Optical Grade
Standard 2 & 4-Window UV Quartz Cuvettes
Constructed with high-transparency synthetic fused silica for deep ultraviolet-visible spectrophotometry down to 190 nm, packaged in foam cases.
Factory Direct Catalog
High-Performance Fused Silica Crucibles & Engineered Labware
Sourced from China's crystalline hub in Donghai and engineered to rigorous dimensional tolerances. These 8 featured product lines support mission-critical thermal melting, chemical digestion, spectroscopy, and high-vacuum furnace setups across international export corridors.
Thermal Acid Lab
Clear Fused-Quartz Beakers with Spout
Engineered for acid digestion and hot-plate chemical heating up to 1100°C continuous service, completely inert to corrosive industrial leachates.
Furnace Plate
High-Temp Circular Silica Quartz Discs
Circular fused silica plates with diamond-ground edges, used as thermal furnace setters, sintering trays, and high-temperature sight barriers.
Semiconductor
Precision Process Tubes for Vacuum CVD
Ultra-low bubble profile diffusion tubes with 90° squared ends, formulated for chemical vapor deposition chambers and high-vacuum annealers.
Crucible Boat
Transparent Bowl Quartz Boats & Carriers
Deep-drawn fused silica boats for pyrochemical treatment, metallurgy calcinations, and sample carrier containment in horizontal tube furnaces.
Light Guide
Solid Optical Fused Quartz Rods
Precision-drawn solid rods serving as structural supports inside aggressive hot zones, electrode insulation, and high-efficiency optical guides.
Furnace Window
Cobalt Blue Furnace Sight Glass Windows
Engineered for direct visual observation of smelting operations, kiln combustion flames, and ultra-high-temperature metal melt pools.
Chromatography
Small Bore Capillary Quartz Tubes
Micron-controlled internal diameters suited for gas chromatography, micro-fluidic analytical circuits, and specialized thermal sensors.
Industry Whitepaper · Material Science
High-Purity Fused Silica Crucibles: Structural Morphology and Thermomechanical Mechanics
In high-temperature metallurgy, semiconductor crystal growth, and laboratory pyrochemical synthesis, the performance of containment vessels directly influences melt purity and operational safety. A fused silica crucible is a precision refractory vessel composed of high-purity amorphous silicon dioxide (SiO2 ≥ 99.9% to 99.99%). Unlike traditional alumina, graphite, or porcelain refractories, fused silica features a near-zero coefficient of thermal expansion (5.5 × 10-7 /°C). This crystalline chemistry eliminates internal lattice shearing under sudden temperature drops, providing peerless resistance to thermal shock.
For industrial processing hubs, procurement managers must evaluate crucibles across three distinct physical parameters: chemical inertness to aggressive metal and slag melts, devitrification resistance (the structural conversion of vitreous silica to high-cristobalite at temperatures exceeding 1200°C), and tight dimensional sphericity. At Donghai Kemzo Quartz Products Co., Ltd., we utilize advanced slip-casting, arc-fusion, and precision diamond-tooling techniques developed over a decade to manufacture crucibles that resist leaching, wall spalling, and sagging under extreme furnace loads.
Fused Quartz vs. Synthetic Fused Silica: The Procurement Distinction
Procurement teams frequently encounter terminology overlap between fused quartz and synthetic fused silica. Transparent or opaque fused quartz is manufactured through the high-temperature electric or oxy-hydrogen arc fusion of natural, refined quartz sand sourced directly from geological deposits (such as the rich quartz basins of Donghai). This creates exceptionally durable crucibles, furnace tubes, and plates at a favorable cost-to-performance ratio suitable for gold and silver assaying, photovoltaic ingot pulling, and foundry melting.
Conversely, synthetic fused silica is synthesized via the chemical vapor deposition (CVD) or gas-phase hydrolysis of volatile silicon precursors such as silicon tetrachloride (SiCl4). The resulting amorphous glass exhibits near-zero metallic impurities (parts-per-billion grade) and deep-ultraviolet optical transmission. Whether your facility in San Pedro de Macorís demands high-volume thermal crucibles for metal casting or high-spec optical cells for QA spectrophotometry, understanding this material divide guarantees optimal operational expenditure and process yield.
| Physical & Thermal Property | Fused Quartz Crucible Grade | Synthetic Fused Silica Grade | Engineering Significance |
|---|---|---|---|
| Chemical Composition (SiO2) | > 99.9% – 99.99% | > 99.999% (ppb impurities) | Prevents metallic batch contamination |
| Coefficient of Thermal Expansion (20-300°C) | 5.5 × 10-7 /°C | 5.1 × 10-7 /°C | Extreme thermal shock resistance; zero water quench fracture |
| Continuous Working Temperature | 1100 °C | 1150 °C | Long-term furnace structural integrity |
| Max Short-Term Temperature | 1450 °C | 1550 °C | Sintering, rapid annealing, and induction melts |
| Softening Point | ≈ 1683 °C | ≈ 1730 °C | Lattice deformation threshold |
| Density | 2.20 g/cm3 | 2.20 g/cm3 | Lightweight compared to heavy ceramics |
| Thermal Conductivity (20°C) | 1.4 W/m·K | 1.38 W/m·K | Uniform heat distribution across the melt basin |
Industrial Application Vectors
Fused Silica Crucible Utilization in San Pedro de Macorís
Positioned on the southern coast of the Dominican Republic, San Pedro de Macorís is a vital Caribbean manufacturing hub, anchored by the port of San Pedro de Macorís and the vibrant Parque Industrial de Zona Franca San Pedro. The shift toward higher value industrial manufacturing has escalated local demand for specialized, thermal-containment glassware.
Medical Device Cleanrooms & Bio-Pharmaceuticals
The free trade zone of San Pedro de Macorís hosts world-class medical component packaging, diagnostic device manufacturing, and pharmaceutical laboratories. Fused quartz beakers, spectrophotometer cuvettes, and capillary quartz tubes provide the non-leaching, pyrogen-free chemical containment necessary to maintain ISO 13485 cleanroom validation.
Precious Metals, Mining Refining & Assays
With the Dominican Republic's active gold, silver, and nickel extraction operations in the Greater Antilles, assay laboratories and commercial refiners require crucibles capable of withstanding molten fluxes (borax, soda ash, silica) up to 1350°C. Fused silica crucibles prevent sample contamination, providing accurate metallurgical fire-assay readings.
Heavy Industrial Power Generation & Petrochemical Kilns
Home to major coastal thermoelectric complexes and industrial sugar and chemical processing plants, regional maintenance teams depend on thermal-shock resistant quartz sight glasses, cobalt blue furnace viewing discs, and high-pressure level-gauge tubes to monitor boiler flame temperatures safely.
Macro Trends · Dominican Republic 2025-2030
Regional Industrial Trends: Nearshoring, Quality Assurance & Custom Sourcing
The Dominican Republic is establishing itself as the logistical centerpiece of the Caribbean basin. Driven by nearshoring trends across the Americas, the export-oriented Free Trade Zones (Zonas Francas) are expanding beyond traditional assembly into electronics fabrication, advanced composites, medical instruments, and high-precision casting. This transition necessitates an uncompromising supply of ISO-certified thermal glass components.
Local purchasing agents in San Pedro de Macorís, Santo Domingo, and Haina have historically relied on indirect third-party distributors based in Miami or San Juan, incurring substantial markups and extended lead times for specialized components. Today, procurement directors are increasingly bypassing intermediaries to establish direct OEM/ODM contracts with verified manufacturing facilities in Donghai, China. By accessing source-origin factories equipped with precision CNC diamond grinding, laser profiling, and multi-tier annealing kilns, regional enterprises achieve up to 35% cost reductions while receiving custom components made precisely to CAD drawings.
99.99%
SiO2 Raw Material Purity
1450 °C
Short-Term Temperature Tolerance
≤ 1 Hour
Engineering Drawing Review Turnaround
11+ Yrs
OEM Export & Custom Machining Depth
Proven Manufacturing Prowess
Why International Exporters Choose Donghai Kemzo Quartz
Operating from Lianyungang, Jiangsu—China's crystal capital—we combine raw material dominance with ISO 9001 quality management systems to provide high-performance quartz glassware worldwide.
Raw Material Mastery
Direct Donghai Cluster Source
Situated within the world's most concentrated natural quartz processing belt, our raw silica selection is filtered before fusion. This ensures low bubble concentration, uniform wall thickness, and freedom from metallic contaminants.
Thermal Reliability
1100°C Continuous Rating
Our crucibles, process tubes, and plates undergo extensive stress-relieving annealing. They can be pulled red-hot from a 1100°C furnace and quenched into cold water without micro-cracking or fracturing.
Machining & Customization
OEM to Precise CAD Drawings
Equipped with computerized diamond cut-off saws, high-temperature glass lathes, fire-polishing ovens, and laser interferometers, we deliver custom crucibles, ground joints, and slot boats within tight engineering tolerances.
Global Logistics Safety
Export-Grade Wooden Crating
Over 70% of our production is exported internationally. Every fragile shipment is cushioned with tailored polyethylene foam, individually wrapped, and packed into reinforced fumigated wooden crates to ensure zero breakage upon arrival in Dominican ports.
Procurement Guidance
Frequently Asked Questions: Sourcing Fused Silica in San Pedro de Macorís
Practical technical answers to help purchasing agents and production engineers navigate material specifications, shipping logistics, and custom production.
What makes fused silica crucibles superior to traditional porcelain or graphite?
Fused silica crucibles provide exceptional thermal shock resistance (CTE of 5.5 × 10-7 /°C) and chemical inertness across oxidizing atmospheres. Unlike graphite, they do not oxidize or introduce carbon contamination into molten batches. Unlike porcelain, they withstand continuous operating temperatures of 1100°C and short-term excursions up to 1450°C without glass phase leaching or cracking during rapid thermal cycles.
What are the typical sea and air shipping times to San Pedro de Macorís or Santo Domingo?
For urgent laboratory and maintenance requirements, express air cargo (DHL/FedEx/Air Freight) delivers within 5 to 8 business days directly to Las Américas International Airport (SDQ). For high-volume production orders (pallets or containerized crucibles), maritime transit from Shanghai or Ningbo to the Port of Caucedo or San Pedro de Macorís typically takes 28 to 35 days.
Can Kemzo customize crucible geometries, wall thicknesses, and pour spouts from technical drawings?
Yes. With over 11 years of OEM/ODM manufacturing expertise, we regularly produce custom cylindrical, rectangular, and tapered crucibles, as well as multi-channel boats and vessels with custom flanges. Simply send your 2D PDF or 3D CAD drawing with required tolerances, and our engineering team will provide a feasibility review within one hour.
How are fragile fused quartz parts protected against maritime breakage during long transits?
Every component is individually sealed and surrounded by custom-molded shock-absorbing EPE foam inside reinforced internal cartons. These cartons are secured within heavy-duty, fumigated wooden cases bound with galvanized steel strapping and moisture-barrier membranes, preventing internal movement, ocean humidity penetration, and rough port handling.
Which Incoterms and international settlement currencies does your factory support?
We support multiple Incoterms to match your logistics framework, including FOB, CFR, CIF (Caucedo or Rio Haina), EXW, DDU, and Express Door-to-Door. Supported payment currencies include USD, EUR, AUD, HKD, and CNY, settled via T/T, L/C, or PayPal for sample batches.
How can our facility prevent premature devitrification of fused silica crucibles?
Devitrification (re-crystallization to cristobalite) occurs primarily above 1150°C in the presence of surface contaminants such as alkali metal ions, finger oils, or furnace dust. To ensure extended service life, handle crucibles only with clean cotton gloves, wash with dilute hydrofluoric or nitric acid followed by deionized water before heating, and ensure operating zones remain free from alkaline particulate contamination.
Request Custom Crucible Engineering & Factory Price Quotes
Submit your CAD blueprints, operating temperatures, or target batch quantities. Our senior technical engineers in Donghai will analyze your requirements and issue an itemized quotation within 1 hour.