Precision Process Portfolio
High-Purity Fused Quartz & Fabrication Solutions
Manufactured from optical-grade crystalline quartz and synthetic fused silica (SiO₂ ≥ 99.99%). Complete laser cutting, CNC thermal coil bending, and surface finishing directly from Donghai County.
100%
Inquiry Verification Rate
≤ 2h
Engineer Technical Reply
43%
Verified Repeat-Order Rate
≥ 1100°C
Continuous Working Temp
Engineering Insight
Quartz Spiral Tubes: Precision Helical Geometry & Thermodynamics
Comprehensive engineering analysis of helical fused silica coils used in semiconductor thermal processing, flow chemistry reactors, and photonics heat-exchange units.
Helical Coil Hydrodynamics
The secondary flow phenomenon known as Dean vortices within quartz spiral tubes drastically boosts mass transfer and radial heat distribution. In microreactor chemistry, helical coils deliver narrow residence-time distribution (RTD), eliminating hot spots during exothermic chlorination or photochemical synthesis without wall contamination.
Near-Zero Thermal Expansion
Possessing an ultra-low linear thermal expansion coefficient of 5.5 × 10⁻⁷ /°C, our fused quartz spiral tubes withstand cyclic thermal shocks from 1100°C directly dropped into ice water without structural rupture. This makes them ideal for rapid thermal annealing (RTP) and atomic layer deposition (ALD) lines.
Chemical & Plasma Inertness
With an amorphous structure consisting of >99.99% SiO₂, our quartz spiral tubes provide virtually inert resistance against halogen vapors, aqua regia, sulfur dioxide, and concentrated acids at elevated temperatures (excluding HF and phosphoric acid >300°C), preventing process fluid cross-contamination.
| Physical / Chemical Property | JGS1 (Synthetic Fused Silica) | JGS2 (Optical Fused Quartz) | JGS3 (Infrared Fused Quartz) |
|---|---|---|---|
| Transmission Range (nm) | 185 nm – 2500 nm (Deep DUV) | 220 nm – 2500 nm (Standard Optical) | 260 nm – 3500 nm (Low OH Infrared) |
| Hydroxyl Radical Content (OH⁻) | < 5 ppm (or high-OH type >1200 ppm) | 30 – 150 ppm | < 5 ppm (Water-band free at 2.73 µm) |
| Continuous Max Operating Temp | 1150 °C | 1100 °C | 1100 °C |
| Annealing Point / Softening Point | 1215 °C / 1710 °C | 1180 °C / 1683 °C | 1180 °C / 1683 °C |
| Typical Impurities (Fe, Al, Ti, Ca) | < 1.0 ppm aggregate total | < 15 ppm aggregate total | < 15 ppm aggregate total |
| Recommended Spiral Applications | Excimer Laser Cooling, DUV Photoreactors | Thermal Heat Exchangers, Ozone Injectors | Semiconductor IR Heaters, Gas Pyrolysis |
Procurement Intelligence
Future Procurement Trends in Quartz Processing & Global Sourcing
Key market vectors shaping supply chain planning for wafer fabs, chemical plants, and high-temperature apparatus OEMs through 2026–2030.
Sub-Millimeter Helical Pitch Tolerances
Standard quartz blowing has evolved into automated CNC lathe forming. Tier-1 buyers demand coil-to-coil concentricity within ±0.15 mm to ensure uniform fluidic flow and prevent mechanical harmonic resonance under fluctuating high pressures.
Direct Laser Grooving & Cold Machining
Thermal flame bending often introduces localized wall thinning. Advanced procurement specifications increasingly enforce hybrid cold-machining and CO₂ laser polishing to eliminate micro-fractures on spiral entry/exit flanged seals.
Verified Traceability of Raw Quartz Sands
Geopolitical diversification is driving fabs to require full purity assay documentation (ICP-MS testing). Exporters with certified raw sourcing from Donghai's established crystal quartz supply chain deliver guaranteed chemical consistency.
Rapid Prototype-to-Batch Turnaround
Lead times are shrinking from 12 weeks to 15 business days. Direct-to-drawing OEM/ODM execution eliminates intermediary markups and accelerates cycle times for pilot-scale flow chemistry reactors and semiconductor CVD quartz replacements.
Company Profile & Strengths
Why Global Buyers Partner with Zunex Quartz Products Co., Ltd.
Rooted in Donghai County—the crystal and quartz capital of China—we bridge world-class craftsmanship with strict enterprise quality control.
Geographical Cluster Advantage
Situated in Donghai County, Jiangsu, Zunex Quartz leverages direct access to superior natural quartz veins and synthetic preforms. This localized material cluster guarantees immediate raw availability and uncompromised cost efficiency across all orders.
Custom Quartz Laser Finishing
Beyond traditional hot glass blowing, our workshop features proprietary laser finishing technologies including micron-level drilling, slotting, precision groove routing, and automated spiral pitch looping without internal stress concentration.
Strict Metrology & Quality Control
Every quartz spiral coil, wafer, and twin tube undergoes optical polariscope stress inspection, ultrasonic thickness testing, and helium leak detection before dispatch. We guarantee pristine surfaces free of bubbles, micro-cracks, and particulate inclusion.
Direct OEM/ODM Engineering Quoting
No sales middleman bottlenecks. Your DWG, PDF, or STEP 3D models are evaluated directly by senior quartz fabrication engineers within two hours, offering actionable DFM (Design for Manufacturability) advice and crystal-clear volume tiered quotes.
Engineered Anti-Vibration Export Packaging
Fragile quartz spiral assemblies require zero-tolerance packaging. We utilize custom CNC high-density EVA foam pockets, vacuum polybags, and fumigated reinforced wooden export crates that have logged a 99.8% safe arrival track record worldwide.
Demonstrated Global Export Authority
Holding verified status with US$2.5M - US$5M annual output and an audited 43% buyer repeat order rate, our quartz assemblies run continuously in scientific institutes, university cleanrooms, and semiconductor fab lines across 40+ countries.
Procurement Q&A
Frequently Asked Questions on Quartz Spiral Tubes & Custom Fabrication
Authoritative technical answers to common queries regarding tolerances, material grades, continuous temperatures, and customized OEM production.
What are the typical dimensional tolerances for custom OEM quartz spiral tubes?
For precision quartz spiral tubes, standard coil outer diameter (OD) and helical pitch tolerances are held to ±0.5 mm for manual flame processing, and up to ±0.15 mm when manufactured using our precision CNC thermal lathe tooling. Wall thickness variation along the coil curvature is maintained within ±10% of nominal specs. For optical end faces, ground flanges, or laser-cut ports, we achieve tight mechanical limits down to ±0.05 mm.
How do JGS1, JGS2, and JGS3 materials affect spiral tube performance?
Material selection dictates both spectral transmission and thermal resistance. JGS1 (synthetic fused silica) features near-zero bubble inclusion and excellent deep UV transmission down to 185 nm, crucial for photochemical reaction coils and UV water purification. JGS2 represents the standard industrial fused quartz made from natural crystals, providing superior continuous thermal resistance up to 1100°C for tube furnaces. JGS3 is specifically de-hydroxylated (<5 ppm OH⁻), ensuring zero absorption dips at the 2730 nm infrared band, making it the industry standard for IR heating elements and catalytic pyrolyzers.
Can fused quartz spiral tubes withstand high operating pressure?
Yes. Due to the inherent high compressive strength of fused quartz (approx. 1100 MPa), helical coils distribute mechanical hydrostatic stresses exceptionally well. Depending on the tube diameter (OD 6 mm to 25 mm) and wall thickness (1.5 mm to 3.0 mm), operating pressure ratings can safely range between 1.5 MPa to 6.0 MPa (15 to 60 bar) at ambient to moderate temperatures. Every pressurized unit undergoes rigorous hydrostatic burst and vacuum leak checks prior to release.
What surface finish and laser machining options do you supply?
We provide comprehensive post-forming surface treatments: transparent fire-polishing, matte sandblasting/frosting (chemical or mechanical), precision optical double-sided lap-polishing (Ra < 0.5 nm for inspection windows), and laser micro-drilling. Our laser processing avoids the micro-cracking common with diamond mechanical drills, yielding clean-edged capillary orifices, gas nozzles, and slotted wafer cradles directly on curved quartz surfaces.
What is the minimum order quantity (MOQ) and production turnaround for custom prototypes?
We actively support R&D engineering trials and accept 1-piece custom prototype MOQs. For standard prototype drawings (PDF/DWG/STEP), sample manufacturing is completed within 5 to 7 working days. Full batch orders typically ship within 2 to 3 weeks depending on the complexity of bending, annealing cycles, and flanged connections.
Launch Your Custom Quartz Spiral Project
Send your CAD drawings, dimensional parameters, or application operating conditions directly to our Donghai engineering team for a full review and prompt quotation.