High-Purity Fused Silica & Fabricated Quartz Catalog
Derived from high-grade Donghai natural silica crystal deposits, our fused silica lumps and custom-fabricated laboratory quartzware undergo extreme electric-arc fusion, thermal degassing, and laser-guided machining to support County Cork's pharmaceutical processing and photonics laboratories.
High-Temperature Laboratory Quartz Flow Splitting Bottle
Corrosion-resistant custom glassware rated for 1100°C continuous service, offering >85% ultraviolet-visible light transmittance for high-precision analytical and separation columns.
SJ 135 Quartz Condensers & Purification Units
Precision-blown clear quartz condensers, separatory funnels, and waste recovery receivers with micro-machined ground joints for aggressive chemical distillation in Cork Harbour cleanrooms.
XRD Quartz Zero-Background Sample Holders
Cut along low-background crystalline orientations to eliminate diffuse X-ray scatter in crystallographic testing, powder diffraction, and thin-film spectroscopy across academic research facilities.
Precision Quartz Chemical Separating Container
Heavy-walled fused quartz reactor vessels engineered with 99.999% purity raw stock to withstand hot mineral acids (except HF) without leaching trace alkali or transition metals into pharmaceutical reagents.
SJ 140 Precision Polished Quartz Combustion Boat
Flat-bottom and semi-circular combustion carriers crafted for horizontal CVD and tube furnaces operating up to 1250°C, resisting thermal devitrification and mechanical slump under cyclical thermal loads.
High-Temperature Fused Silica Quartz Sheets
Diamond-sawn and double-sided polished observation substrates with parallel tolerances within ±0.02 mm, providing extreme thermal shock resistance ($5.5 \times 10^{-7} /^\circ\text{C}$ CTE) for vacuum furnace viewports.
SJ 126 Natural Fused Quartz Square Slides
Thin 0.5 mm to 3.0 mm polished quartz substrates optimized for UV-vis microscopy, laser transmission filters, and microfluidic chip bonding in biomedical development.
Acid & Alkali Resistant Quartz Glass Crucible
Arc-fused, high-density opaque and transparent melting bowls rated to 1450°C peak. Ideal for precious metal assaying, high-purity inorganic compound synthesis, and high-vacuum calcination.
Fused Silica Lump Metallurgy: Chemical Purity, Phase Transformation & Thermal Properties
Fused silica lump (also referred to as fused quartz chunk or vitreous silica feedstock) is created through the non-crystalline fusion of high-purity natural silica sand in specialized electric resistance or high-temperature arc furnaces exceeding 2000°C. Originating from Donghai County—the premier crystal manufacturing cluster in Jiangsu, China—our fused silica lumps serve as the foundational, defect-free raw material for precision investment casting, silicon metal refinement, photovoltaic crucible manufacturing, optical glass drawing, and advanced ceramic refractory matrices.
1. ICP-MS Elemental Trace Impurity Analysis (PPM by Weight)
The structural integrity and optical clarity of fused silica are governed by trace metallic inclusions. Transition metals such as Iron (Fe), Titanium (Ti), and Chromium (Cr) induce optical absorption bands and accelerate premature devitrification into cristobalite at sustained high temperatures, while alkali elements (Na, K, Li) dramatically degrade electrical resistivity and thermal shock thresholds. The table below represents certified ICP-MS testing thresholds across our commercial supply tiers delivered to Cork:
| Purity Grade | Total SiO₂ | Fe (Iron) | Al (Aluminum) | Ti (Titanium) | Alkali (Na+K+Li) | Heavy Metals (Cr+Cu) | Key Industrial Applications |
|---|---|---|---|---|---|---|---|
| Tier 1: Standard Fused Lump | ≥ 99.90% | ≤ 25 ppm | ≤ 60 ppm | ≤ 15 ppm | ≤ 18 ppm | ≤ 5 ppm | Refractories, Precision Investment Casting Shells, Foundry Sands |
| Tier 2: High-Purity (4N) | ≥ 99.99% | ≤ 1.5 ppm | ≤ 16 ppm | ≤ 2.0 ppm | ≤ 2.5 ppm | ≤ 0.5 ppm | Semiconductor Quartzware, Furnace Tubes, Sight Glasses |
| Tier 3: Ultra-Pure (4N5 - 5N) | ≥ 99.999% | ≤ 0.2 ppm | ≤ 5.0 ppm | ≤ 0.8 ppm | ≤ 0.6 ppm | ≤ 0.1 ppm | Photovoltaic Crucibles, Optical Fiber Preforms, Microelectronics |
2. Thermodynamic Metrics & Physical Characteristics
Fused silica possesses one of the lowest coefficients of thermal expansion among engineered technical materials, conferring near-immunity to instantaneous thermal shock. When cold fused silica is thrust directly into an oxy-hydrogen flame at 1100°C and subsequently quenched in ambient water, it exhibits zero micro-cracking due to its amorphous tetrahedral network.
| Physical Property Parameter | Metric / Engineering Value | Operating Implications for Engineering Buyers |
|---|---|---|
| Mean Coefficient of Thermal Expansion (CTE) | 5.5 × 10⁻⁷ / °C (0 – 1000°C) | Allows rapid thermal cycling without thermal fracturing or distortion. |
| Strain Point / Annealing Point | 1025°C / 1120°C | Stress-relief thresholds during hot-working and welded assembly operations. |
| Softening Point | 1683°C | Maintains structural geometry well above the melting limit of borosilicate glass. |
| Hydroxyl ([OH⁻]) Concentration | Standard: <30 ppm | Ozone-Free Doped: <5 ppm | Controls the transmission cutoff in the infrared band and optimizes mechanical viscosity. |
| Dielectric Strength (20°C, 1 MHz) | 25 – 40 kV/mm | Excellent high-frequency insulator for RF plasma etching and induction chambers. |
Localized Applications Across Cork's Industrial Hubs
From the deepwater maritime terminals in the Port of Cork to the biopharmaceutical clusters of Ringaskiddy and the research corridors of the Tyndall National Institute, high-purity fused silica lumps and custom quartz components perform critical processing tasks.
Ringaskiddy & Little Island API Biopharma Synthesis
County Cork hosts multinational pharmaceutical leaders manufacturing life-critical Active Pharmaceutical Ingredients (APIs). High-temperature quartz separation bottles, reflux condensers, and high-purity silica columns eliminate trace leachables (such as lead, arsenic, or boron) common in borosilicate apparatus, ensuring ultra-clean catalytic reactions under highly acidic environments.
Tyndall National Institute & Photonics Research
As Ireland's flagship deep-tech institute in Cork City, Tyndall drives microelectronics, nanotech, and quantum photonic integration. Our 4N5–5N optical grade fused quartz slides, XRD zero-background holders, and vacuum viewports deliver transmission rates beyond 92% across the deep-UV (190 nm) through near-infrared spectrum, preserving laser beam coherence.
Munster Advanced Foundry & Precision Investment Casting
Industrial foundries serving aerospace and precision automotive sectors in the South-West of Ireland rely on graded fused silica lumps crushed into flour and grain matrices. The negligible thermal expansion prevents shell buckling during metal pouring, while easy chemical leaching via hot caustic washes ensures spotless internal turbine passages.
Specialty Chemical & High-Purity Solvent Processing
Chemical processing installations around Cork Harbour utilize arc-fused silica lumps for thermal bed packing, acid recovery towers, and reaction catalyst carriers. The unreactive SiO₂ surface withstands corrosive sulfurous and nitrogenous atmospheres at elevated operating temperatures without degradation.
Photovoltaic & Green Energy Clean-Tech Manufacturing
With Ireland accelerating toward net-zero targets under the Cork 2040 spatial plan, regional innovators in solar cells and energy storage leverage fused silica lumps as pure crucibles and furnace liners for pulling monocrystalline silicon ingots with low oxygen micro-defects.
Port of Cork Direct Multi-Modal Freight Integration
By coordinating bulk containerized shipping routes through Ringaskiddy Deepwater Port and multimodal European hubs, we provide reliable sea-freight transit times for palletized fused silica big-bags and specialized wooden crates, bypassing UK landbridge customs friction.
Strategic Supply Chain Trends Impacting Cork Procurement
Irish procurement officers face changing trade regulations, EU REACH/RoHS environmental directives, and logistical realignments that dictate direct partnerships with primary Chinese manufacturers.
1. De-risking European Intermediary Markups
Traditionally, Irish industrial labs and foundries purchased fused silica chunks and precision quartz tubes through continental European trading houses in Germany, the Netherlands, or the UK. However, rising distributor margins and post-Brexit customs documentation costs have driven procurement managers in Munster to source directly from Donghai, China—securing direct factory pricing, tailored lump grain fractionation, and immediate access to original mill certificates.
2. Strict Compliance with EU REACH & RoHS Standards
Cork's biopharma and electronic sectors operate under strict environmental oversight governed by the Health and Safety Authority (HSA) and European Chemicals Agency (ECHA). Our fused quartz products are thoroughly certified RoHS-compliant and free of heavy metals (Cadmium, Lead, Mercury, Hexavalent Chromium), ensuring smooth import clearance through Irish Customs at Ringaskiddy and Dublin Port.
3. Growing Demand for Sub-Micron Precision in Quartzware
With the expansion of Ireland's semiconductor and photonics innovation ecosystems, standard lab glass tolerances (±0.5 mm) are no longer sufficient. Research facilities in Cork require optical-grade surface roughness (Ra < 0.5 nm), parallel tolerances within ±0.01 mm, and controlled bubble-free classifications (DIN 3140 / ISO 10110), demanding computerized 5-axis CNC ultrasonic cold-machining facilities.
4. Port of Cork Ringaskiddy Infrastructure Advantage
The multi-million-euro expansion of the Cork Container Terminal (CCT) in Ringaskiddy allows deep-draft post-Panamax feeder vessels to dock directly in Cork Harbour. Bulk shipments of fused silica lumps packed in 1-ton moisture-proof FIBC big bags or steel drums can be routed directly to Munster without cross-docking delays through inland Irish road freight.
Why Cork Engineers Rely on Vulra Quartz
Combining primary mining raw materials from Donghai County with rigorous engineering validation, we deliver fused silica materials and custom components that meet demanding industrial specifications.
Donghai Geolocation Asset
Situated in the heart of China's silica capital, we possess captive access to natural crystal quartz deposits, guaranteeing raw material security, purity consistency, and cost control across market cycles.
TÜV Rheinland Assessed
Our production facilities, testing protocols, legal status, and manufacturing operations are on-site audited and verified by TÜV Rheinland, offering verified reliability for international B2B contracts.
Drawing-Based OEM/ODM
From a 1-piece laboratory prototype to recurring full-container procurement, our CAD/CAM engineers review drawings for wall thickness ratios, joint stress, and thermal durability prior to processing.
Integrated Processing Lines
Both hot flame working (welding, dome closing, tube bending) and diamond cold machining (ultrasonic drilling, surface grinding, optical lapping) take place under one roof with in-house annealing lehrs.
Cork Sourcing FAQ
Get technical and logistical clarity regarding imported fused silica lumps, lump size fractions, customs clearance at Port of Cork, and chemical verification procedures.
What lump particle size fractions are available for export to Ireland?
We supply raw electric-arc fused silica in standard lumps (20–100 mm and 10–50 mm) for remelting and metallurgical alloy production, as well as jaw-crushed, screened, and demagnetized granules (0–1 mm, 1–3 mm, 3–5 mm, 4–10 mm) and fine 200–400 mesh flours designed for ceramic foundry investment casting. Custom particle size distribution (PSD) curves are available upon request.
How do you prevent moisture absorption and contamination during ocean freight to Cork?
Fused silica lumps are double-packed in heavy-duty polyethylene inner liners heat-sealed inside multi-layered woven polypropylene FIBC big bags (1 metric ton or 1.25 metric ton bags) or hermetically sealed steel drums with desiccant packs. Bag fabrics resist UV exposure, and wooden pallets are heat-treated per ISPM-15 standards for Irish phytosanitary customs entry.
What documentation is provided to satisfy Irish customs and quality audits?
Every commercial consignment arrives with an authentic batch-specific Certificate of Analysis (CoA) listing comprehensive ICP-MS trace elemental analysis (Fe, Al, Ca, Mg, Ti, Na, K, Li), X-ray diffraction (XRD) phase purity reports confirming amorphous silica content ≥ 99.8%, EU REACH conformity dossiers, RoHS test results, Bill of Lading, and customized packing manifests.
Can I request a sample lump or trial batch before placing a full-container order?
Yes. For material evaluation, spectroscopic testing, and crucible pilot runs, we provide 5 kg to 50 kg evaluation samples shipped via express air freight (DHL/FedEx) arriving in Cork within 5–7 business days. For customized fabricated quartzware (such as combustion boats or sight glasses), we accept 1-piece sample prototype orders before volume production.
What is the devitrification temperature of your fused silica in continuous use?
Our fused silica exhibits continuous thermal performance up to 1100°C without phase transformation. Devitrification—the nucleation of amorphous SiO₂ into crystalline beta-cristobalite—typically begins around 1150°C to 1200°C, especially in the presence of surface alkali contaminants or moisture. In clean, inert, or vacuum atmospheres, short-term operating peaks can reach 1450°C without mechanical slumping.
How do you manage transit insurance and fragile logistics for fabricated quartzware?
All finished quartz items undergo multi-point ultrasonic cleaning, individual bubble-encapsulation, high-density polyethylene custom foam nesting, and double-walled corrugated boxing suspended inside reinforced plywood export crates. Consignments are insured under full marine cargo clauses (Institute Cargo Clauses A), guaranteeing cost coverage in the event of handling damage.
Accelerate Your Cork Quartz Supply Chain Today
Connect directly with our senior quartz engineering team in Donghai. Request a customized quotation, submit technical drawings for feasibility analysis, or schedule a certified ICP-MS purity audit for your fused silica lump requirement.