High Temperature Resistant Quartz Sight Glass for Industrial Viewing Windows -TOQUARTZ®
These viewing windows provide superior optical clarity for monitoring furnaces, vacuum chambers, and chemical reactions.
Key Features of Quartz Sight Glass
TOQUARTZ® quartz sight glasses are engineered from high-purity quartz material, offering exceptional performance characteristics for demanding industrial applications where visual monitoring is critical:
Extreme Temperature Resistance
Withstands temperatures up to 1450°C with exceptional thermal shock resistance, allowing for reliable monitoring in high-temperature furnaces and thermal processing equipment.
Optical Properties
Transmits far ultraviolet, visible, and near-infrared spectra with excellent clarity, providing accurate visual monitoring of industrial processes and reactions.
High Purity Material
Manufactured from 99.99% pure SiO₂, ensuring consistent performance and minimal contamination for sensitive applications.
Chemical Resistance
Non-toxic and highly resistant to chemical corrosion, including acids, alkalis, and molten salts, making it ideal for chemical reactors and processing equipment.
- 99.99% SiO₂ Purity
- UV-Visible-IR Transparency
- Superior Chemical Stability
Available Dimensions of Quartz Sight Glass
Size of Round Quartz Sight Glass
| Round Quartz Sight Glass | |||
| Model | Diameter (mm) | Thickness (mm) | SiO₂ (%) |
| AT-SY-SJ001 | 10 | 2 | 99.99 |
| AT-SY-SJ002 | 35 | 5 | 99.99 |
| AT-SY-SJ003 | 50 | 5 | 99.99 |
| AT-SY-SJ004 | 50 | 8 | 99.99 |
| AT-SY-SJ005 | 55 | 5 | 99.99 |
| AT-SY-SJ006 | 55 | 10 | 99.99 |
| AT-SY-SJ007 | 60 | 5 | 99.99 |
| AT-SY-SJ008 | 60 | 10 | 99.99 |
| AT-SY-SJ009 | 65 | 5 | 99.99 |
| AT-SY-SJ010 | 70 | 5 | 99.99 |
| AT-SY-SJ011 | 80 | 3 | 99.99 |
| AT-SY-SJ012 | 80 | 8 | 99.99 |
| AT-SY-SJ013 | 95 | 8 | 99.99 |
| AT-SY-SJ014 | 100 | 8 | 99.99 |
| AT-SY-SJ015 | 120 | 10 | 99.99 |
| AT-SY-SJ016 | 150 | 8 | 99.99 |
| AT-SY-SJ017 | 150 | 20 | 99.99 |
| AT-SY-SJ018 | 175 | 20 | 99.99 |
| AT-SY-SJ019 | 200 | 20 | 99.99 |
| AT-SY-SJ020 | 200 | 30 | 99.99 |
| AT-SY-SJ021 | 250 | 20 | 99.99 |
| AT-SY-SJ022 | 250 | 30 | 99.99 |
| AT-SY-SJ023 | 300 | 1-30 | 99.99 |
Size of Rectangular Quartz Sight Glass
| Rectangular Quartz Sight Glass | ||||
| Model | Length (mm) | Width (mm) | Thickness (mm) | SiO₂ (%) |
| AT-SY-SJ024 | 20 | 10 | 2 | 99.99 |
| AT-SY-SJ025 | 50 | 30 | 5 | 99.99 |
| AT-SY-SJ026 | 80 | 50 | 5 | 99.99 |
| AT-SY-SJ027 | 80 | 50 | 8 | 99.99 |
| AT-SY-SJ028 | 80 | 50 | 10 | 99.99 |
| AT-SY-SJ029 | 100 | 80 | 5 | 99.99 |
| AT-SY-SJ030 | 150 | 100 | 5 | 99.99 |
| AT-SY-SJ031 | 200 | 120 | 10 | 99.99 |
| AT-SY-SJ032 | 500 | 400 | 1-30 | 99.99 |
TOQUARTZ® Solving Challenges with Quartz Sight Glass
Quartz Sight Glass for Industrial Furnace Monitoring
Key Advantages
- Maintains structural integrity after 1000+ thermal cycles between 25°C and 1200°C, verified by in-house thermal shock testing.
- Engineered with a fracture modulus exceeding 350 MPa, reducing breakage risk under rapid temperature fluctuations.
- Surface flatness ≤0.02mm ensures uniform stress distribution under radiant heat exposure, minimizing thermal distortion.
- Custom edge beveling (45°±2°) reduces micro-crack propagation in high-vibration furnace environments.
TOQUARTZ® solution
Conventional glass fails after repeated thermal cycling, causing unplanned shutdowns.
TOQUARTZ® quartz sight glass withstands over 1000 thermal cycles at 1200°C without cracking, reducing furnace downtime by over 80% annually.
Quartz Sight Glass for Chemical Processing Equipment
Key Advantages
- Proven resistance to 98% sulfuric acid and 40% sodium hydroxide at 90°C for 72 hours with no surface degradation (ASTM C279 test).
- Surface roughness Ra ≤ 0.8μm minimizes chemical residue adhesion, improving long-term optical clarity in corrosive environments.
- No alkali ion migration under prolonged exposure to HF gas, verified by EDS analysis after 500-hour test.
- Available in JGS3 grade with <5 ppm metallic impurities, reducing contamination risk in high-purity chemical processes.
TOQUARTZ® solution
Standard borosilicate glass becomes cloudy after weeks in acid-rich environments.
TOQUARTZ® quartz sight glass maintains >90% transmittance after 72-hour exposure to 98% H₂SO₄, ensuring uninterrupted visual monitoring and reducing replacement frequency by 70%.
Quartz Sight Glass for Vacuum Chamber Applications
Key Advantages
- Dimensional tolerance controlled within ±0.05mm for diameters ≤100mm, ensuring leak-free sealing in high-vacuum systems (<10⁻⁶ Torr).
- Helium leak rate <1×10⁻⁹ mbar·L/s when integrated with CF flanges, verified by third-party vacuum integrity testing.
- Optical homogeneity Δn < 2×10⁻⁶ across 100mm aperture, enabling distortion-free laser beam transmission in optical vacuum setups.
- Custom AR coating options available (R<0.5% @ 1064nm), enhancing transmission in laser-based vacuum systems.
TOQUARTZ® solution
A Japanese research institute reported inconsistent fluorescence imaging results due to variable optical properties in standard petri dishes.
TOQUARTZ® quartz petri dishes provided consistent optical performance, eliminating background variability and enabling reliable quantitative fluorescence measurements.
Customization Services for TOQUARTZ® Quartz Sight Glass
Material Grade Options
JGS1 High-OH Content Quartz
Produced using high-purity hydrogen-oxygen flame fusion with ~2000ppm hydroxyl content. Offers superior UV transmission with up to 90% transmittance at 185μm. Ideal for UV applications requiring exceptional short-wavelength transmission in the 185-2500mμ range.
JGS2 Medium-OH Content Quartz
Contains minimal metal impurities (tens of ppm) with hydroxyl content between 100-200ppm. Features some striae and particulate structure. Suitable for applications requiring transmission in the 220-2500μm wavelength range.
JGS3 Low-OH Content Quartz
Manufactured using vacuum electric melting with minimal hydroxyl content. Contains minor bubbles, particulate structure and striae. Offers superior infrared transmission (>85%) making it ideal for applications in the 260-3500μm wavelength range.
Surface Treatments & Modifications
Polished finishes for enhanced optical clarity
Ground edge treatments for mounting systems
Beveled edges for stress distribution
Drill holes for bolt-through mounting
Coating options for specialized applications
TOQUARTZ® Customization Engineering Process
Requirements Analysis
TOQUARTZ® engineers review your application specifications and operating conditions.
Design Consultation
Collaborative design process with material and dimensional recommendations.
Prototype Production
Rapid sample production for testing and validation.
Production & QC
Manufacturing with comprehensive quality control and documentation.
Installation and Maintenance Guide for Quartz Sight Glass
Installation Recommendations
- Ensure mounting surfaces are clean, flat and free of debris.
- Use appropriate gasket materials compatible with your application temperature.
- Apply uniform pressure when tightening retaining fixtures to prevent stress concentration.
- For flanged applications, use torque patterns and specifications appropriate for your flange design.
- Avoid direct contact between quartz and metal surfaces when possible.
Cleaning & Preparation
- Inspect sight glass regularly for signs of etching, clouding or cracking.
- Clean using non-abrasive, solvent-free cleaners compatible with quartz.
- Avoid thermal shock by preventing rapid temperature changes when possible.
- Replace gaskets during sight glass replacement to ensure proper sealing.
- Store spare sight glasses in clean, dry conditions, protected from physical impact.
Thinking of upgrading your furnace, reactor, or vacuum system?
Why Partner with TOQUARTZ
Direct Factory Advantage
As a direct manufacturer, we can cut out the numerous intermediate links.
Engineering Expertise
Technical team guides clients from material selection to design optimization, translating specs into deliverables.
Flexible Manufacturing
Handling standard & custom orders via small-batch expertise and prototyping rigor to meet urgent deadlines.
Quality
Assurance
Pre-shipment 3-step validation:
1. dimensional accuracy,
2. material purity ,
3. performance thresholds
Global Supply Chain
Reliable global logistics to industrial hubs (DE/US/JP/KR priority) with trackable milestones.
Releted Products
As a specialized manufacturer with direct factory capabilities, TOQUARTZ provides both standard and custom quartz solutions with engineering support throughout the specification and implementation process.
FAQ
Q: What is the difference between the JGS-1, JGS-2, and JGS-3 quartz glass grades?
A: JGS-1 is far UV grade quartz with high OH content (2000 PPM), offering excellent transmission down to 185nm. JGS-2 is UV grade with moderate OH content (100-200 PPM), suitable for 220-2500μm applications. JGS-3 is IR grade with minimal OH content, optimized for 260-3500μm wavelength transmission. The choice depends on your specific wavelength requirements.
Q: How do I clean quartz glass plates without damaging them?
A: For optical applications, use isopropyl alcohol or acetone with lint-free wipes. For general cleaning, a mild detergent solution followed by thorough rinsing with deionized water is recommended. Avoid abrasive cleaners and tools that could scratch the surface. For stubborn contaminants, ultrasonic cleaning in appropriate solutions is effective.
Q: Are your quartz glass plates suitable for semiconductor applications?
A: While our quartz glass plates meet many requirements for semiconductor-adjacent applications, we do not currently serve the high-end semiconductor industry that requires ultra-high purity (99.9999%) and specialized certifications. Our products are suitable for research, optical, laboratory, and industrial applications with purity levels up to 99.995%.
Q: Can you drill holes or create custom shapes in quartz glass plates?
A: Yes, we offer precision drilling, cutting, and machining services for quartz glass plates. We can create custom shapes, holes, slots, and other features according to your technical drawings. Our capabilities include water jet cutting, ultrasonic drilling, and precision grinding to achieve complex geometries while maintaining material integrity.
Q: How do quartz glass plates compare to borosilicate glass?
A: Quartz glass offers significantly higher temperature resistance (1100°C vs 500°C for borosilicate), superior UV transmission, better chemical resistance, and lower thermal expansion. Borosilicate is more cost-effective for applications that don’t require these advanced properties. For high-temperature, optical, or chemically demanding applications, quartz glass is the superior choice.
Contact our engineering team for technical consultation and pricing. We’ll help you select the optimal specifications for your application requirements.