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Explore our top-tier fused quartz furnace tubes, high-purity digestion vessels, and specialized crystal components optimized for extreme thermal environments.
How ultra-pure fused quartz serves as the indispensable structural and process backbone for modern high-temperature synthesis, semiconductor fabrication, and harsh chemical reactions.
With sub-5nm microelectronic nodes and 3D NAND layering reaching unprecedented stack heights, thermal process chambers demand fused quartz tubes with total metallic impurities below 5 ppm to prevent cross-contamination during wafer diffusion and ALD (Atomic Layer Deposition).
The solar PV industry transition from PERC to TOPCon and HJT cell architectures involves prolonged high-temperature boron and phosphorus diffusion (900°C–1150°C), requiring oversized quartz furnace tubes with outstanding sag resistance and extended structural life cycles.
In tri-acid digestion, halogen gas purification, and trace element analysis, fused silica remains the singular economic material capable of withstanding boiling concentrated acids without ionic leaching or wall degradation.
Fused quartz glass is an extraordinary amorphous material composed virtually entirely of silicon dioxide (SiO₂). Unlike conventional multi-component silicate glasses that contain fluxing oxides (such as sodium, calcium, or boron), pure fused quartz retains a three-dimensional continuous random network of silicon-oxygen tetrahedra ([SiO₄]). This covalent molecular configuration yields a unique combination of thermodynamic stability, an almost negligible coefficient of thermal expansion, and total chemical inertness across the industrial spectrum.
As industrial manufacturing trends accelerate toward stricter cleanliness baselines and elevated continuous processing temperatures, fused quartz tubing has transitioned from a standard laboratory consumable into a mission-critical infrastructure component. In semiconductor front-end wafer fabrication, solar cell thermal crystallization, continuous metallurgy annealing, and specialty chemical digestion, quartz tubes must maintain mechanical rigidity under sustained thermal loads exceeding 1100°C while resisting chemical devitrification triggered by alkali vapours and acidic gases.
Deep material science principles underlying high softening points, thermal shock resilience, and acidic corrosion resistance.
The linear coefficient of thermal expansion (CTE) of fused quartz is extraordinarily low at approximately 5.5 × 10⁻⁷ /°C between 20°C and 1000°C—roughly one-thirtieth that of standard stainless steel and one-fifth that of borosilicate glass. This ultra-low expansion enables red-hot quartz tubes (heated to >1100°C) to be quenched directly in icy water without micro-cracking or catastrophic thermal shock failure.
Continuous operation at elevated temperatures (up to 1200°C) is supported by a high transformation point (1075°C) and softening point (1680°C). By controlling trace hydroxyl (OH⁻) content and metallic alkali impurities (Li, Na, K), our manufacturing processes inhibit the phase transformation from amorphous silica into crystalline cristobalite, preventing high-temperature tube warping and surface spalling.
Fused quartz exhibits total chemical inertness to virtually all acids—including concentrated hydrochloric acid (HCl), nitric acid (HNO₃), sulfuric acid (H₂SO₄), and aqua regia—even at boiling temperatures. The only chemical compounds capable of dissolving fused silica under normal industrial conditions are hydrofluoric acid (HF) and concentrated phosphoric acid (H₃PO₄) above 150°C. This ensures zero metal leaching, maintaining absolute purity during analytical digestion and semiconductor gas handling.
| Property Parameter | Standard Value | Testing Standard / Unit |
|---|---|---|
| SiO₂ Purity Level | ≥ 99.995% – 99.999% | ICP-MS Trace Analysis |
| Density (20°C) | 2.20 ± 0.02 | g/cm³ |
| Softening Point | 1680 – 1730 | °C |
| Annealing Point | 1215 – 1250 | °C |
| Strain Point | 1120 – 1150 | °C |
| Max Continuous Temp | 1150 – 1200 | °C |
| Thermal Expansion (CTE) | 5.5 × 10⁻⁷ | K⁻¹ (20°C to 300°C) |
| Dielectric Strength | 25 – 40 | kV/mm (20°C) |
| Spectral Transmission | > 90% (200nm–2500nm) | UV-Vis-NIR Transmittance |
Lianyungang Southeast Quartz Products Co., Ltd., established in 2015, is located in Donghai County, Lianyungang City, Jiangsu Province—a national base for silicon material industry. As a professional manufacturer integrating R&D, design, production, sales and import & export trade, the company relies on the superior high-quality quartz ore resources in Donghai County, deeply engages in the deep processing of quartz glass, and has become a core supplier of quartz consumables for photovoltaic, semiconductor, laboratory, chemical, lighting and other industries with mature production technology, strict quality control system and complete customized services.
The company has standardized production workshops, advanced quartz processing equipment and a professional R&D team, with full-process production capacity from quartz raw material processing to finished product manufacturing. It can produce a full range of quartz products, including high-purity fused quartz tubes, quartz furnace tubes, quartz bell jars, quartz boats, quartz lamp holders, quartz crucibles, quartz instruments (beakers, condensers, distillers, etc.), and tri-acid purification equipment.
All products are made of high-purity fused quartz raw materials, featuring excellent high-temperature resistance (up to 1200℃), thermal shock resistance, corrosion resistance, high light transmittance and good electrical insulation performance, which can meet demanding working conditions such as vacuum environments, high-temperature sintering, atmosphere control and precision experiments.
A professional manufacturer with over 10 years of experience delivering custom fused quartz components across critical industrial sectors.
Employed in horizontal/vertical diffusion furnaces, LPCVD, PECVD, and Rapid Thermal Processing (RTP). Crucial for quartz process tubes, wafer carriers, injector nozzles, and bell jars where sub-ppm elemental purity prevents metallic wafer contamination.
High-temperature oxidation and diffusion processes for N-type TOPCon and heterojunction (HJT) solar cells. Large-diameter quartz tubes and wafer loading boats sustain round-the-clock thermal cycling at 1000°C–1150°C with minimum deformation.
Delivering high optical transmittance across ultraviolet, visible, and near-infrared spectrums (190nm–3500nm). Applied in laser cavity flow tubes, UV sterilizers, optical fiber preform cladding, and precision pyrometry sight windows.
Applied in ultra-pure acid distillation, digestion vessels, reaction autoclaves, and petrochemical tube furnaces. Resists aggressive hydrochloric, nitric, and sulfuric reagents without elemental leaching or structural corrosion.
Equipped with standardized cleanroom processing lines, high-precision glass-blowing lathes, continuous electrical fusion furnaces, and automated thermal annealing systems.
From raw crystalline silica refining and thermal electric-arc / oxy-hydrogen drawing to CNC cold-working, fire polishing, and ultrasonic cleanroom packaging.
Adhering to the philosophy of "Quality First, Customer Supreme, Innovation-Driven, Integrity Management", the company has established a complete quality inspection system. All products undergo multiple tests such as helium mass spectrometry leak detection, pressure resistance test and purity test before leaving the factory to ensure stable performance, no impurities and no leakage. Meanwhile, the company provides flexible customized services, and can customize product sizes, structures and specifications according to customers' equipment parameters and process requirements, quickly responding to personalized orders.
With reliable product quality, efficient delivery capacity and thoughtful after-sales service, the products of Lianyungang Southeast Quartz Products Co., Ltd. not only cover all provinces and cities in China, but also are exported to many countries and regions in Europe, America, Southeast Asia, the Middle East, etc., winning wide recognition and trust from customers at home and abroad. In the future, the company will continue to deeply cultivate the field of quartz products, continuously improve technological innovation and production technology levels, and strive to provide global customers with higher-quality and more professional quartz product solutions, contributing to the high-quality development of high-end manufacturing and scientific research fields.
From oversized diffusion tubes and laboratory digestion vessels to precision quartz rods, optical ingots, and shaped plates.
Expert recommendations for selecting, installing, and maintaining fused quartz tubing under extreme industrial operating conditions.
Fused quartz tubes safely operate continuously at temperatures up to 1150°C to 1200°C in inert or oxidizing atmospheres. For intermittent or short-duration procedures, peak temperatures can reach 1300°C. When operated near the softening point (1680°C), mechanical load must be supported by specialized quartz boats or cradles to prevent gravitational sagging.
Devitrification is primarily nucleated by surface contamination from alkali ions (such as sodium, potassium, and calcium) and fingerprint oils. When clean, high-purity fused quartz is maintained in a contaminant-free atmosphere, the amorphous structure remains thermodynamically stable. We recommend periodic chemical cleaning with a dilute 5%–10% hydrofluoric (HF) acid rinse followed by ultra-pure deionized water washing before firing.
We fabricate quartz furnace tubes ranging from outer diameters (OD) of 2 mm up to oversized continuous tubes exceeding 600 mm OD, with custom wall thicknesses, flange terminations, Ground-Glass Joints (ball/socket/conical), domed ends, gas inlet/outlet sidearms, and threaded quartz fittings fabricated strictly to engineering CAD blueprints.