass that fractures under steep thermal gradients, high-purity laboratory quartz exhibits a near-zero coefficient of thermal expansion (CTE ≈ 5.5 × 10⁻⁷/K). This enables direct water quenching from 1,100°C without crack propagation, making it essential for rapid thermal processing (RTP) and furnace tube reactions.
Optical clarity across the spectral band from 190 nm (deep ultraviolet) through 2,500 nm (near-infrared) ensures minimal beam attenuation (>90% internal transmittance). This optical grade fused silica performance is foundational for spectrophotometric absorption cells, UV photolysis reactors, and laser inspection windows.
Consisting of ≥ 99.99% amorphous silicon dioxide (SiO₂), industrial quartzware resists aggressive acids, halogens, and organic solvents (excluding hydrofluoric and hot phosphoric acid). It prevents metal ion leaching (Fe, Cu, Ni, Na, K) into ultra-pure analytical mixtures, preserving baseline fidelity in ICP-MS and chromatography.
Headquartered in Donghai County, Jiangsu — the undisputed capital of China's quartz and silicon manufacturing ecosystem — Southeast Quartz operates inside a densely integrated raw-material and manufacturing network. This spatial consolidation delivers an unrivaled competitive edge to international procurement directors.
Traditional Western and Japanese fabricators face lengthy supply chain buffers and soaring labor rates for glassblowers. In contrast, our Donghai fabrication hub combines deep domestic supplies of natural silica sand and synthetic precursor silicon tetrachloride (SiCl₄) with high-capacity continuous plasma fusion and precision CNC diamond grinding.
The net outcome is a 35% to 55% direct cost optimization on bespoke furnace tubes, slotted wafer carriers, and custom quartz apparatus, alongside expedited lead times: rapid 48-hour turnarounds for engineering schematics and standard prototype shipments within 7 to 10 working days.
Selecting the ideal glass substrate requires analyzing thermal expansion, annealing limits, hydroxyl content (OH⁻), and trace metal impurities. The table below outlines empirical benchmarks critical for engineering validation.
| Physical / Chemical Property | High-Purity Fused Quartz (Natural) | Synthetic Fused Silica (EUV Grade) | Borosilicate Glass 3.3 |
|---|---|---|---|
| Chemical Composition | SiO₂ ≥ 99.99% | SiO₂ ≥ 99.9999% (Synthetic) | 81% SiO₂, 13% B₂O₃, 4% Na₂O/K₂O |
| Maximum Working Temp (Continuous) | 1,100 °C - 1,150 °C | 1,200 °C - 1,250 °C | 450 °C - 500 °C |
| Softening Point (°C) | 1,683 °C | 1,730 °C | 825 °C |
| Coefficient of Thermal Expansion (CTE) | 5.5 × 10⁻⁷ / K (20°C - 320°C) | 5.0 × 10⁻⁷ / K | 33 × 10⁻⁷ / K |
| Dielectric Strength (kV/mm at 20°C) | 25 - 40 kV/mm | 40 - 50 kV/mm | 10 - 15 kV/mm |
| Optical Transmission Range | 220 nm – 2,500 nm | 185 nm – 2,600 nm (Deep UV) | 310 nm – 2,200 nm (Cuts UV) |
| Devitrification Threshold | ≥ 1,150 °C (requires alkali-free surface) | ≥ 1,250 °C | Softens & slumps before devitrifying |
| Hydroxyl (OH⁻) Concentration | < 5 ppm to 30 ppm (Flame/Arc Fused) | < 1 ppm (Dry) to 1,200 ppm (Wet) | N/A (Complex alkali borosilicate) |
High-purity quartzware serves as the silent enabler across advanced engineering and scientific disciplines where thermal instability, dielectric breakdown, or chemical trace contamination cannot be tolerated.
Diffusion tubes, LPCVD reaction chambers, source bubblers, and vertical quartz boats holding 150mm to 300mm silicon wafers during doping and thermal oxidation without introducing heavy metal contamination.
Oversized quartz furnace tubes and single-crystal pulling crucibles optimized for high-throughput TOPCon and Heterojunction (HJT) silicon wafer phosphorus oxychloride (POCl₃) liquid source diffusion.
Microchannel spectrophotometer flow cells, microwave digestion vessels, round-bottom boiling flasks, and reflux distillation apparatus that resist thermal shock and strong organic acids.
Plasma-fused ingots wire-sawn and polished into high-energy UV laser windows, viewports for ultra-high vacuum (UHV) chambers, and IR heating lamp jackets with specialized reflective back-coatings.
Tier-1 engineering buyers and OEM purchasers require stringent compliance with geometrical and chemical purity matrices. Devitrification—the transition of metastable amorphous fused silica into crystalline cristobalite—accelerates at temperatures above 1,150°C whenever trace alkali metals (Li, Na, K) or airborne dust settle onto the quartzware surface.
To counter premature component degradation, Southeast Quartz guarantees:
The laboratory and industrial quartz glass market is undergoing a structural transition driven by sub-3nm chip nodes, next-generation solar cells, and micro-reaction biotechnology:
As extreme ultraviolet (EUV) lithography and excimer lasers expand, synthetic quartz synthesized from gas-phase silicon precursors is replacing natural quartz where metallic impurities must be under 0.1 ppb.
Laser-induced deep etching (LIDE) on optical quartz plates enables high-aspect-ratio capillary channels for in-situ DNA sequencing, electrophoresis, and single-molecule fluorescence detection.
The shift toward larger wafer formats (M10/G12) requires massive quartz furnace tubes reaching diameters up to 450 mm to 650 mm, demanding advanced horizontal pulling and stress-annealing capabilities.
Direct technical guidance covering thermal thresholds, devitrification mitigation, helium leak criteria, and fabrication feasibility for process engineers and procurement teams.
Standard high-purity clear fused quartz operates continuously at up to 1,100°C–1,150°C under an inert or reducing atmosphere. It can sustain brief thermal peaks up to 1,300°C–1,350°C without dimensional deformation. The actual deformation point (softening point) is roughly 1,683°C. For continuous operation above 1,150°C, structural wall thickness must be engineered to prevent sag under gravity.
Devitrification happens when surface contaminants—especially alkali salts (Na, K, Ca) from fingerprints or dust—act as nucleation sites for cristobalite crystal growth above 1,100°C. To prevent clouding, clean all quartzware in a 5% to 10% hydrofluoric (HF) acid bath, rinse thoroughly with deionized (DI) water (resistivity > 18 MΩ·cm), air-dry under laminar cleanroom airflow, and handle strictly using lint-free, powderless nitrile gloves.
While often used interchangeably, "Fused Quartz" typically denotes material melted from naturally occurring high-purity quartz crystal rock (SiO₂ ≥ 99.99%), making it ideal for diffusion furnace tubes, bell jars, and thermal apparatus. "Synthetic Fused Silica" is synthesized via chemical vapor deposition of silicon halides (SiCl₄), yielding exceptional purity (SiO₂ ≥ 99.9999%), near-zero trace metals, and high deep-UV transmission (down to 185 nm) for excimer lasers and optical lithography.
For cold CNC machining (plates, discs, rings, ground joints), standard tolerances are ±0.05 mm, with precision-grade machining reaching ±0.01 mm upon request. For flame-worked hot glassblowing (oversized furnace tubes, welded flanges, 3-port bubblers), standard outer diameter (OD) tolerance is within ±0.5% of the nominal dimension, and overall length is within ±1.0 mm to ±2.0 mm, conforming to international DIN ISO 2768-m standards.
Every pressure-bearing or vacuum-rated quartz vessel—including flanged CVD tubes, bubblers, and reactor bell jars—undergoes vacuum testing using a calibrated helium mass-spectrometer leak detector. Parts must demonstrate a helium leak rate below 1.0 × 10⁻⁹ mbar·l/s before clean packaging, ensuring absolute hermetic stability for low-pressure chemical vapor deposition (LPCVD) and molecular beam epitaxy (MBE).
To receive a verified engineering review within 24 hours, provide your dimensional drawing in 2D (PDF / DWG) and 3D (STEP / IGES) formats, specifying: (1) Inside/outside diameter and wall thickness, (2) Operating temperature and thermal profile, (3) Process gas chemistry, (4) Joint and flange types (KF/NW, ConFlat, ground ball/socket, or custom O-ring grooves), and (5) Batch quantity.
Explore our heavy-duty process tubes, high-temperature diffusion carriers, and factory-direct fused silica assemblies designed for continuous semiconductor cleanrooms and industrial furnace lines.
Our senior glassblowing masters and CNC application engineers review CAD, DWG, and STEP files within 24 hours. We evaluate manufacturability, recommend optimal thermal wall ratios, and confirm material purity certificates before fabrication.
Facility: Lianyungang Southeast Quartz Products Co., Ltd.
Location: No. 1 Qingsheng Rd., Qinghu Industrial Park, Donghai County, Jiangsu, China 222300
Direct Sales: +86 135-8528-2520 / +86 135-8528-6180
Engineering Email: [email protected] / [email protected]
