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Engineered from pure Donghai fused silica with continuous thermal endurance up to 1200°C, zero thermal stress, and high UV-to-IR transmittance for Portuguese manufacturing plants and laboratories.
Analyzing the rising demand for transparent fused silica and quartz tube manufacturing across Portugal's green transition, semiconductor research, and advanced chemical corridors.
Portugal is experiencing a remarkable industrial and technological re-industrialization. Driven by the European Union's Net Zero Industry Act and the Portuguese National Energy and Climate Plan (PNEC 2030), the country is rapidly accelerating its renewable energy deployment, semiconductor research facilities, green hydrogen infrastructure, and high-efficiency chemical processing. Key industrial clusters located across Lisbon, Porto, Braga, Aveiro, and the deep-water industrial complex of Sines are actively upgrading their thermal and optical processing equipment, triggering a substantial surge in demand for wholesale transparent quartz tubes, fused silica furnace liners, quartz crucibles, and customized laboratory vessels.
With some of Europe's highest solar irradiance in Alentejo and Algarve, Portugal is expanding utility-scale PV wafer synthesis, requiring diffusion furnace quartz tubes and quartz boats capable of resisting severe thermal cycling without devitrification.
Institutes such as INL (International Iberian Nanotechnology Laboratory in Braga) and INESC-MN in Lisbon drive cutting-edge semiconductor fabrication and CVD/PVD thin-film research demanding 99.999% ultra-pure transparent quartz glass.
Industrial chemical complexes and emerging electrolyzer testing facilities utilize high-purity fused silica sight glasses, acid purification distillation columns, and corrosion-proof transparent reaction tubes.
In the northern manufacturing basin around Porto and Braga, transparent quartz tubes serve as critical heating furnace core tubes for metallurgical heat treatments, optical fiber preform drawing, and precision sensor fabrication. In central Portugal, specifically within the University of Aveiro and University of Coimbra material research ecosystems, fused silica tubes act as reactor chambers for vacuum tube furnaces, hydrothermal synthesis, and spectral calibration devices. Meanwhile, environmental analysis stations across the Tagus and Douro river basins rely on high-transmittance quartz sleeves in UV disinfection systems for industrial wastewater management and municipal water sanitization.
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 the demanding working conditions such as vacuum environment, high-temperature sintering, atmosphere control and precision experiments.
Equipped with large-scale continuous drawing production lines, computer-controlled quartz glass lathes, cleanroom annealing chambers, and precision CNC milling centers.
Strict compliance with ISO 9001 quality management systems, rigorous helium mass spectrometry leak detection, and rapid direct wholesale shipping to Lisbon and Leixões ports.
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.
| Property Parameter | Standard Metric Value | Industrial Significance in Portugal |
|---|---|---|
| SiO2 Chemical Purity | ≥ 99.99% – 99.999% | Zero trace-metal contamination in semiconductor wafer diffusion and epitaxial growth. |
| Continuous Working Temp | 1100°C – 1200°C (Short term up to 1300°C) | Superior heat tolerance for ceramic sintering, metallurgy, and industrial furnaces. |
| Thermal Expansion Coefficient | 5.5 × 10-7 cm/cm°C (20°C – 320°C) | Extraordinary thermal shock resistance: can be heated red-hot and submerged in cold water without cracking. |
| Softening Point / Annealing Point | 1680°C / 1210°C | Guarantees dimensional stability without sagging or warping during prolonged high-temp runs. |
| Optical Transmission | > 90% (UV 260nm to IR 2500nm band) | Essential for UV curing, water purification reactors, and infrared heating lamps. |
| Hydroxyl (OH-) Content | < 5 ppm to < 20 ppm (Dehydroxylated) | Prevents bubble formation and premature devitrification under intense thermal exposure. |
From raw quartz rock purification to thermal gas-phase drawing, CNC machining, fire polishing, and ultrasonic acid washing.
A professional manufacturer with over 10 years of experience in the quartz industry, empowering high-tech sectors with tailored quartz solutions.
Browse our full series of transparent quartz tubes, fused silica plates, quartz rods, and custom thermal accessories ready for export to Portuguese enterprise clients.
Offering end-to-end customization, high-precision dimensional tolerances (±0.05mm), certified shockproof export crating, and direct factory pricing.
Located directly in Donghai County, China's silicon capital. We ensure single-source natural crystal raw materials with strict trace element control (Al < 15 ppm, Fe < 0.2 ppm, OH < 20 ppm).
Custom outer diameters (OD 1.5mm to OD 800mm), wall thickness from 0.5mm to 20mm, CNC flanging, domed sealing, drilling, and spiral quartz coil fabrication delivered to your CAD drawings.
Specialized multi-layer EPE foam suspension, moisture-sealed vacuum pouches, and heavy-duty fumigated wooden crates ensure seamless delivery to Lisbon Airport, Port of Leixões, or Port of Sines.
Whether you require standard size stock tubes for immediate dispatch or bespoke large-diameter furnace tubes with precision quartz ground joints, our engineering and export team is ready to support your project:
