High Temp Transparent Polished Ozone Free Closed End Quartz Tube
Diameter: 5 – 800 mm
SiO₂ Purity: ≥ 99.99%
Thermal Range: Up to 1100°C Cont.
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Factory Direct Catalog
Featured Precision Quartz Products
Manufactured from natural and synthetic high-purity crystalline quartz sand in Donghai, certified for thermal stability up to 1450°C and deep optical transmission.
Custom High Purity Quartz C-Shaped Small BET Reaction Tube
Configuration: C-Bending / Precision
Application: BET Surface Analyzer
Tolerance: ±0.05 mm Custom
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High Thermal Conductance Circular Quartz Disc & Heat Exchange Chips
Melting Point: 1750°C Refractory
Shape: Ground / Polished Disc
Resistance: Extreme Thermal Shock
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SJ-126 Precision Optical Fused Quartz Slide & Inspection Window
Optical Clarity: JGS1 / JGS2 UV-VIS
Thickness: 0.2 – 20 mm Custom
Surface Finish: 60/40 or 40/20 Scratch
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Clear Refractory Fused Quartz Crucible Bowl for Semiconductor Fabs
Softening Point: 1683°C Certified
Tensile Strength: 48 N/mm² Nominal
Purity: Trace Metals < 15 ppm
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Ultra-Thin Optical Grade Circular Quartz Testing Disc (SJ-077)
Geometry: Circular Disc 10–300mm
Parallelism: < 30 Arc Seconds
Transmittance: > 92% at 200–2500nm
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High-Purity 99.999% Single Crystal Quartz Tube Flange & Port Container
Purity Standard: 5N (99.999% SiO₂)
Machining: CNC Flange Grooving
Sealing: O-Ring Vacuum Compatible
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SJ-135 Semiconductor Grade Quartz Condenser & Separation Column
Fabrication: Precision Hot Welding
Cleanliness: Cleanroom Decontaminated
Chemical Class: Hydrofluoric-Proof (Class 1)
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Fused Quartz Disc Engineering: Materials Science Whitepaper
Fused quartz discs, wafers, and circular optical sight windows represent the pinnacle of amorphous silica engineering. Unlike standard borosilicate, soda-lime, or aluminosilicate glass, fused quartz consists almost entirely of pure silicon dioxide (SiO₂ ≥ 99.99% to 99.999%). The three-dimensional tetrahedral lattice of silicon-oxygen covalent bonds confers extraordinary thermal stability, exceptional ultraviolet-to-near-infrared optical transparency, nearly zero thermal expansion, and unmatched chemical inertness. For Philippine semiconductor packaging plants, high-precision analytical laboratories, chemical process plants, and clean energy developers, selecting the proper grade of fused quartz disc is crucial to avoiding catastrophic equipment downtime, thermal fracturing, and elemental batch contamination.
| Physical / Chemical Property | Standard Natural Fused Quartz (JGS2) | Optical Grade Fused Silica (JGS1) | Infrared Grade Fused Quartz (JGS3) |
|---|---|---|---|
| Primary Raw Material | Donghai Natural Quartz Crystal Sand | Synthetic SiCl₄ Precursor Gas | Vacuum-Melted Quartz Crystal Sand |
| Silicon Dioxide (SiO₂) Purity | ≥ 99.99% (4N) | ≥ 99.9999% (6N) | ≥ 99.995% (4.5N) |
| Hydroxyl (OH⁻) Content | 150 – 200 ppm | ≤ 1000 – 1200 ppm | ≤ 5 ppm (Water-Free IR Optimized) |
| Coefficient of Thermal Expansion (CTE) | 5.5 × 10⁻⁷ / °C (20°C – 320°C) | 5.2 × 10⁻⁷ / °C | 5.5 × 10⁻⁷ / °C |
| Continuous Operating Temperature | 1100 °C | 1150 °C | 1100 °C |
| Short-Term Max Temperature Peak | 1450 °C | 1500 °C | 1450 °C |
| UV Transmission (200 – 280 nm) | 70% – 85% | ≥ 92% (Excimer / Deep-UV) | Low / Cut-off below 260 nm |
| IR Transmission (2600 – 3500 nm) | Strong absorption dip at 2.73 μm | Strong OH absorption dip | ≥ 88% Flat continuous band |
Our manufacturing facility, Lianyungang Vulra Quartz Products Co., Ltd., is situated in Donghai County, Jiangsu Province—internationally recognized as the silicon and crystal capital of China. With on-site direct access to refined crystal quartz sand deposits and modern synthetic refining facilities, we maintain end-to-end control over material stoichiometry, trace metallic ion distribution (such as Fe, Al, Ti, Ca, and Na kept strictly below critical ppm thresholds), and bubble-free ingot melting. Every quartz disc supplied to our Philippine partners undergoes fine diamond core-drilling, surface double-sided lap grinding, high-precision chemical-mechanical planarization (CMP), and laser-guided fire polishing.
Industrial Alignment
Localized Applications Across Philippine Industries
From automated cleanrooms in Laguna and Cavite to geothermal well monitoring in the Visayas, our fused quartz discs resolve mission-critical thermal and chemical challenges.
Semiconductor OSAT & Electronics Assembly
The Philippines accounts for a significant portion of global semiconductor back-end assembly and testing. Fused quartz discs are widely utilized as wafer carriers, UV cure exposure stages, plasma etch sight windows, and high-temperature vacuum chamber viewports where low outgassing and sub-micron surface planarity are mandatory.
Hubs: Laguna Technopark, Carmelray, Clark Freeport
Mining Assay & Spectroscopic Laboratories
For precious and base metal assay testing across nickel and copper operations, optical-grade circular quartz discs serve as corrosion-proof X-ray fluorescence (XRF) cell windows, infrared pyrometer barriers, and digestion vessel observation ports resistant to fuming nitric, hydrochloric, and sulfuric acids at extreme heat.
Hubs: Caraga Region (Surigao), Cebu, Benguet
Geothermal Borehole & Turbine Sight Glasses
As one of the world's leading geothermal energy producers, Philippine thermal power installations encounter high-pressure geothermal brine containing dissolved hydrogen sulfide and silica. High-thickness tempered quartz discs serve as durable high-pressure sight glasses enduring continuous 250°C–400°C operating surges.
Hubs: Leyte (Tongonan), Negros Oriental, Batangas
Industrial Pyrometry & Heat Treatment
Commercial glass annealing, steel processing, and ceramic tile manufacturing plants in Bulacan and Cavite rely on custom-machined quartz discs as heat-shielding viewports. Quartz's minimal expansion ensures immediate resistance to thermal shock when transitioning from ambient shop-floor temperatures to furnace chambers above 1000°C.
Hubs: Calamba, Batangas Industrial Corridor, Bulacan
University R&D, Photocatalysis & Laser Testing
Advanced physics, chemistry, and materials science institutions deploy high-purity synthetic fused quartz discs for UV photolysis cells, BET surface area analyzers, laser collimator optics, and photoelectrochemical cells requiring spectral clarity from 190 nm to deep UV without background fluorescence.
Hubs: Metro Manila (UP Diliman, DLSU, UST, DOST)
Municipal & Industrial UV Water Disinfection
Large-scale municipal water treatment, food and beverage processing, and pharmaceutical cleanroom systems in the National Capital Region (NCR) utilize transparent ozone-free fused quartz discs and custom disc-end sleeves to transfer 254 nm germicidal UV irradiation into high-flow fluid lines without solarization or degradation.
Hubs: Metro Manila, San Fernando (Pampanga), Davao
Strategic Procurement
Philippine Market Trends & Supply Chain Realities
Navigating the commercial, logistical, and statutory landscape of sourcing high-precision fused quartz components from mainland China into Philippine Special Economic Zones.
PEZA Zone Integration & Zero-VAT Purchasing
The continuous growth of Philippine Economic Zone Authority (PEZA) accredited industrial parks in Laguna, Cavite, and Batangas has driven strong demand for direct-from-manufacturer precision quartz. PEZA locators benefit from expedited import tax clearance and automated zero-VAT documentation. Vulra Quartz provides comprehensive export invoicing, Certificates of Origin (Form E under ASEAN-China FTA), and clean technical packing lists to streamline green-lane customs clearance at NAIA and the Port of Manila.
Shift from Standard Borosilicate to Fused Silica
Local assembly facilities have increasingly migrated away from traditional borosilicate glass viewports toward fused quartz discs. Borosilicate begins softening near 500°C–550°C and degrades when exposed to aggressive alkaline vapors and halogen acids. Engineering teams in Calabarzon now mandate fused quartz discs for furnace upgrades due to their 1100°C continuous thermal threshold, avoiding unplanned production stoppages and wafer contamination.
Climate-Engineered Export Logistics
The Philippines experiences an average relative humidity of 75% to 88% throughout the monsoon season. Standard overseas freight of optical quartz components can suffer from humidity-induced surface hazing or salt crystallization during sea transit. Vulra Quartz executes climate-controlled export protocols: individual ultrasonic DI cleaning, vacuum-sealed polyethylene moisture-barrier envelopes with activated silica desiccants, foam-isolated shock cavities, and crating in fumigated export-grade wooden cases.
Why Vulra Quartz
Enterprise Advantages: Precision, Verification, Capacity
Headquartered in Donghai, China, Lianyungang Vulra Quartz Products Co., Ltd. blends mineral resource superiority with advanced German-calibrated glass machining.
01
TÜV Rheinland On-Site Verified
Audited on-site by TÜV Rheinland. Our business registration, cleanroom workshop footprint, advanced production lathes, and quality management systems are authenticated for full international OEM/ODM compliance.
02
Donghai Crystal Raw Material Base
Located in the heart of China's quartz capital, we secure priority access to natural crystal sand and raw feedstock. This geographic advantage guarantees consistent lot-to-lot purity (≥99.99%) at competitive pricing.
03
Drawing-Based Custom Machining
We work from your CAD, STEP, or PDF drawings. Capabilities include diamond core drilling, beveling, step flange milling, counter-boring, slotting, optical polishing (λ/4 wave flatness), and laser serialization.
04
Single-Piece Prototype to Mass Supply
We maintain an agile manufacturing workflow. Support ranges from single-piece custom prototypes for academic and R&D validation up to scheduled container-load batch supply for large-scale equipment manufacturers.
Integrated Hot Working and Precision Cold Machining Under One Roof
Unlike basic trading brokers, Vulra Quartz operates complete downstream processing lines. Our cold machining department executes multi-axis CNC milling, high-pressure waterjet profiling, flat polishing, and edge grinding with tolerances within ±0.05 mm. Our hot working department features automated glass lathes and oxy-hydrogen torches capable of welding quartz flanges directly to tubes, flaring bell mouths, dome sealing, and stress-relief annealing up to 1250°C. Every manufactured quartz disc is visually inspected under polariscopes to verify the total elimination of internal residual stresses, ensuring structural integrity during cyclic thermal loads.
Buyer Knowledge Base
Philippine Procurement: Frequently Asked Questions
Common inquiries from purchasing officers, quality engineers, and plant managers across the Philippines.
How are quartz shipments delivered to the Philippines, and what are typical transit times?
We provide door-to-door express courier (DHL, FedEx, UPS) for urgent prototypes and replacement discs, delivering to Metro Manila, Laguna, Cavite, and Clark within 3 to 5 business days. For volume manufacturing orders, air cargo reaches Ninoy Aquino International Airport (NAIA) or Clark (CRK) within 2 to 4 days, while consolidated LCL/FCL ocean freight from Lianyungang/Shanghai port to Manila South Harbor, Batangas, or Cebu Port takes approximately 10 to 14 days.
Can you provide Form E for preferential tariff clearance under ACFTA?
Yes. As a registered Chinese manufacturer and exporter, we issue official ASEAN-China Free Trade Area Preferential Tariff Certificates of Origin (Form E). This documentation enables Philippine importers and PEZA-registered enterprises to claim zero or substantially reduced customs duty rates under Philippine Bureau of Customs (BOC) regulations.
What is the difference between JGS1, JGS2, and JGS3 quartz discs for optical applications?
JGS1 is synthetic fused silica with zero bubbles, offering over 90% transmission in the deep UV band (185–2500 nm), optimal for laser windows, lithography, and photolithography. JGS2 is melted natural quartz for standard UV-VIS applications (220–2500 nm), commonly used in viewports, pyrometers, and sight glasses. JGS3 is vacuum-melted with minimal OH content (≤5 ppm), specifically engineered for infrared applications across the 260–3500 nm spectrum without water-absorption dips.
Can a fused quartz disc withstand rapid thermal cycling without cracking?
Yes. Due to an exceptionally low coefficient of thermal expansion (5.5 × 10⁻⁷ / °C), fused quartz demonstrates remarkable thermal shock resistance. A standard 3 mm to 10 mm thick quartz disc can be heated to 1100°C and plunged into 20°C cold water without shattering. This makes it ideal for Philippine furnace sight ports and sudden pressure surges in geothermal steam pipelines.
How do you safeguard fragile, thin quartz discs from breakage during long-haul shipment?
We follow strict multi-tier export packaging: each disc is wrapped in acid-free lens paper, encased in static-dissipative bubble sleeves, sealed inside moisture-barrier pouches with desiccant, and nested into custom high-density pearl cotton (EPE) matrix cutouts. Exterior packaging uses reinforced double-corrugated cartons and plywood crates, with drop-sensor and fragile labels affixed.
What is the minimum order quantity (MOQ) for custom-dimension quartz discs?
For custom-dimension discs, ground wafers, sight windows, and flanges machined to customer CAD drawings, our MOQ is just 1 piece. This low barrier allows Philippine design engineers and plant maintenance supervisors to test fit, optical transmittance, and thermal performance before approving full batch production runs.