Company Overview
Lianyungang Zelvo Quartz Products Co., Ltd. – Engineered fused quartz glass fabrication, precision laser finishing, and custom components backed by over a decade of technical mastery.
About Lianyungang Zelvo Quartz Products Co., Ltd.
Onsite Verified Facility 
Lianyungang Zelvo Quartz Products Co., Ltd. is situated in Donghai County, Lianyungang City, Jiangsu Province – internationally acknowledged as the world's primary high-purity silica raw material and quartz fabrication hub. We are a specialized manufacturer and exporter focused on industrial-grade and experimental fused quartz products, serving worldwide partners across scientific research, semiconductor manufacturing, and solar PV sectors.
Our core capabilities involve precision fabrication of 99.99% SiO2 fused quartz glass. We engineer optical quartz plates, UV fused silica windows, thick-walled and twin-bore quartz tubes, quartz rods, CVD furnace boats, vacuum bell jars, and custom laboratory glass-blown apparatus. By integrating advanced laser micro-machining (high-tolerance drilling, micro-grooving, precise profile cutting) with time-tested glass-blowing craftsmanship, we turn complex technical drawings into tight-tolerance finished components starting from an MOQ of just 1 piece.
Our production strictly adheres to rigorous thermal shock, chemical purity, and dimensional tolerances, providing overseas industrial clients and research institutions with reliable, repeatable, and cost-effective quartz solutions.
Engineering & Processing Capabilities
Precision-Machined QuartzLaser Processing & Micro-Machining
Equipped with specialized laser cutting and CNC drilling machinery for micro-apertures, blind holes, and complex edge geometry without micro-cracking.
- Laser drilling down to 0.2 mm diameter
- Precision slotted XRD sample holders
- Smooth, chip-free edge grooving & contouring
Thermal Glass-Blowing & Joining
Decades of master craftsmanship in hydrogen-oxygen flame working, high-temperature annealing, joint fusion, and custom glassware assembly.
- U-bend & multi-bend tubular geometries
- Vacuum-tight quartz flange-to-tube welding
- Stress relief annealing up to 1215 °C
Optical Polishing & Lapping
Double-sided surface lapping, chemical-mechanical polishing (CMP), and sandblasting/frosting for optical windows, prisms, and disc substrates.
- Surface finish: 80/50, 60/40, or 20/10 scratch-dig
- High UV/IR spectral transmission (≥ 90%)
- Uniform frosted surfaces for diffuse emission
OEM/ODM Custom Prototyping
Engineering-first procurement service designed to turn custom research drawings and OEM specifications into durable prototypes starting at 1 unit.
- Full review of DWG, DXF, STP, and PDF designs
- Tailored grade selection (JGS1, JGS2, JGS3)
- Rapid sampling within 3–7 business days
Quality Control & Testing Methodology
Zero-Defect CommitmentTo fulfill the rigorous purity and reliability standards demanded by semiconductor wafer fabs and high-vacuum research applications, every production lot at Lianyungang Zelvo Quartz Products Co., Ltd. passes through a multi-tier verification process.
Raw Material Purity
Spectroscopic verification of SiO2 purity (≥ 99.99%) to safeguard against trace metallic contaminants like Fe, Al, and Cu.
Precision Metrology
Caliper, micrometer, and optical projector inspections guarantee outer diameters, wall thicknesses, and hole centers stay within ±0.05 mm.
Thermal Stress Check
Polariscope inspection to eliminate internal stress after flame-bending and welding, preventing fracturing under extreme thermal cycling.
Export Safety Packing
Multi-layered bubble wrap, custom shock-absorbent EPE foam compartments, and export-compliant fumigated wooden crates.
Global Market Reach & Export Performance
Serving 40+ CountriesWith strategic proximity to major shipping ports (Lianyungang, Qingdao, and Shanghai), we deliver efficient multi-modal freight solutions across 5 global regions with comprehensive Trade Assurance protection.