Manufactured directly within China's primary silica capital in Donghai County, our comprehensive quartz line provides thermal shock resistance up to 1450°C and superior optical transmittance across UV, visible, and infrared spectra.
Bridging China’s highest-grade silica manufacturing cluster with eastern Spain’s advanced ceramic kilns, chemical laboratories, and green energy technology parks.
The industrial landscape of the Valencian Community (Comunitat Valenciana)—encompassing the metropolitan hubs of Valencia, Sagunto, and the adjacent ceramic belt of Castellón—demands thermal and optical components that operate beyond the physiological limitations of standard borosilicate glass. Modern high-temperature manufacturing relies heavily on synthetic fused silica and high-purity fused quartz plates. Fused quartz, produced by thermal fusion of natural quartz crystals, exhibits an extraordinary combination of properties: near-zero thermal expansion (5.5 × 10⁻⁷/°C), continuous service tolerance above 1100°C, and exceptional mechanical resistance under corrosive acidic environments.
For technical directors and procurement engineers in Valencia’s key industrial sectors, maintaining direct factory relations with an ISO 9001-certified primary quartz manufacturer in Donghai County, China, resolves two historic challenges: reducing the exorbitant markup of third-party European traders and obtaining sub-millimeter custom fabrication directly to CAD specifications without prolonged re-engineering delays.
Valencia’s diversified industrial clusters employ fused quartz plates, tubes, and crucibles across four specialized engineering sectors:
High-temperature sight windows, thermal observation ports, and pyrometer protection plates for continuous tunnel kilns and frit furnaces across the Castellón-Valencia ceramics belt.
Precision process quartz plates, wafer carriers, and quartz diffusion tubes for solar cell production lines and the emerging gigafactory ecosystem centered around Sagunto.
Ultra-clear UV transmission plates, optical filter windows, and cold-mirror substrates used extensively in high-speed packaging, label printing, and polymer coating facilities.
Spectroscopic cuvettes, reaction combustion boats, and custom quartz reactors supplying research teams at Universitat de València and Universitat Politècnica de València (UPV).
As part of Spain’s broader decarbonization roadmap (PNIEC) and the European Green Deal, the Comunitat Valenciana is aggressively transitioning its industrial base toward electrification and hydrogen-fueled thermal processes. In the ceramic tile sector, where traditional methane kilns are being retrofitted with electric and green hydrogen burners, operating temperatures fluctuate more dramatically, increasing the risk of thermal shock failure in sight glasses. Fused quartz plates, retaining mechanical integrity up to 1450°C for intermittent peaks and exhibiting virtually zero expansion, have become the standard upgrade over legacy borosilicate windows.
Furthermore, the emergence of the Mediterranean Battery Valley in Sagunto and regional solar cell manufacturing facilities has dramatically increased annual procurement volume for custom high-purity CVD process chambers, quartz carrier boats, and plasma-resistant plates. Local buyers require steady direct-from-factory volume agreements with robust packaging capable of maritime transit directly through the Port of Valencia (Puerto de Valencia).
To assist Valencia-based mechanical and chemical engineers in material specification, the table below delineates the critical thermodynamic and physical characteristics of Donghai Kemzo's high-purity fused quartz compared to alternative engineering glasses:
| Physical / Chemical Property | Donghai Kemzo Fused Quartz | Borosilicate Glass 3.3 | High-Alumina Ceramic |
|---|---|---|---|
| SiO2 Chemical Purity | ≥ 99.99% | ~ 81% | < 5% (Al2O3 base) |
| Max Continuous Service Temp | 1100 °C | 450 °C | 1400 °C |
| Peak Intermittent Temperature | 1450 °C | 500 °C | 1600 °C |
| Thermal Expansion (20-300°C) | 5.5 × 10⁻⁷ /°C | 33 × 10⁻⁷ /°C | 70 × 10⁻⁷ /°C |
| UV Transmission (200-300nm) | > 85% - 90% (JGS2/JGS1) | < 10% (Opaque in deep UV) | 0% (Opaque) |
| Thermal Shock Tolerance | 1100°C directly to cold water quench | Max 150°C thermal gradient | Moderate to poor spallation |
| Chemical Resistance | Inert to all acids (except HF/H3PO4) | Resistant, susceptible to alkaline | Good, varies with bonding matrix |
Established in 2011 in China's crystal capital, Donghai Kemzo Quartz Products Co., Ltd. combines geographic raw material superiority with strict ISO 9001 certified precision machining.
Direct access to world-class natural quartz reserves allows strict control over impurity elements like Fe, Al, and alkali metals from the very first sand fusion step.
Equipped with automated continuous drawing furnaces, CNC cutting stations, optical polishing beds, and hydrogen-oxygen flame lathe systems.
Over 11 years of engineering OEM parts from client DWG/DXF drawings. Tolerances held tightly to ±0.05mm on critical optical dimensions.
Seamless CIF/DDU shipments directly arriving at the Port of Valencia or Manises Airport via insured multi-layer shockproof wooden crating.
At Kemzo Quartz, every quartz glass plate, tube, and vessel passes through rigorous five-stage quality governance. Raw silica undergoes acid-leaching and magnetic separation, followed by electric arc or gas fusion. Post-forming components are subjected to precision annealing furnaces at 1215°C to completely eliminate internal mechanical stress, preventing catastrophic failure in client thermal cycling.
Our in-house dimensional and optical metrology suite verifies surface parallelism, scratch-dig standards (80/50, 60/40), and spectrophotometer transmission prior to packaging. We maintain full traceability on every production run exported to Spain.
Clear answers addressing import compliance, thermal suitability, drawing submissions, and transit security for European businesses.
We deploy export-grade packaging engineered for long-haul intercontinental transit. Each quartz plate is wrapped in protective dust-free scratch film, cushioned individually with custom-molded high-density polyethylene (EPE) foam, isolated within shock-absorbing inner cartons, and locked inside fumigated export wooden crates. Zero breakage guarantees apply on all CIF Valencia port and DDU shipments.
Yes. Over 70% of our production is customized OEM/ODM work. Send your PDF, DWG, DXF, or STEP files to our engineering desk. We examine thermal tolerances, chamfers, and hole placement, and provide detailed technical DFM (Design for Manufacturability) feedback within one business hour.
Natural fused quartz is melted from natural high-purity crystalline silica (SiO2 ≥ 99.99%), providing superior structural stability at high temperatures (up to 1100°C continuous) at a cost-efficient price point. Synthetic fused silica is chemical-vapor synthesized from SiCl4, offering superior deep UV transmission down to 190nm and virtually zero bubble inclusions, ideal for high-end laser and lithography viewports.
We routinely support FOB Shanghai/Qingdao, CIF Port of Valencia, CFR, EXW, and door-to-door DDU/DAP delivery. We accept commercial settlements in both Euros (EUR) and US Dollars (USD) through international Wire Transfer (T/T), Letter of Credit (L/C at sight), and PayPal for prototype samples.
Absolutely. Because we control precision grinding, lathe cutting, and flanging in-house, our replacement tubes match or exceed the dimensional, thermal, and mechanical specifications of major European kiln brands, significantly lowering recurring maintenance expenses for Valencian and Castellón manufacturers.
Yes. Pure fused silica is an inorganic, non-toxic, chemically inert material containing no lead, cadmium, or hazardous plasticizers. Our products fully comply with EU RoHS and REACH regulations, accompanied by standard material certification data sheets upon dispatch.
Whether you require custom quartz plates for furnace viewports, precision combustion boats for analytical assays, or bulk CVD process tubes delivered directly to your plant in Valencia, our bilingual engineering team is available 24/7 to assist.