What information do you need to engineer a custom quartz tube or component?

Please send outer and inner diameter (or wall thickness), length, required tolerances, end configuration (open, closed, flanged, ground joint or welded fittings), material grade (transparent or opaque fused quartz), working temperature and atmosphere, annual or batch quantity, and a drawing in PDF, DWG or STEP format. Complete data lets our engineers confirm manufacturability and lead time in a single review.

How does Southeast Quartz verify quality before shipment?

Products undergo helium mass-spectrometry leak detection, pressure resistance testing and purity testing before leaving the factory, together with dimensional inspection against the customer drawing, to ensure stable performance with no impurities and no leakage.

Can you manufacture oversized quartz tubes and non-standard quartz shapes?

Yes. Our workshop combines flame hot-working with CNC cold machining, so we produce oversized fused quartz tubes, bell jars, slotted quartz boats, flanged reactors, irregular shaped quartz sheets and fully customized quartz instruments according to customer equipment parameters.

Where is Southeast Quartz located and which markets do you export to?

Our factory is at No. 1 Qingsheng Rd., Qinghu Industrial Park, Donghai County, Jiangsu, China, within China's best-known crystal and quartz industrial cluster. Besides customers throughout China, we export to Europe, the Americas, Southeast Asia and the Middle East.

High-Quality Quartz Glass Plate Factories & Product

Q: What is the maximum operating temperature of fused quartz?

Transparent fused quartz typically supports continuous service around 1,100 °C and short exposures up to roughly 1,250 °C, with a softening point near 1,683 °C. Real limits depend on grade, load, atmosphere and cycle time. Above about 1,100 °C, surface contamination such as alkali residue from skin contact accelerates devitrification, so quartzware should be cleaned and handled with clean gloves before firing.

Factory Showcase

Precision High-Temperature Quartz Solutions

Engineered for mission-critical applications across semiconductor wafer diffusion, industrial thermal isolation, and spectral analysis.

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Executive Summary

High-Purity Quartz Glass Plates: Material Evolution & Market Drivers

A rigorous examination of synthetic and fused quartz substrates under severe plasma, thermal, and optical stress.

Extreme Thermal Resilience

Standard fused quartz glass plates exhibit an extraordinarily low thermal expansion coefficient of approximately 5.5 × 10⁻⁷/K. This imparts exceptional thermal shock resistance, enabling continuous operations at 1,100°C and transient thresholds reaching 1,250°C without mechanical rupture, crystallization, or deformation in dynamic heat sinks.

Broadband Spectral Clarity

From Deep Ultraviolet (DUV 190 nm) to Mid-Infrared (MIR 3500 nm), high-purity optical fused quartz plates maintain transmission rates exceeding 92% (without anti-reflective coatings). The absence of hydroxyl (OH⁻) ions or metallic inclusions suppresses micro-bubble scatter and solarization under extreme UV lithography and laser radiation.

Chemical Inertness & Plasma Etch

Composed of ≥99.99% silicon dioxide (SiO₂), these plates withstand aggressive halogen chemistry, including hydrogen fluorine, chlorine etching gases, and nitric acid. Semiconductor manufacturers rely on fused silica plates for wet-bench etching, chemical vapor deposition (CVD), and physical vapor deposition (PVD) liners.

Key Thermodynamic & Optical Parameters

Physical / Chemical Property	Testing Standard	Standard Fused Silica	Semiconductor-Grade JGS1 / JGS2
Silicon Dioxide Purity (SiO₂)	ICP-OES / GD-MS	≥ 99.99%	≥ 99.999% (5N)
Density (20°C)	ASTM C693	2.20 g/cm³	2.203 g/cm³
Coefficient of Thermal Expansion (CTE)	0°C - 300°C	5.5 × 10⁻⁷ / K	5.2 - 5.4 × 10⁻⁷ / K
Softening Point / Annealing Point	ASTM C338	1,683°C / 1,215°C	1,730°C / 1,250°C
Transmittance (200nm - 2500nm)	Spectrophotometer	≥ 90%	≥ 93.5% (DUV Optimized)
Hydroxyl Radical Content (OH⁻)	FTIR Transmission	< 30 ppm	< 5 ppm (Dry Fused Silica)

Factory Milestones

Integrated Manufacturing Infrastructure: Donghai Hub

Combining flame-fusion hot forming with multi-axis CNC cold machining to fulfill high-tolerance orders worldwide.

2015

Year Established

10+

Years Engineering Experience

100+

Specialized Technicians

200+

Proprietary Utility Patents

Plasma Melting

High-yield plasma and hydrogen-oxygen flame melting eliminates internal bubbles, striations, and particulate seeds.

5-Axis CNC Milling

Ultrasonic-assisted cold grinding, chamfering, laser drilling, and precision slotting to tolerances within ±0.01 mm.

Optical Double-Lap Polishing

Chemical-mechanical polishing (CMP) achieves surface roughness Ra < 0.5 nm, with surface quality reaching 20/10 Scratch-Dig.

Helium Leak Verified

All fabricated hollow arrays and pressure-bearing quartz components undergo rigorous mass-spectrometry leak detection.

Industrial Solutions

Macro-Industry Sourcing & Integration Strategies

Addressing supply chain vulnerabilities, quality inconsistencies, and engineering challenges faced by international enterprises.

Semiconductor Fab Consumables

Challenge: Wafer breakage and metal trace contamination in sub-14nm lines during high-heat oxidation and LPCVD steps.

Our Strategy: We supply raw-material certified synthetic quartz plates and boats with iron (Fe), copper (Cu), and alkali limits below 0.1 ppm. Cleanroom acid bath passivation and high-purity nitrogen baking ensure low-outgassing surfaces before packaging.

Photovoltaic TOPCon & HJT Lines

Challenge: Excessive bowing and devitrification of thermal process plates under prolonged 1,200°C phosphorus oxychloride diffusion.

Our Strategy: Advanced thermal-stress relief annealing minimizes residual internal birefringence below 10 nm/cm. This significantly extends quartz component life cycles, lowering the total cost of ownership (TCO) in GW-scale gigafactories.

Aerospace & Laser Optics

Challenge: Wavefront distortion and high thermal lensing during high-power kilowatt fiber laser transmission.

Our Strategy: Precision double-sided planetary polishing controls flatness to λ/4 at 632.8 nm and parallelism to < 30 arc seconds, ensuring negligible beam dispersion and optimal thermal stability across optical windows.

Compliance & Assurance

Localized Engineering Support & Global Regulatory Compliance

A resilient manufacturing framework built on traceability, standardized testing, and seamless cross-border logistics.

Certifications & Material Traceability

Every batch of quartz glass plates is accompanied by mill test certificates (MTC), GD-MS elemental purity analysis reports, and RoHS/REACH compliance documentation. We adhere to rigorous ISO 9001 quality management procedures to eliminate batch-to-batch variations.

Vacuum Shockproof Packaging

Precision-ground quartz plates are prone to surface abrasion and micro-cracking during long-distance transport. We utilize Class 100 cleanroom packaging, anti-static polyolefin films, vacuum-sealed multi-layer air suspension boxes, and ISPM 15 compliant crates for safe international shipping.

Bilingual DFM Engineering Support

Our dedicated design-for-manufacturability (DFM) team operates across European, American, and Asian business hours. From evaluating 3D CAD/STEP geometries to advising on flame-polishing versus optical-lapping, our engineers deliver formal feasibility reviews within 24 hours.

Future Horizon

Technology Roadmap: Next-Generation Fused Silica

Strategic R&D milestones addressing the demands of advanced lithography, quantum processing, and space-grade optics.

STAGE 1: 2026–2027

Chemical Purity 6N Scaling

Implementing continuous plasma purification systems to reduce total heavy metal contamination below 5 ppb. This advancement directly targets EUV photomask substrates and next-generation atomic layer deposition (ALD) process chambers.

STAGE 2: 2027–2028

Oversized Ultra-Thin Plates

Developing continuous hot-draw and precision thinning capabilities for 800mm × 800mm quartz plates with thicknesses under 0.3mm. These will serve as protective windows for large-format flat panel displays and aerospace photovoltaic arrays.

STAGE 3: 2028–2030

Hybrid Quartz-Ceramic Composites

Synthesizing tailored fused silica matrices with silicon carbide (SiC) and silicon nitride (Si₃N₄) boundary layers. This hybrid engineering improves plasma-erosion resistance threefold for 2nm semiconductor etching environments.

Procurement Guide

Frequently Asked Questions: Specifications & Ordering

Clear engineering guidance to simplify your quartz plate and custom quartzware purchasing process.

What parameters are needed for a custom quartz plate quote?

To provide an accurate engineering review and quotation, please share the following specifications:

Physical Geometry: Outer dimensions (Length, Width, Diameter) and thickness, along with acceptable tolerances (e.g., ±0.05 mm).
Material Grade: Transparent or opaque fused quartz, optical JGS1 (Deep UV), JGS2 (Standard Optical), or JGS3 (Infrared).
Surface Quality: Commercial polish, fire polish, or optical lap (such as 60/40 or 20/10 Scratch-Dig, Ra < 1 nm).
Edge Work: Ground edges, chamfered (e.g., 0.5 mm × 45°), pencil edge, or fire-polished edges.
Operating Conditions: Continuous service temperature, thermal cycling speeds, working atmospheric pressure, and chemical exposure profiles.
Engineering Files: Drawings in 2D (PDF, DWG, DXF) or 3D models (STEP, IGES).

What is the maximum operating temperature of fused quartz glass plates?

Transparent fused quartz plates offer a continuous operating threshold of roughly 1,100°C and can withstand peak exposures of up to 1,250°C for brief durations. The material's softening point is approximately 1,683°C. Above 1,150°C, direct surface contamination from alkaline salts (such as unwashed fingerprints) accelerates devitrification (cristobalite crystal growth). For long component life, proper cleaning and handling with lint-free cleanroom gloves before firing is essential.

How do JGS1, JGS2, and JGS3 optical quartz grades differ?

These international fused silica grades are differentiated primarily by raw material origin and transmission spectrum:

JGS1 (Synthetic Fused Silica): Ultra-high purity synthesized from silicon tetrachloride (SiCl₄). Free from bubbles and inclusions, it provides exceptional deep-ultraviolet (DUV) transparency down to 185 nm without solarization.
JGS2 (Fused Natural Quartz): Melted from premium natural crystal sands. It delivers strong optical transmission across the visible and near-ultraviolet spectrum (220 nm – 2,500 nm), making it cost-effective for standard sight glasses and optical windows.
JGS3 (Infrared Optical Quartz): Vacuum-melted to minimize hydroxyl radicals (OH < 5 ppm). It provides clear optical transmission through the near-to-mid infrared band (up to 3,500 nm), eliminating water-absorption dips at 2.73 μm.

How does Southeast Quartz ensure quality control and defect-free supply?

Our quality assurance program is integrated directly into manufacturing:

Incoming crystal feedstock is checked for purity using inductively coupled plasma mass spectrometry (ICP-MS).
Internal stress birefringence is measured using automated laser polariscopes.
Dimensions and surface flatness are verified via laser coordinate measuring machines (CMM) and Zygo optical interferometers.
All hollow components and sealed vessels undergo helium mass-spectrometry leak detection to ensure helium leak tightness down to 1 × 10⁻⁹ mbar·L/s.

What is your production capacity and standard turnaround time?

Located in the Donghai quartz cluster, Southeast Quartz maintains extensive inventories of raw quartz ingots, plates, and tubes. Standard prototyping and small-batch orders are typically fabricated, inspected, and dispatched within 7 to 10 working days. High-volume manufacturing programs (thousands of units per month) are scheduled with rolling deliveries backed by localized buffer stocks.

Product Matrix

High-Purity Quartz Glass & Component Catalog

Explore our full range of furnace tubes, custom micro-channel cells, and high-purity quartzware.

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24-Hour Engineering Turnaround

Initiate Your Custom Quartz Plate Engineering Review

Send your CAD drawings, dimensional limits, or operating conditions to our technical team. We evaluate thermal tolerances, recommend suitable fused silica grades, and issue competitive factory-direct pricing within one business day.

Email Engineering Team Request Technical Catalog