Engineered from premium Donghai natural and synthetic SiO₂ reserves. Each batch features continuous temperature resistance up to 1,100°C, high dielectric strength, and optical-grade purity designed for strict North American manufacturing criteria.
Headquartered in Donghai County, Jiangsu Province—the global epicentre of high-purity natural silica reserves and crystal processing—Southeast Quartz manages the entire manufacturing chain from raw purification to micron-level 5-axis CNC diamond tooling.
We leverage continuous electric-arc fusion and high-temperature plasma-arc melting processes to transform SiO₂ feedstock into ingots exceeding 99.995% to 99.999% (5N) purity. This eliminates micro-bubbles, structural inclusions, and structural striae right at the ingot casting phase.
Cold-working facilities feature high-speed ultrasonic drilling, waterjet profiled slicing, and CNC contour milling capable of holding outer diameter tolerances within ±0.05 mm. Finished tubes undergo multi-axis hydrogen-oxygen fire glazing for supreme surface integrity.
Every quartz tube production run includes multi-stage chemical etching with semiconductor-grade HF/HNO₃ acid baths, deionized water cascading rinsing (18.2 MΩ·cm), and cleanroom dual-layer vacuum packaging ensuring zero particulate contamination upon delivery to US fabs.
Procuring wholesale quartzware from Southeast Quartz provides American equipment integrators and facility maintenance engineers with complete tariff transparency, DDP door-to-door delivery, and comprehensive ASTM/SEMI quality documentation.
Fully compliant with ASTM C623 (elastic moduli), ASTM E438 Type I Class A (laboratory glass), and SEMI Standard F21-95 specifications regarding trace elemental metal contamination in semiconductor wet chemical and furnace operations.
Turnkey Delivered Duty Paid (DDP) shipping covering US Customs clearance, Section 301 tariff management, customs bonding, and direct freight to manufacturing facilities throughout California, Texas, Oregon, Arizona, and Ohio.
To safeguard large-bore furnace tubes up to Ø600 mm, each shipment is crated inside ISPM-15 export-certified timber with inner high-density floating EPE shock suspensions, monitored by Drop-N-Tell and Tip-N-Tell impact indicators.
Our dedicated international engineering sales group aligns directly with US Eastern (EST) and Pacific (PST) operational windows, ensuring CAD/STEP file reviews, quotation turnaround, and design adjustments are delivered within 24 hours.
In high-temperature thermal diffusion and plasma environments, microscopic impurities dictate component longevity, devitrification velocity, and wafer contamination rates. Below is our typical ICP-MS element impurity profile and thermomechanical baseline.
| Trace Element | Aluminium (Al) | Iron (Fe) | Calcium (Ca) | Magnesium (Mg) | Sodium (Na) | Potassium (K) | Lithium (Li) | Titanium (Ti) | Hydroxyl (OH⁻) |
|---|---|---|---|---|---|---|---|---|---|
| Standard Grade (PPM) | 14.0 - 18.0 | 0.2 - 0.5 | 0.4 - 0.8 | 0.1 - 0.2 | 0.8 - 1.2 | 0.6 - 1.0 | 0.3 - 0.6 | 1.0 - 1.5 | < 30 ppm |
| High-Purity 5N Grade (PPM) | < 6.0 | < 0.08 | < 0.3 | < 0.05 | < 0.2 | < 0.2 | < 0.1 | < 0.8 | < 5 ppm (Dehydroxylated) |
| Ultra-Purity Synthetic Grade (PPB) | < 15 ppb | < 10 ppb | < 20 ppb | < 5 ppb | < 10 ppb | < 10 ppb | < 2 ppb | < 10 ppb | Custom < 1 ppm |
| Property Parameter | Metric Value | US Customary / Imperial Value | Standard Test Reference |
|---|---|---|---|
| Density (20°C) | 2.20 × 10³ kg/m³ | 0.0795 lb/in³ | ASTM C693 |
| Coefficient of Thermal Expansion (CTE, 20-1000°C) | 5.5 × 10⁻⁷ K⁻¹ | 0.306 × 10⁻⁶ in/(in·°F) | ASTM E228 |
| Strain Point / Annealing Point | 1,075°C / 1,215°C | 1,967°F / 2,219°F | ASTM C336 |
| Softening Point | 1,683°C | 3,061°F | ASTM C338 |
| Dielectric Strength (20°C, 1 MHz) | 25 - 40 kV/mm | 635 - 1016 V/mil | ASTM D149 |
| Thermal Shock Resistance (ΔT) | Instantaneous 1,100°C to 20°C water quenching without fracture | Instantaneous 2,012°F to 68°F quench | Internal Factory Standard |
From Tier-1 wafer fabrication fabs across Arizona, Texas, and Oregon to cutting-edge Department of Energy (DoE) research centers, fused quartz is the critical baseline material for extreme environments.
Horizontal and vertical LPCVD, thermal oxidation, gate dielectric growth, and diffusion furnaces (ASM, TEL, Kokusai equipment fits). Our oversized tubes deliver zero warp and superior gas tightness under harsh halogen/hydride chemistry.
Large-scale tubular reactors for boron and phosphorus diffusion in TOPCon, HJT, and tandem perovskite cell manufacturing. Engineered to sustain prolonged high thermal cycles with extended devitrification resistance.
Substrate cladding tubes, handle rods, and synthesis reaction chambers for low-water-peak optical preform production, maintaining optical transmittance exceeding 92% across the ultraviolet (185-260 nm) and infrared spectra.
Precision vacuum chambers, sight windows, and high-energy laser envelopes for DoE national laboratories, DARPA research contractors, and university aerospace engineering centers studying plasma containment and hypersonic heating.
The shift toward sub-2nm Gate-All-Around (GAA) semiconductors, extreme ultraviolet (EUV) optical pellicles, and massive renewable solar expansion is reshaping what North American procurement directors demand from wholesale quartz manufacturers.
US fab managers look beyond purchase price to Total Cost of Ownership (TCO). A tube with uniform wall thickness (concentricity error <0.1 mm) prevents localized hot spots, lowering cycle sagging rates and extending furnace tube MTBF from 180 to over 320 thermal cycles.
Next-gen M10/G12 solar wafer sizes and 300mm wafer batch LPCVD processing mandate large-diameter quartz tubes up to Ø650 mm OD. Southeast Quartz has scaled hot-drawing vertical lathes and annealing chambers to eliminate thermal stress in oversized geometries.
As processing temperatures surpass 1,200°C in radical thermal processes, hydroxyl content (OH) accelerates thermal deformation and bubble expansion. Advanced high-vacuum thermal baking techniques lower OH levels below 5 ppm, maximizing structural rigidity.
Engineered solutions, thermal parameters, shipping protocols, and factory direct customization guidance for North American procurement officers.
Standard dimensional quartz tubes (OD 10 mm to 200 mm) ship from stock within 5-7 business days. Custom CNC-machined tubes, flanged furnace tubes, or oversized quartz tubes take approximately 12-18 business days. For USA deliveries, sea freight takes 14-22 days to West Coast ports (Long Beach/Oakland) and 24-28 days to East Coast ports, with expedited air cargo (FedEx/DHL/custom air charter) taking only 3-5 days for urgent fab maintenance.
We employ a custom 4-layer shock-absorption crating system. Each quartz tube is wrapped in anti-static PE film, encased in expanded polyethylene (EPE) custom foam saddles, placed inside reinforced double-wall inner containers, and suspended within heavy-duty ISPM-15 export plywood crates. All crates carry 3M Drop-N-Tell impact and tilt sensors to verify shock-free transit.
Our transparent fused quartz tubes sustain continuous operation at 1,100°C (2,012°F) and can handle short-term exposure up to 1,250°C (2,282°F) under protective or inert atmospheres. The transformation point is 1,075°C, and the softening point is 1,683°C. For operations continuously above 1,150°C, we advise dehydroxylated low-OH material (<5 ppm OH) to minimize sagging.
Every production lot is accompanied by a Certificate of Conformance (CoC), an ICP-MS Chemical Impurity Assay Report, a Dimensional Inspection Report verifying outer diameter, inner diameter, wall thickness, and runout tolerances, and an ISO 9001:2015 / RoHS / REACH compliance declaration. Helium mass-spectrometry vacuum leak test certificates (<1×10⁻⁹ mbar·l/s) are provided for sealed and flanged components.
Yes. We specialize in build-to-print OEM configurations. Our workshop integrates glass-blowing lathes, automated welding stations, precision diamond slotting machines, and optical polishing lines. We regularly fabricate ISO/KF flanges, spherical ground ball-and-socket joints, welded side-arms, thermocouple wells, and injector gas feed ports directly to customer CAD/STEP files.
Borosilicate glass (Pyrex/Borofloat) has an upper continuous limit of approximately 450°C-500°C and a thermal expansion coefficient around 3.3×10⁻⁶/K. In contrast, fused quartz (pure SiO₂) operates continuously at 1,100°C with an ultra-low thermal expansion coefficient of 5.5×10⁻⁷/K—nearly 6 times lower than borosilicate. This confers unmatched thermal-shock tolerance, allowing red-hot quartz at 1,100°C to be immersed in ice water without cracking.
Explore our full line of specialized wholesale quartz products. Engineered for thermal resistance, optical brilliance, chemical inertness, and structural longevity across demanding US laboratory and industrial installations.
Send your dimensional drawings (PDF, DWG, STEP) or target specifications. Our quartz application engineers respond with verified manufacturability analysis, trace purity data, and direct DDP delivery rates within 24 hours.
