Who We Are
Donghai Kemzo Quartz Products Co., Ltd. is a specialized manufacturer and exporter focused on high-purity fused quartz processing, thermal components, and scientific glassware since 2011.
Headquartered at 7 North Huaya Road, Lianyungang, Jiangsu, China, our company operates in Donghai County—globally recognized as the crystal capital for its rich silicon dioxide reserves and comprehensive quartz industrial cluster. This strategic location enables us to secure premium raw natural quartz crystal and maintain stable, cost-effective supply chains for international purchasers.
With modern flame-working facilities, precision cutting equipment, double-sided optical grinding machines, and high-temperature vacuum sintering furnaces, we provide complete OEM, ODM, and customized quartz fabrication. Our products serve semiconductor furnaces, photovoltaic cell processing, chemical analytical laboratories, high-power infrared heating, and UV sterilization industries across the globe.
“Client is the Center, Quality is the Key.” We adhere to stringent dimensional tolerances, verified chemical purity (≥ 99.99% SiO₂), and guaranteed thermal stability on every export shipment.
Operational & Trade Profile
Essential enterprise verification details for international procurement specialists, technical auditors, and supply chain managers.
| Enterprise Parameter | Registered & Verified Specification |
|---|---|
| Company Legal Name | Donghai Kemzo Quartz Products Co., Ltd. |
| Registered Address | 7 North Huaya Road, Lianyungang, Jiangsu, China (Donghai County) |
| Primary Product Scope | Fused Quartz Glass Tubes, Quartz Crucibles, Quartz Plates & Discs, Ground-Joint Quartz Glassware, Quartz Boats, Quartz Rods, High Purity Quartz Sand, Quartz Wool |
| Custom Manufacturing Services | OEM, ODM, Buyer Label, Custom Drawing Fabrication, Sample Prototyping |
| Annual Sales Volume | US$10 Million – US$50 Million (Export Share 70% – 80%) |
| Government & Quality Honors | Jiangsu High Technology Enterprise, Verified On-site Facility, ISO 9001 Certified |
| Inquiry Response Standard | Average initial technical and commercial feedback ≤ 1 hour |
| Incoterms Supported | FOB, CFR, CIF, EXW, DDU, DAF, Express Door-to-Door Courier |
| Accepted Currencies & Payment | USD, EUR, AUD, HKD, CNY via T/T, L/C, PayPal, Cash |
Quality Control & Manufacturing Excellence
Strict verification at every stage of the fused quartz manufacturing cycle ensures zero-defect delivery for mission-critical industrial applications.
Strict Raw Material Grading
We source premium Donghai natural crystalline silica, implementing chemical assay checks to verify SiO₂ purity up to 99.99% while ensuring trace metal contamination (Fe, Al, Ti, Ca) remains within tight international thresholds.
Thermal Annealing & Stress Relief
All flame-worked components, furnace diffusion tubes, and ground glass joints undergo controlled electric annealing cycles above 1120°C to relieve internal stresses and prevent thermal shock failure under severe heating cycling.
Precision Dimensional Inspection
Using digital calipers, micrometers, and optical comparators, our QA engineers inspect outer diameter, wall thickness uniformity, runout, and surface flatness down to ±0.05 mm or customized drawing tolerances.
Optical & Visual Testing
Tubes, sight windows, and spectrometer slides are screened under high-intensity polarized backlights to verify freedom from bubbles, airlines, scratches, stones, and micro-inclusions.
Cleanroom Washing & Decontamination
Components for semiconductor, analytical, and optical applications receive acid-washing and deionized ultrasonic cleansing to remove cutting slurry and surface residues prior to clean packaging.
Reinforced Export Packaging
Fragile quartz glassware is vacuum-sealed or cushioned with thick pearl cotton foam, enclosed in dual-wall corrugated inner cartons, and secured in fumigated plywood export crates engineered for ocean and air transit.
Global Export Footprint
Our quartz solutions are relied upon by industrial engineers and purchasing teams across major global hubs.