99.99% Purity
Precision Machined Optical Windows & Quartz Components
Direct from our Donghai facility: explore high-temperature, corrosion-resistant optical wafers, tubes, and lab-grade fused quartz solutions fabricated strictly to your technical drawings.
Thermal Shock Proof
Medical Grade
Optical Flat
Semiconductor
Flanged Precision
Spectroscopy
JGS1 / JGS2 / JGS3
Engineering Overview: Optical Quartz Window Specifications
As a leading Chinese custom quartz fabricator, Zunex Quartz Products Co., Ltd. produces optical windows, viewports, and laser substrates designed for extreme electromagnetic transparency and harsh operating environments. Optical quartz windows are critical transmission elements deployed across excimer laser systems, deep-ultraviolet (DUV) photolithography, high-temperature furnace sight ports, and aerospace observation apertures.
Unlike standard borosilicate or float glass, fused quartz exhibits an exceptionally low thermal expansion coefficient (5.5 × 10⁻⁷/°C), eliminating wavefront distortions caused by thermal lensing under intensive beam irradiation. Furthermore, our CE-certified manufacturing complies with European Directives regarding industrial equipment integration, ensuring structural resilience under rapid pressure differentials and high operating stresses.
| Optical Quartz Grade | Transmission Bandwidth | OH Content | Primary Industrial Use-Case |
|---|---|---|---|
| JGS1 (Synthetic Fused Silica) | 185 nm – 2,500 nm (Deep UV) | ≤ 5 ppm (or High OH depending on laser threshold) | Excimer lasers, semiconductor stepper windows, UV spectrometry |
| JGS2 (Optical Grade Quartz) | 220 nm – 2,500 nm (UV-VIS) | ≤ 30 ppm | High-pressure sight glasses, UV sterilizer viewports, furnace windows |
| JGS3 (Infrared Grade Silica) | 260 nm – 3,500 nm (Extended IR) | ≤ 5 ppm (Water-free) | FTIR spectroscopy, pyrometry viewports, thermal imaging systems |
Every window undergoes laser-interferometric surface flatness inspection (λ/4 or λ/10 per standard), bilateral parallelism polishing down to ≤ 10 arcseconds, and double-side scratch-dig quality control aligned with MIL-PRF-13830B (20/10 to 60/40 standards).
100%
Verified Response Rate
≤ 2 Hours
Avg Engineering Review
43%
Global Repeat Order Rate
99.99%
SiO₂ Material Purity
Why Tier-1 Labs & Industrial Manufacturers Choose Us
Headquartered in Donghai County, China's silicon and crystal core, we merge abundant raw mineral purity with advanced CNC and laser processing technology.
CE & ISO Traceability
Full batch traceability from raw fused ingot selection to final spectrophotometer inspection reports, complete with formal CE conformance.
Custom to Drawing (OEM)
Direct machining from DWG, DXF, or STEP models. We support complex steps, counterbore laser holes, beveled edges, and optical coatings.
Ultra-Fast Response
Our dedicated engineering desk confirms manufacturability, tolerance tolerances (±0.02 mm), and pricing in less than two hours.
Export-Grade Cushioning
Zero-breakage assurance with multilayer shock-absorbent polymer packaging and reinforced structural wooden shipping crates worldwide.
Future Sourcing & Technological Trends in Optical Windows
As semiconductor lithography, green hydrogen, and laser manufacturing evolve, procurement criteria for quartz glass are experiencing structural shifts.
1. Transition to Laser-Assisted Cold Machining
Traditional diamond wheel grinding induces microscopic subsurface cracks (SSC) that degrade under high-power laser exposure. Modern procurement increasingly specifies picosecond laser drilling and chemical-mechanical polishing (CMP) to achieve subsurface damage thresholds below 5 μm, radically extending optical component lifetime in harsh vacuum chambers.
2. Extreme Environmental Resistance in Green Energy
The acceleration of photovoltaic cell manufacturing (TOPCon and Perovskite-Silicon tandems) and hydrogen generation systems requires quartz sight glasses and inspection windows capable of enduring aggressive halogen gases, ammonia environments, and continuous cycling past 1100 °C without devitrification or clarity loss.
3. Supply Chain Localization & Direct Factory Audits
B2B procurement teams are bypassing intermediate brokers in favor of vertically integrated factories situated in raw material clusters like Donghai. Direct manufacturer engagement guarantees material certification, lower defect scrap rates, faster design iterations, and predictable repeat-order lead times.
Frequently Asked Questions by Optical Engineers & Buyers
Everything you need to know about material selection, thermal endurance, machining limits, and international customs clearance.
What differentiates synthetic fused silica from standard fused quartz?
Synthetic fused silica (such as JGS1) is synthesized via chemical vapor deposition (CVD) of silicon tetrachloride (SiCl₄), yielding extreme chemical purity (>99.9999% SiO₂) with negligible metallic impurities. This results in superior UV transmittance extending down to 185 nm and virtually zero bubble/inclusion content. In contrast, fused quartz (such as JGS2 or natural quartz glass) is melted from natural quartz crystals; while highly thermal-shock resistant and heat resilient up to 1100 °C, it contains slight trace minerals suited for VIS-NIR optics, sight glasses, and furnace envelopes.
How does CE certification apply to industrial quartz windows?
CE marking for quartz optical components confirms compliance with relevant European safety, health, and environmental protection directives—predominantly the Pressure Equipment Directive (PED 2014/68/EU) for high-pressure sight viewports and the Machinery Directive for optical laser enclosures. This guarantees European and global system integrators that our components meet rigorous bursting pressure criteria, mechanical stress tolerances, and non-hazardous material mandates.
What geometric and surface tolerances can Zunex achieve on optical windows?
Our standard CNC and double-sided lapping facility handles outer dimensions from 2 mm up to 800 mm with dimensional tolerances down to ±0.02 mm. We reliably deliver thickness tolerances within ±0.01 mm, surface quality up to 20/10 Scratch/Dig, surface flatness of λ/4 to λ/10 @ 632.8 nm, and wedge angles/parallelism ≤ 10 arcseconds, verified by transmission wavefront interferometry.
Can your quartz windows withstand rapid cyclical temperature variations?
Yes. Due to an exceptionally low coefficient of thermal expansion (5.5 × 10⁻⁷ /°C), our clear fused quartz can be repeatedly heated to 1100 °C and plunged directly into cold water (20 °C) without structural fracture. Continuous operating temperatures should remain below 1150 °C to prevent surface devitrification (crystallization into cristobalite), though short-term excursions up to 1300 °C are fully supported.
What is the lead time for custom OEM prototypes versus production runs?
For prototype quantities (1–10 pcs) with stock material (JGS1, JGS2, JGS3), custom machining and polishing typically require 5 to 7 working days. Batch production orders (100–5,000 pcs) generally ship within 2 to 3 weeks, accompanied by dimensional measurement data sheets, material spectroscopic curves, and safe-transit wooden crating.
Request a Formal Quotation & Technical Review
Send your 2D/3D engineering drawings (PDF, DWG, STEP) or dimensional parameters. Our optical engineering team will verify manufacturability, specify optimal material grades, and return a competitive factory quote within 2 hours.
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