Featured Industrial Fused Quartz Components & Tubes
Every product listed below is precision-fabricated to tight engineering tolerances, using raw synthetic or fused silica tailored for continuous operation at 1100°C and resistance to aggressive chemical etching.
JGS1 / UV Grade
99.99% Purity
Twin Tube Geometry
Optics & Chambers
CVD & Vacuum
Corrosion Proof
1100°C Rated
Thermo-Mechanical Superiority of Fused Silica Coil Tubes
Demystifying the design, thermodynamic performance, and micro-structural consistency of custom helical fused quartz tubes engineered for continuous operational duty under extreme thermal gradients.
Near-Zero Thermal Expansion Coefficient
Fused quartz exhibits an extraordinarily low linear coefficient of thermal expansion (CTE) of approximately 5.5 × 10-7 /°C across the 20°C to 1000°C spectrum. This metallurgical trait allows our quartz coil tubes to withstand instantaneous thermal shock transitions (ΔT > 1000°C)—such as quenching from red heat into cold water—without structural devitrification, micro-fracturing, or mechanical creep.
In closed-loop thermal transfer and high-pressure condensed gas exchangers, helical quartz coils maintain volumetric dimensional stability, guaranteeing that internal pressure resistance is preserved even during unmoderated thermal runaway cycles.
Unmatched Chemical Purity & Acid Resistance
Consisting of over 99.99% silicon dioxide (SiO2), our quartz glass remains inert to virtually all corrosive chemicals, inorganic acids (including boiling hydrochloric, nitric, and sulfuric acids), and halogen gases. The only exceptions are hydrofluoric acid (HF) and hot concentrated phosphoric acid above 300°C.
For high-end chemical synthesis in Da Nang's advanced processing parks, our quartz coil heat exchangers prevent metallic contamination (such as Fe, Cu, Ni, or alkali elements < 1 ppm total), safeguarding pure reagents and high-grade semiconductor precursors from batch contamination.
Optimized Helical Fluid Dynamics
Through specialized CNC lathe glass-forming and hydrogen-oxygen torch winding, our OEM/ODM quartz coils achieve precise pitch tolerances (±0.2mm), uniform tube wall thickness, and perfectly cylindrical bore paths. The coiled geometry induces secondary centrifugal flow (Dean vortices), markedly boosting the convective heat transfer coefficient relative to straight run lines.
This allows engineering teams in Da Nang to build ultra-compact, high-efficiency inline fluid heaters, photochemical immersion sleeves, and vaporizers that maximize residence time without causing local hot spots or stagnant fluid boundaries.
Localized Application Scenarios in Da Nang's Key Zones
Da Nang has rapidly transformed into Vietnam's premier tech corridor. Discover how our custom OEM/ODM quartz coil tubes, twin-bore sleeves, and combustion components solve acute thermal processing challenges across the municipality's high-tech clusters.
Semiconductor Assembly & Wafer Annealing
At DHTP, precision packaging, test facilities, and emerging microelectronics foundries require high-temperature furnace liners, thermocouple protection sheaths, and spiral quartz gas preheaters for rapid thermal annealing (RTA) and chemical vapor deposition (CVD) tools operating above 1050°C under vacuum.
Photovoltaic (PV) Cell Processing
Solar cell cell manufacturers and component assemblers utilize high-purity quartz coil tubes as heat-exchanging condensers in silicon wafer etching tanks, phosphorus oxychloride (POCl3) liquid diffusion carriers, and continuous infrared twin-tube drying tunnels.
Corrosive Chemical & High-Salinity Processing
Da Nang's marine coastal proximity subjects conventional titanium or stainless-steel exchangers to stress-corrosion cracking and pitting. Our fused silica coil tubes operate as inert immersion heat exchangers in aggressive acid baths, electroplating setups, and sea-air-exposed chemical batch reactors.
Analytical Trace Element Digestion
Research centers, medical analytical testing centers, and university labs across Da Nang rely on our custom quartz glass ampoules, BET sample tubes, and optical quartz plates for spectroscopic analysis, chromatography heating loops, and clean sample digestion.
Development Trends Shaping Da Nang's Advanced Materials Demand
Analyzing the shift from labor-intensive assembly to deep-tech fabrication across Central Vietnam, driving the structural demand for world-class fused quartz consumables.
The "Silicon Valley of Central Vietnam" Initiative
Under Vietnam's National Semiconductor Strategy toward 2030, Da Nang is heavily incentivizing semiconductor design, assembly, and substrate-level manufacturing. As foreign direct investment (FDI) inflows expand DHTP's footprint, local equipment integrators must source high-spec quartz coil tubes and twin-tube infrared modules that conform to global cleanroom specifications without exorbitant European lead times.
Decarbonization & Green Energy Acceleration
The Central Coast's push toward renewable power and localized solar cell manufacturing is accelerating demand for thermal components capable of sustaining zero-breakdown 24/7 continuous furnace cycles. Fused quartz coils remain the only commercially viable, non-contaminating material capable of handling the high radiative heat flux required in modern photovoltaic cell doping lines.
Supply Chain Resilience via Direct Factory OEM/ODM
Purchasing agents in Da Nang are actively bypassing intermediary trading distributors in Singapore or Tokyo to partner directly with source-level quartz manufacturers in Donghai, China. Direct factory collaboration enables tailored drawing adaptations (≤ 2 hour response), custom flange/fitting integrations, and immediate customs clearing through Da Nang's Tien Sa Seaport.
Engineering Material Specification: JGS1 vs. JGS2 vs. JGS3
Review exact optical spectra, thermal limits, and chemical purity metrics to ensure accurate material selection for your application drawings.
| Material Parameter / Property | JGS1 (Synthetic Fused Silica) | JGS2 (Fused Quartz Optical) | JGS3 (Infrared Fused Quartz) |
|---|---|---|---|
| Primary Spectral Band | Deep Ultraviolet (DUV) & Visible | Standard UV & Visible Spectrum | Infrared (IR) & Visible Spectrum |
| Transmission Range | 185 nm – 2500 nm | 220 nm – 2500 nm | 260 nm – 3500 nm |
| Hydroxyl (OH-) Content | High (≤ 1200 ppm) | Medium (30 – 150 ppm) | Ultra-Low (≤ 5 ppm) |
| SiO2 Purity Level | ≥ 99.999% (Electronic Grade) | ≥ 99.99% (Industrial Grade) | ≥ 99.995% (Optical IR Grade) |
| Continuous Working Temperature | 1100 °C | 1100 °C | 1150 °C |
| Short-Term Max Temperature | 1300 °C | 1300 °C | 1350 °C |
| Softening Point | 1683 °C | 1680 °C | 1685 °C |
| Typical Industrial Usage | UV lithography windows, wafer sensor tubes, laser optics | Sight glasses, tube furnace bodies, quartz coil heaters | High-temperature IR emitters, moisture-free pyrometry |
Why Da Nang Industrial Leaders Rely on Our Factory
Headquartered in Donghai County—the world-renowned capital of crystal and high-purity quartz glass—Zunex Quartz Products Co., Ltd. combines advanced processing, certified QA, and rapid engineering response.
Laser Finishing Precision
Beyond standard flame forming, we specialize in high-precision quartz laser finishing—including CNC micro-drilling, high-aspect grooving, clean wafer slicing, and chamfering with zero micro-cracking.
Bespoke OEM/ODM to Drawing
Whether you provide CAD, PDF, DWG, or STEP models, our senior application engineers review your draft for thermal expansion tolerance, wall thickness consistency, and assembly clearances within two hours.
Door-to-Door Da Nang Logistics
Fragile quartz demands specialized export packing. We utilize custom shock-absorbent EPE foam nests and vacuum-sealed, fumigated wooden crates, shipping via air freight to Da Nang International Airport (DAD) or ocean freight to Tien Sa Port.
Rigorous Class-100 Cleanroom QA
Every batch undergoes polariscope residual stress testing, spectrophotometer transmission verification, and microscopic defect inspection for bubble, inclusion, and striation compliance before export release.
Frequently Asked Questions by Da Nang Procurement Teams
Clear, definitive answers addressing customs clearance, import duties in Vietnam, technical tolerances, and drawing submission criteria for industrial quartz ware.
What are the HS code and tariff structures for importing quartz coil tubes into Da Nang?
Fused quartz tubes, coil heat exchangers, and laboratory glassware generally fall under HS Code 7002.31.00 (Tubes of fused quartz or other fused silica) or HS Code 7017.10.00 (Laboratory, hygienic or pharmaceutical glassware of fused quartz). Under the ASEAN-China Free Trade Area (ACFTA), shipments accompanied by a valid Form E Certificate of Origin qualify for preferential 0% import duty rates entering Vietnam, requiring only standard Value Added Tax (VAT) settlement.
What dimensional tolerances can you achieve on complex helical quartz coils?
For custom OEM helical coils, we maintain standard tube outer diameter (OD) tolerances of ±0.15 mm to ±0.30 mm depending on nominal size. Coiling pitch spacing and overall helical outside diameter can be constrained to ±0.5 mm through specialized graphite mandrels. For laser-cut slots, end flanges, and precision ground joint faces, we comfortably achieve fine tolerances down to ±0.05 mm.
How do you guarantee zero breakage during sea transit to Tien Sa Port or air courier?
Quartz coil tubes are delicate three-dimensional structures susceptible to resonance and lateral shock. We engineer custom inner polyethylene (EPE) foam cutouts that cradle every individual coil turn, neutralizing internal vibration. The wrapped modules are sealed in rigid, heavy-duty honeycomb carton partitions or ISPM-15 compliant fumigated plywood crates with tilt-and-drop indicator tags, delivering an unbroken delivery record in excess of 99.4%.
Can you provide material certificates verifying purity and thermal limits?
Yes. Every export shipment can be dispatched with full Quality Inspection Sheets, Raw Material Batch Analysis Certificates (detailing trace elements such as Al, Fe, Ca, Mg, Ti, Cu < ppm thresholds), and optical transmission spectral curves. If your Da Nang cleanroom requires third-party SGS or RoHS compliance documentation, our engineering team supplies this prior to shipping.
Accelerate Your Da Nang Thermal & Optical Projects
Connect directly with our senior quartz engineering team in Donghai. Send your PDF/DWG/STEP drawings or process parameters today, and receive a comprehensive manufacturability review and competitive factory direct quotation within 2 hours.
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