SiO₂ ≥ 99.99%
Engineered Fused Quartz Solutions for Da Nang Industrial Supply Chains
Explore our core fused quartz portfolio, fabricated to micrometric precision from high-purity natural silica sand in Donghai, China, and shipped directly to Tien Sa and Da Nang logistics zones.
1450°C Peak
High Pressure
CVD / Vacuum
Optical Filter
∅ 4-42mm
UV Transmission
Micro-Bore
Strategic Fused Quartz Applications in Da Nang & Central Vietnam Hubs
Da Nang's evolution into a high-technology industrial center has accelerated demand for cleanroom-grade quartz glassware across semiconductor fabrication, green energy photovoltaics, marine bio-processing, and laboratory infrastructure.
Semiconductor & Microelectronics at Da Nang Hi-Tech Park (DHTP)
Vietnam's strategic focus on microelectronics packaging, MEMS sensors, and wafer-testing facilities in Hoa Vang District requires high-purity clear fused quartz tubes for LPCVD, PECVD, and thermal diffusion processes. Our transparent quartz tubes feature total metallic impurities below 20 ppm, preventing ionic contamination during high-temperature thermal oxide growth.
Photovoltaic Cell Production & Solar Cell Manufacturing
Central Vietnam's renewable energy manufacturing belt requires continuous-run tube furnace tubes capable of operating at 1100°C for hours. Donghai Kemzo's quartz furnace tubes demonstrate extraordinary thermal stability with an expansion coefficient of only 5.5 × 10⁻⁷/°C, mitigating sagging and ovality deviations in long horizontal diffusion setups.
Marine Biotechnology & Quality Testing in Hoa Khanh Industrial Zone
Analytical laboratories at the University of Da Nang and testing facilities in Hoa Khanh rely on our capillary micro-bore quartz tubes and acid-resistant combustion vessels. Fused quartz stands impervious to almost all acids (except hydrofluoric and hot concentrated phosphoric acid), ensuring uncontaminated spectrochemical results.
Industrial Trends Shaping Da Nang's Fused Quartz Procurement
A strategic overview of economic shifts, technological modernizations, and supply chain adjustments transforming Central Vietnam's optical and industrial glass markets.
Supply Chain Diversification Towards Direct Factory Sourcing
Procurement directors across Da Nang, Quang Nam, and Thua Thien Hue are shifting away from intermediate domestic brokers toward primary manufacturers in regional hubs like Donghai, China. By sourcing directly from ISO 9001-certified factories, buyers reduce landed component costs by 22% to 35% while securing custom fabrication directly against technical drawings.
Stricter Cleanliness & Purity Standards for Advanced Assembly
With global tier-1 electronics assemblers establishing operations within the Da Nang Hi-Tech Park, standard industrial borosilicate glass is no longer acceptable for high-temperature sight ports, UV curing lamps, or CVD reactor liners. Transparent fused quartz, with purity levels exceeding 99.99% SiO₂, has become the baseline requirement for contamination-critical production lines.
Shorter Maritime Lead Times to Da Nang Sea Ports
Enhanced maritime routes connecting Lianyungang Port directly to Da Nang Port (Tien Sa / Lien Chieu terminals) have cut transit durations down to 6–10 days. Combined with specialized shockproof crating, Central Vietnamese buyers achieve seamless inventory replenishment without holding excessive inventory buffers.
Physical & Thermodynamic Properties of Fused Quartz Glass
Comprehensive engineering reference comparing transparent fused quartz material properties for thermal, optical, and mechanical applications in manufacturing environments.
| Property Parameter | Certified Value | Operational Impact for Da Nang Buyers |
|---|---|---|
| Chemical Composition | SiO₂ ≥ 99.99% | Guarantees minimal trace metallic impurities (Fe ≤ 1.5 ppm, Al ≤ 15 ppm, Cu ≤ 0.5 ppm), preventing batch cross-contamination. |
| Maximum Working Temperature | 1100°C (Continuous) / 1450°C (Short-Term) | Maintains rigid mechanical geometry in high-temperature vacuum sintering and analytical tube furnaces. |
| Softening Point | ≈ 1683°C | Defines upper mechanical envelope before dimensional slump occurs during high-temperature thermal cycling. |
| Thermal Expansion Coefficient (20–300°C) | 5.5 × 10⁻⁷ / °C | Approximately 1/6th that of borosilicate glass; components withstand extreme thermal shock and rapid water quench tests. |
| Refractive Index (nD at 589.3 nm) | 1.4585 | Exceptional optical transmission throughout UV, visible, and near-infrared spectral wavelengths (190 nm – 2500 nm). |
| Dielectric Strength | 25–40 kV/mm (at 20°C) | Provides outstanding high-voltage electrical insulation for semiconductor plasma chambers and RF sputtering equipment. |
Why Da Nang Engineers & Importers Partner with Donghai Kemzo
Established in 2011 in Donghai County—the crystal and quartz capital of China—Donghai Kemzo Quartz Products Co., Ltd. combines geological material advantages with advanced precision cold-machining and hot-working technologies.
Source Cluster
Source-Region Raw Material
Direct access to Donghai's world-class high-purity natural silica sand reserves ensures uniform chemical stability, stable ingot purity, and reliable supply contracts across large volume runs.
Certified Quality
ISO 9001 & High-Tech Credential
Certified under ISO 9001 Quality Management Systems and recognized as a Jiangsu High Technology Enterprise. Our strict internal protocols cover optical bubble elimination, annealing stress relief, and micrometer tolerance validation.
Custom Machining
11+ Years OEM / ODM Precision
Full in-house processing capabilities: CNC cutting, laser micro-drilling, surface optical polishing, precision bending, fire-polishing, and welding custom ground-glass joints directly to customer CAD drawings.
Direct Logistics
Export-Ready Packaging & Logistics
Over 70% of total output is exported globally. Our export crating incorporates multi-layer shock isolation, individual tube dividers, and moisture barriers formulated specifically for humid tropical ocean transit to Da Nang Port.
Frequently Asked Questions: Sourcing Quartz Glass in Da Nang
Practical commercial, technical, and regulatory answers for industrial procurement specialists, process engineers, and import coordinators in Central Vietnam.
How does Donghai Kemzo ship custom quartz tubes to Da Nang, and what are transit durations?
We routinely deliver to Vietnamese buyers via sea freight through Da Nang Port (Tien Sa Terminal) or air express for urgent requirements via Da Nang International Airport (DAD). Standard ocean transit from Lianyungang or Qingdao to Da Nang takes approximately 7 to 12 days depending on vessel scheduling. Express courier shipments (DHL, FedEx) for custom samples or capillary tubes arrive within 3 to 4 business days.
What packaging methods are utilized to prevent glass breakage during sea shipping to Vietnam?
Fragile quartz tubing requires specialized export packaging. Each tube or vessel is individually wrapped in high-density EPE foam or bubble sleeves, fitted with internal structural supports, and packed in reinforced multi-wall cartons with partition dividers. Cartons are then secured inside ISPM-15 compliant, heat-treated fumigation-free wooden export crates with internal impact-absorbing suspension.
Can we order custom-dimensioned quartz tubes, flanged vessels, or ground joints to our own technical drawings?
Yes. With over 11 years of dedicated OEM and ODM manufacturing experience, we specialize in tailored fabrication. We regularly cut, slot, fire-polish, flare, bend, and weld fused quartz according to provided PDF, DXF, or STEP CAD drawings. Our engineering team confirms dimensional tolerances, wall thickness limits, and geometric feasibilities typically within 1 hour of receiving specifications.
What international trade incoterms and payment terms do you support for Vietnamese clients?
We accommodate standard global commercial terms including FOB (Chinese port), CFR, CIF Da Nang Port, EXW, and DDU/DAP door-to-factory delivery. Flexible payment arrangements are accepted via Telegraphic Transfer (T/T), Letter of Credit (L/C at sight), and PayPal for prototype sampling orders in USD, EUR, or CNY currencies.
What is the difference between standard transparent fused quartz and synthetic fused silica?
Transparent fused quartz is produced by electric-arc or oxyhydrogen flame melting of purified natural quartz crystal sand. It offers exceptional mechanical strength, heat resistance up to 1100°C continuous, and excellent chemical resistance at an economical cost ideal for furnaces, sight glasses, and chemical piping. Synthetic fused silica is synthesized via chemical vapor deposition (CVD) of silicon tetrachloride (SiCl₄), offering extreme UV transmission down to 185 nm and negligible metallic trace impurities required exclusively for deep-UV lithography and excimer optics.