Precision-fabricated quartzware engineered for thermal shock resistance (ΔT > 1100°C), minimal chemical outgassing, and long operational life under aggressive plasma and LPCVD process environments.
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High-Quality High-Temperature Oversized Fused Quartz Tube Factory in China - Leading Suppliers for Photovoltaics & Semiconductors Supplier, Product
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High-Quality Heat Resistant Fused Silica Quartz Plates from China Factory - High Purity Suppliers for Optical and Semiconductor Use Manufacturers, Product
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Wholesale Custom Size High-Purity Quartz Furnace Tubes for Laboratory & Industrial Use - China Suppliers & Factory Factory, Products
View Technical SpecsOver 70% of China's quartz refining and deep processing is centralized in Donghai County, Jiangsu Province. Lianyungang Southeast Quartz leverages this unique ecosystem to provide vertical material traceability, continuous raw crystal supply, and world-class price-performance ratios.
Our plant operates at the epicentre of silica sand beneficiation. With high-temperature chlorination, magnetic separation, and ultra-sonic acid-leaching plants adjacent to our factory, we source raw sand with SiO₂ purity ≥ 99.998% with zero logistical delays.
Complete supply chain density eliminates international sub-tier transportation costs. From raw cylinder drawing, continuous furnace electric melting, and rotary mold fusing to 5-axis CNC ultrasonic cold machining, every step occurs within a 15-kilometer radius.
Donghai houses the highest density of certified master glassblowers in Asia. We combine decades-honed flame hand-finishing for complex semiconductor manifolds with programmable automated lathes capable of welding Ø600mm oversized quartz reactor bodies.
Selecting the optimum silica grade requires balancing mechanical creep at elevated temperatures against optical transmission and trace metallic thresholds. Natural fused quartz provides superior structural rigidity at >1100°C due to natural aluminum dopant networks.
| Property / Specification Parameter | High-Purity Natural Fused Quartz (Donghai) | Synthetic Fused Silica (CVD/Soot) | Industrial Borosilicate Glass (Reference) |
|---|---|---|---|
| Raw Material Precursor | Purified Pegmatitic Crystal Sand (SiO₂) | Silicon Tetrachloride (SiCl₄) vapor synthesis | Silica, Soda, Alumina & Boric Oxide |
| Purity Level (Trace Elements) | ≥ 99.995% to 99.999% (< 15 ppm total impurities) | ≥ 99.9999% (< 0.1 ppm transition metals) | Commercial glass quality (~80% SiO₂) |
| Viscosity / Sag Resistance (1200°C) | Superior (Al³⁺ ions crosslink network, high sag resistance) | Moderate (prone to deformation under high wafer payload) | Complete structural melt down (< 600°C) |
| Hydroxyl (OH⁻) Concentration | Typically < 5 ppm to 30 ppm (Low bubble expansion) | High (600 - 1000 ppm) or Water-free dry synthetic | Not applicable |
| Coefficient of Thermal Expansion (CTE) | 5.5 × 10⁻⁷ / K (20°C to 320°C) | 5.0 × 10⁻⁷ / K | 33 × 10⁻⁷ / K (Severe thermal shock risk) |
| Softening Point (°C) | ~ 1,683°C | ~ 1,600°C | ~ 820°C |
| Primary Target Application | Diffusion furnace tubes, solar boats, bell jars, crucibles | EUV photomasks, excimer laser optics, fiber core | Laboratory sight glasses, chemical beakers |
Synthetic quartz exhibits low OH stability which softens noticeably at 1050°C. Natural fused quartz contains native trace Aluminum (Al³⁺: ~10-18 ppm) embedded into the crystal tetrahedral lattice. This natural doping structurally inhibits viscous sliding, allowing heavy 12-inch 300mm wafer boats to maintain slot pitch tolerances without sagging over thousands of thermal cycles.
Devitrification (conversion of metastable fused silica to cristobalite crystalline phase) causes micro-cracking during cool-down. Southeast Quartz strictly minimizes alkaline mobile ions (Na⁺, K⁺, Li⁺ < 2 ppm), raising the threshold where phase transition occurs and tripling the usable campaign life of furnace liners.
As semiconductor nodes shrink to gate-all-around (GAA) architectures and photovoltaics universally transition to TOPCon and Perovskite-Tandem cells, quartzware specifications have transitioned from conventional dimensional glass to high-precision engineering ceramics.
Modern advanced semiconductor fabs demand total heavy metal contamination below 0.1 ppb in carrier quartz. Southeast Quartz integrates cleanroom Class 100 ultrasonic washing stations with high-temperature halogen gas annealing furnaces to bake out interstitial volatile species.
The photovoltaic industry has migrated from PERC to N-type TOPCon, necessitating high-temperature boron and POCl₃ diffusion at >1150°C. This requires oversized quartz process tubes (Ø ≥ 450mm) capable of supporting large 182mm/210mm wafer payloads without mechanical sag.
Instead of manual flame reshaping, modern quartz components require 5-axis CNC diamond tooling directly milling from stress-annealed plasma-fused quartz blocks. This guarantees absolute geometric repeatability, tight notch tolerances, and zero microscopic thermal microcracking.
Where standard glass fails immediately and metals cross-contaminate high-purity processes, fused natural quartz operates as the irreplaceable core substrate.
Used inside horizontal and vertical atmospheric furnaces for wet/dry gate oxide growth and high-temperature dopant drive-in. Fused quartz furnace tubes, end caps, and gas distribution manifolds maintain vacuum integrity and isolate wafers from heating coils.
In Atomic Layer Deposition and RTP chambers, quartz bell jars and windows allow direct penetration of high-intensity infrared radiation (0.8 μm to 2.5 μm) while sealing volatile precursor chemistry (TMA, ozone, silane) under sub-Torr pressures.
Fused quartz plates with double-side optical polishing (60/40 or 40/20 scratch/dig) offer broad transmission extending from 220 nm in the deep UV to 3500 nm in the near-IR, serving as debris shields in laser welding and flow cells for chromatographic analysis.
Halogen infrared emitter tubes utilize heavy-wall quartz sheaths and custom heat-resistant quartz lamp holders. These resist continuous filament temperatures exceeding 2200°C while directing directed thermal vectors onto automotive coatings and composite prepregs.
Global supply chain directors require guaranteed capacity, duplicate tooling protection, certified raw material lots, and risk-free transit. Southeast Quartz implements a structured 4-stage engineering onboarding process for worldwide accounts.
We audit step files, DWG drawings, and geometric dimensioning & tolerancing (GD&T). Our metallurgical engineers analyze operating atmosphere, thermal cycling ramp rates, and fitment with graphite/SiC mating hardware.
Prior to flame welding or 5-axis slotting, components undergo finite element thermal stress modeling. We establish specific cooling curves and program automated annealing cycles to eliminate residual hoop stresses.
All enclosed quartz apparatus, double-jacketed tubes, and bubbler bottles are subjected to helium mass-spectrometry leak evaluation down to 10⁻⁹ mbar·L/s, preventing lethal pyrophoric chemical or silane atmosphere leaks.
Following high-purity ultrasonic HF acid etching and deionized water rinsing (>18 MΩ·cm), parts are heat-sealed inside multi-layer anti-static clean bags and crated within custom-molded shock-absorbing EPE crates.
Authoritative metallurgical and operational guidance addressing high-temperature performance, dimensional tolerances, handling protocols, and custom factory production capabilities.
To provide a definitive DFM review and quotation within 24 hours, our engineering department requires: detailed 2D/3D CAD models (PDF, DWG, or STEP format) specifying inner/outer diameter (ID/OD), wall thickness, and overall length; required tolerance limits (±0.1mm standard or ±0.02mm precision); ground joint or flange specifications; peak continuous process temperature; process chemistry (chlorine, fluorine, ozone, hydrogen); and annual batch volume requirements.
High-purity transparent natural fused quartz supports continuous steady-state operation at 1,100°C and intermittent excursions up to 1,250°C. The strain point is approximately 1,075°C, annealing point is 1,180°C, and softening occurs near 1,683°C. Continuous operation above 1,150°C without mechanical bracing should be evaluated for thermal sag based on tube diameter, wall thickness, and unsupported span.
Devitrification is accelerated by alkaline contamination (specifically Na, K, Ca ions acting as crystallization seeds) at temperatures >1000°C. We prevent this by ensuring raw material purity (<2.5 ppm total alkali) and conducting final HF pickling. End-users must enforce cleanroom glove handling protocols; skin fingerprints deposit sufficient sodium chloride to trigger rapid localized cristobalite crystallization and subsequent thermal shock cracking.
For standard extruded and flame-polished tubing, outer diameter tolerances are held within ±0.5% to ±1.0% of nominal OD, with wall thickness variation ≤10%. For CNC cold-machined plates, rings, and slotted semiconductor boats, we hold linear dimensions to ±0.02 mm, wafer slot pitch to ±0.015 mm, flatness to 1–2 optical fringes per inch, and surface roughness down to Ra 0.05 μm upon request.
Yes. Southeast Quartz operates dedicated large-diameter horizontal and vertical centrifugal fusing machinery capable of drawing oversized quartz furnace tubes and reaction liners with outer diameters ranging up to Ø600mm, wall thicknesses from 3.0mm to 12.0mm, and continuous lengths up to 3,500mm, with custom welded end flanges and ground ball joints.
Every sealed or double-wall quartz assembly undergoes helium mass-spectrometry leak detection with a test sensitivity limit of 1×10⁻⁹ mbar·L/s. Furthermore, polariscope optical strain viewers are used to inspect welded joints for residual birefringence/stress fields, ensuring thorough stress relief before packing.
Explore our drawing-based custom fused quartz rods, precision wafer carriers, high-temperature furnace tubes, and insulating rings available for immediate production and global fulfillment.
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