Engineered in Donghai to micron-level mechanical tolerances. Offering exceptional transmission from Deep-UV to Near-IR, extreme thermal shock resistance up to 1450°C, and inertness against aggressive industrial media.
Continuous working threshold of 1100°C with short excursion survival to 1450°C. Fabricated with tight diameter tolerance for vacuum furnaces.
Diamond-wheel ground flat-cut ends ensuring hermetic mechanical sealing under deep vacuum and volatile LPCVD/PECVD gas atmospheres.
Direct transmission across 190 nm to 2500 nm. Fire-fused solid bodies impervious to acid degradation, optimized for environmental and chemical analysis.
Designed for hydraulic sight indicators and offshore chemical feed lines where severe internal pressure and corrosive media require structural robustness.
Non-reactive glass carrier discs and laboratory vessels made from continuous melted pure silica, non-wetting and resistant to rapid chilling.
Micro-bubble engineered milky quartz plates providing enhanced infrared attenuation, superior heat trapping, and structural furnace thermal barriers.
Double-sided precision polished optical window substrate with λ/4 or λ/10 surface flatness. Crucial for laser diagnostics and offshore viewport systems.
Engineered for monocrystalline and polycrystalline silicon pulling or metallurgical assay melting. Excellent geometric integrity under prolonged thermal load.
In microelectronics, optical waveguiding, and high-temperature petrochemical sensors, materials reach physical tipping points. Standard borosilicate glasses fail catastrophically when subjected to severe thermal shocks or chemically corrosive gas vapors. Fused quartz crystal substrates, derived from naturally occurring crystalline silica or chemically synthesized precursors (synthetic fused silica), resolve these fundamental operational limits.
Donghai Kemzo Quartz utilizes mineral quartz deposits refined through proprietary multi-stage beneficiation and electric arc fusion. By eliminating microscopic seed bubbles, devitrification nucleation sites, and alkali metallic contaminants (Li, Na, K down to <1.5 ppm), our quartz crystal substrates deliver an exceptionally stable thermal expansion coefficient of only 5.5 × 10⁻⁷/°C. For engineering procurement teams operating in Burgas, this guarantees spatial dimensional stability during high-temperature annealing, continuous plasma deposition, and rapid furnace thermal cycling.
| Physical Parameter | Standard Metric Value | Engineering Significance |
|---|---|---|
| Silicon Dioxide (SiO₂) | ≥ 99.99% (Optical Grade) | Eliminates lattice trace contamination |
| Coefficient of Expansion | 5.5 × 10⁻⁷ cm/cm·°C (20–320°C) | Virtually immune to thermal shock |
| Softening Point | ≈ 1683°C | Structural integrity at white-hot heat |
| Annealing Point | ≈ 1215°C | Internal strain relief benchmark |
| Refractive Index (nD) | 1.4585 (at 589.3 nm) | High optical dispersion consistency |
| Dielectric Constant | 3.75 (at 1 MHz, 20°C) | Ideal low-loss RF/microwave substrate |
As Bulgaria's key maritime economic gateway on the Black Sea and home to Southeastern Europe's largest industrial refinery complex, Burgas commands critical use-cases for ultra-pure quartz components.
The refining complex in Burgas operates continuous thermal cracking, hydrotreating, and catalytic reforming processes. Our high-pressure small-bore sight glass tubes and circular quartz window substrates are deployed in reaction viewports and online spectrophotometric flow cells, withstanding high operating temperatures and volatile sulfur/hydrocarbon vapors without glass clouding.
Port of Burgas authorities and research institutions (including laboratories affiliated with Prof. Dr. Asen Zlatarov University) utilize our optical spectrophotometer quartz cuvettes. Offering high UV transmission down to 190 nm, these substrates enable trace detection of petroleum residues, heavy metal ions, and organic pollutants in marine and coastal water testing.
With the expansion of solar installations across Southeastern Bulgaria, local fabrication and R&D groups utilize our precision-ground quartz diffusion tubes and square quartz substrates for PECVD and vacuum deposition of advanced photovoltaic layers, ensuring zero alkali-ion migration into active semiconductor junctions.
The ongoing expansion of the Industrial and Logistics Park Burgas (part of the National Company Industrial Zones) is attracting high-value electrical equipment manufacturers, mechatronics assembly plants, and green hydrogen initiatives. These modern installations necessitate reliable tier-1 material suppliers capable of delivering precision-cut quartz components compliant with stringent European norms.
Historically, Bulgarian engineering teams sourced quartz hardware through multi-tier Western European trading houses, incurring extended delivery markups and prolonged lead times. Today, the direct procurement route from Donghai Kemzo Quartz offers Burgas-based enterprises direct factory pricing, ISO 9001 certified documentation, and rapid air or multimodal rail/sea freight directly into Port of Burgas or Sofia terminals.
Shipments departing our Donghai facility are consolidated at Qingdao or Shanghai ports and shipped via Mediterranean-Black Sea direct vessel schedules into Port of Burgas (Burgas Container Terminal). For critical manufacturing spares and urgent laboratory requirements, express door-to-door air freight via Burgas Airport (BOJ) or Sofia Airport (SOF) ensures 4-to-7 day transit times.
Every shipment is fortified with individual foam dampening, vapor-barrier inner shrink wrapping, and IPPC-stamped fumigated plywood export crates engineered to prevent transit shock.
Combining natural mineral wealth from China’s quartz capital with advanced German and Japanese CNC diamond-finishing equipment.
Headquartered directly at China's quartz core in Donghai, Jiangsu. Direct access to raw silica feedstock guarantees consistent material grading, zero raw supply disruption, and competitive pricing for bulk supply contracts.
From micro-tubing to 600 mm diameter diffusion chambers. We machine, grind, lap, laser-cut, and flame-weld quartz according to customer engineering drawings (CAD, DWG, STEP) with micron-level tolerances.
Every batch undergoes polariscope residual stress examination, spectrochemical impurity verification, and coordinate measuring machine (CMM) dimensional checks prior to vacuum packaging.
Over 70% of output exported across Europe, North America, and East Asia. We manage full customs declarations, multi-currency settlement (EUR, USD), and comprehensive fragile-cargo marine insurance.
Direct answers to the regulatory, mechanical, and logistical questions Bulgarian engineers and procurement departments ask prior to contracting.
Natural Fused Quartz is manufactured by electric arc or gas fusion of naturally mined crystalline quartz sand (SiO₂ ≥ 99.99%). It features outstanding thermal stability (continuous use at 1100°C), minimal thermal expansion, and mechanical robustness at very cost-effective pricing, making it optimal for furnace process tubes, heating fixtures, sight glasses, and metallurgical crucibles.
Synthetic Fused Silica is synthesized chemically through the vapor-phase hydrolysis of pure silicon tetrachloride (SiCl₄). It contains virtually negligible metallic impurities (ppb level) and delivers nearly 100% optical transmission in the deep ultraviolet range (down to 185 nm) without solarization. Choose synthetic silica if your Burgas application involves UV lithography, laser optics, or advanced semiconductor microfabrication.
For seamless clearance at the Customs Office in Burgas (Mitnitsa Burgas) or Sofia Cargo Airport, we provide a complete import documentation package. This includes: Commercial Invoice, Packing List with detailed net/gross weights and pallet dimensions, Clean on Board Ocean Bill of Lading or Air Waybill, Certificate of Origin (COO), and factory Mill Test Certificates (MTC) indicating SiO₂ composition. Our products are categorized under Harmonized System (HS) Codes such as 7002.31.00 (Tubes of fused quartz) and 7002.39.00 / 7006.00.00 (Plates and discs). Our materials fully comply with European RoHS Directive 2011/65/EU and REACH regulations.
Fragile cargo protection is built directly into our export procedures. Individual tubes and plates are wrapped in anti-static PE film and encased in high-density customized Pearl Cotton (EPE) shock-absorbing foam. Large diffusion tubes are anchored with cushioned internal cradles to prevent movement. Cartons are subsequently secured inside export-grade, IPPC heat-treated multi-layer plywood cases. Shipments carry tilt and impact indicators upon customer request, resulting in an unbroken transit safety rate above 99.8% across global logistics routes.
Yes. Our engineering division operates CNC ultrasonic machining centers, continuous double-side lapping systems, and precision glass lathes. We routinely produce custom components to customer specifications provided in PDF, DWG, DXF, or STEP formats. We achieve tight dimensional tolerances including outer diameter (OD) and wall thickness down to ±0.05 mm, flatness to λ/4 or λ/10, and optical surface roughness (Ra) down to < 0.5 nm for precision laser windows.
We accommodate commercial terms standard in European business operations. We support transactions in EUR, USD, and GBP via Telegraphic Transfer (T/T), confirmed Irrevocable Letters of Credit (L/C at sight), and PayPal for rapid sample prototyping. Available delivery terms include FOB Shanghai/Qingdao, CIF Port of Burgas, CIP Sofia, or DDU/DAP delivered directly to your plant facility in Burgas Industrial Park.
Submit your substrate dimensions, material grades, operating temperature limits, or mechanical drawings today. Our senior glass engineers review all inquiries within 60 minutes during standard business hours.
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