STEP 01 
Raw Materials Cutting
Natural quartz stone lumps are precisely cut and visually graded for crystal purity and vein uniformity prior to pulverizing.
Optical stone selection Enterprise Overview
Direct Fused Quartz Manufacturer in Lianyungang, China
Lovri Quartz Products Co., Ltd. operates a vertically integrated production plant spanning 14,271 square meters. Situated in the heart of China’s premier high-purity quartz cluster, we process natural silica ore into high-grade semiconductor, optical, and industrial fused quartz components.
Unlike assembly shops or distributors, Lovri controls raw material sizing, acid pickling, thermal drawing, annealing, precision welding, and CNC machining in-house. This closed-loop fabrication cycle ensures material traceability, defect reduction, and tight dimensional tolerance for critical applications worldwide.
SGS Verified Facility
RoHS Compliant Materials
Polarization Stress Tested
14,271 m² Factory Land Area
99.99% SiO₂ Optical Purity
100% Stress Inspection
Full Process Chain
Comprehensive In-House Quartz Fabrication
By eliminating subcontractors across our 12-stage manufacturing workflow, Lovri Quartz maintains strict contamination control and defect prevention at every manufacturing station.
STEP 02 
Raw Materials Pulverizer
Selected lump ore is pulverized using impact mills into uniform high-mesh silica sand without introducing iron contamination.
Contamination-free milling STEP 03 
Rescreening & Sizing
Vibratory multi-deck rescreening separates quartz sand particles to precise mesh curves essential for bubble-free fusion.
Controlled grain distribution STEP 04 
High-Purity Pickling
Acid baths remove trace metals, alkalis, and surface impurities, upgrading silica purity to ≥ 99.99% SiO₂ concentration.
≥ 99.99% purity standard STEP 05 
Tube Drawing
Continuous electric and gas melting towers draw molten silica into precision tubes and rods with tight OD and wall tolerances.
OD 1.5mm to 450mm STEP 06 
Precision Annealing
Programmed cooling profiles through thermal annealing zones eliminate internal stress and thermal shock susceptibility.
Stress relief up to 1215°C STEP 07 
End Sealing & Shaping
Glass-working lathes form round, flat, or hemispherical closed ends on furnace tubes, ozone cells, and digestion vessels.
High pressure test ready STEP 08 
Sealing & Bench Welding
Skilled quartz blowers seamlessly fuse joints, branches, glass-to-glass seals, and vacuum flanges to custom engineering drawings.
Hermetic optical seals STEP 09 
Vacuum De-aeration
High-vacuum baking removes micro air pockets and absorbed volatile gases for cleanroom semiconductor grade components.
High vacuum evacuation STEP 10 
CNC Machining
Diamond-tooled CNC centers mill complex geometries, wafer boat micro-slots, laser flow channels, and chamfered edges.
Tolerance down to ±0.02 mm STEP 11 
Full Quality Inspection
100% verification across critical checkpoints: dimensional laser micrometer gauging, bubble detection, and polarization stress testing.
Batch CMM & stress reports STEP 12 
Customized Packaging
EPE foam custom-molded inserts, double-ply corrugated cartons, and non-fumigation plywood crates guarantee zero transit breakage.
Global air & sea safe Advanced Machinery
Modern Production & Machining Equipment
Reliable quartz components depend on precision machinery. Lovri Quartz continually invests in high-rigidity CNC centers, automated annealing lines, and cleanroom test apparatus.
Precision Cutting Machine
Diamond saw wire slicing for high-yield, low-chipping cutting of large ingot blocks and thick-walled tubes.
End Sealing Lathe
Microprocessor-controlled burner arms for consistent dome and flat-bottom shaping on quartz reactor bodies.
Annealing Furnace Unit
Programmable multi-zone PID controlled heating chambers handling parts up to 3 meters in length.
Optical Inspection Unit
High-contrast collimated lighting tables for surface scratch, dig, and inclusion evaluation.
Packaging Line
Vacuum sealing and precision-cut cushioning assembly preventing mechanical shock and particle contamination.
Silica Pulverizer Machine
High-energy pulverizing mill crushing raw quartz lumps into micro-classified feed grains.
Rescreening Machine
Ultrasonic sieve classification preventing coarse contamination in precision drawing towers.
Pickling Machine
Acid-resistant automated recirculating system extracting alkali and metallic ions from silica granules.
Carton Packing Unit
Automated strapping and drop-test verified casing system for overseas ocean and air deliveries.
Tube Drawing Machine
Laser caliper feedback loop regulating draw speed and wall thickness uniformity within micron margins.
Continuous Annealer
Tunnel annealing apparatus for rapid cycle batch production without internal stress concentrations.
Flame Sealing Machine
Oxy-hydrogen dynamic sealing machine engineered for large-diameter semiconductor furnace tube ends.
Vacuuming Station
Turbo-molecular vacuum pumping systems reaching ultra-high vacuum state before final flame tip-off.
5-Axis CNC Center
High-torque wet milling centers dedicated entirely to optical glass and fused quartz fabrication.
Polarization Stress Inspection Optical retardation verified < 5 nm/cm
Quality Assurance Protocol
Eliminating Premature Thermal Failure
For semiconductor CVD processes, laser flow tubes, and high-pressure lamps, residual mechanical stress is the primary cause of sudden catastrophic failure. At Lovri Quartz Products Co., Ltd., every single thermally formed or welded item undergoes optical polariscope validation.
- Polarization Stress Verification: Quantitative retardation measuring guarantees minimal residual stresses across welded joints and thick flanges.
- In-House Testing Laboratory: Featuring spectrophotometers for UV-Vis-NIR transmission curves and coordinate measuring machines (CMM) for drawing dimensional compliance.
- Batch Traceability: Raw silica batch numbers, annealing furnace logs, and QA sign-offs are archived and provided with commercial inspection reports upon request.
Metrology & Inspection
Dedicated In-House Material & Dimension Laboratory
Our testing laboratory works alongside engineers and international procurement teams to validate that every custom batch adheres strictly to thermal, mechanical, and optical tolerances.
Whether you require extreme deep-UV transmittance (JGS1), infrared transparency (JGS3), or ultra-fine laser slot machining, our certified testing protocols eliminate risk before sea or air dispatch.
100% Anneal Log Checked
±0.02 mm Critical Tolerance
ISO/SGS Audited Procedures
Source Direct from Lovri Quartz Products Co., Ltd.
Share your CAD drawings, required quartz grades (JGS1, JGS2, JGS3, or opaque), and target tolerances. Our engineers deliver DFM analysis, competitive factory pricing, and full test certificates.