Borosilicate Glass Sight Glass is made from high borosilicate glass 3.3, featuring excellent thermal shock resistance, high temperature stability, and chemical durability. Designed for level gauges, industrial observation windows, and high-temperature equipment, it provides clear visibility and reliable performance. Customized sizes, thicknesses, shapes, and processing options are available to meet different industrial requirements.
Borosilicate Glass Sight Glass is manufactured from high borosilicate glass 3.3 material, providing excellent thermal shock resistance, high temperature stability, chemical durability, and optical transparency. Designed for level gauges, industrial observation windows, pressure equipment, and high-temperature systems, it enables clear visual monitoring under demanding operating conditions.
With a low thermal expansion coefficient of approximately 3.3 × 10⁻⁶/K, high borosilicate glass minimizes internal stress caused by rapid temperature fluctuations and provides superior fracture resistance compared with ordinary glass. Its stable physical properties and high light transmittance make it suitable for industrial sight windows, inspection ports, and precision observation applications. For applications requiring larger flat glass panels, our High Temperature Borosilicate Glass Sheet provides excellent thermal stability and customized processing options.
We provide customized Borosilicate Glass Sight Glass solutions with various sizes, thicknesses, shapes, and processing options. Based on customer drawings or application requirements, our engineering team can assist with product design and manufacturing solutions for different industrial equipment.
Excellent Thermal Shock Resistance
High borosilicate glass 3.3 features a very low thermal expansion coefficient, helping reduce stress caused by temperature differences and improving resistance to thermal shock during heating and cooling cycles.
High Temperature Performance
The material maintains stable physical properties under high-temperature environments and is suitable for continuous observation applications in furnaces, boilers, heating systems, and industrial equipment.
Superior Chemical Stability
Borosilicate Glass Sight Glass offers excellent resistance to acids, alkalis, and chemical corrosion, making it suitable for chemical processing equipment and harsh industrial environments.
High Optical Transparency
With light transmittance above 90%, the glass provides clear visibility for liquid level monitoring, equipment inspection, and process observation.
Precision Surface Quality
Manufactured through professional cutting, grinding, and polishing processes, the product features smooth surfaces, accurate dimensions, controlled tolerances, and reliable installation performance.
Custom Manufacturing Capability
We support customized Borosilicate Glass Sight Glass production according to drawings, samples, specifications, and application requirements, including different sizes, thicknesses, shapes, and edge processing.
| Item | Specification |
| Product Name | Borosilicate Glass Sight Glass |
| Material | High Borosilicate Glass 3.3 |
| Color | Transparent Clear |
| Light Transmittance | ≥90% |
| Thermal Expansion Coefficient | 3.3 ± 0.1 × 10⁻⁶/K |
| Softening Point | 820 ± 10℃ |
| Transformation Temperature | 525 ± 15℃ |
| Working Temperature | Up to 550℃ (depending on application conditions) |
| SiO₂ Content | 80 ± 0.5% |
| B₂O₃ Content | 13 ± 0.2% |
| Acid Resistance | ISO1776-1 |
| Alkali Resistance | ISO695-A2 |
| Hydrolytic Resistance | ISO719-HGB1 / ISO720-HGA1 |
| Processing Methods | Cutting, Grinding, Polishing, Edge Processing |
Borosilicate Glass Sight Glass is widely used in industrial equipment requiring transparent observation, high temperature resistance, and chemical durability.
Typical applications include:
· Level Gauge and Liquid Level Indicator Systems
· Chemical Processing Equipment
· Pressure Vessel Observation Windows
· Furnace and Heating Equipment Viewing Windows
· Boiler Inspection Windows
· Laboratory and Analytical Instruments
· Solar and Energy Equipment
· Industrial Lighting Equipment
· Process Control and Monitoring Systems
Customized Borosilicate Glass Sight Glass Manufacturing
As an experienced glass manufacturer, we provide customized Borosilicate Glass Sight Glass solutions for different industrial applications. From material selection to precision processing, we focus on delivering reliable glass products that meet specific equipment requirements.
Our manufacturing capabilities include:
· Custom size and thickness production
· Precision cutting according to drawings
· CNC shaping and machining
· Grinding and polishing
· Edge grinding and chamfering
· Surface quality inspection
· OEM manufacturing service
Customers can provide drawings, samples, dimensions, or application requirements. Our engineering team will evaluate the technical specifications and provide suitable manufacturing solutions.
High Borosilicate Glass 3.3 Material Structure
Borosilicate Glass Sight Glass is produced from high borosilicate glass 3.3, a specialized material containing high levels of silicon dioxide (SiO₂) and boron oxide (B₂O₃). This unique composition provides excellent thermal stability, chemical resistance, and optical performance.
Compared with ordinary glass, high borosilicate glass has a more stable molecular structure, lower thermal expansion, higher temperature resistance, and improved durability. These characteristics allow the glass to maintain reliable performance under rapid temperature changes and demanding industrial conditions.
Material Composition
| Material Component | Content | Function |
| Silicon Dioxide (SiO₂) | Approx. 80% | Provides hardness, structural stability, and chemical resistance |
| Boron Oxide (B₂O₃) | Approx. 13% | Reduces thermal expansion and improves thermal shock resistance |
| Aluminum Oxide (Al₂O₃) | Approx. 2.4% | Enhances mechanical strength and stability |
| Alkali Oxides (Na₂O+K₂O) | Approx. 4.3% | Improves glass forming properties |
Proper Handling for Long-Term Performance
Correct installation and handling are important to maintain the performance and service life of Borosilicate Glass Sight Glass.
Recommended considerations:
· Avoid mechanical impact during transportation and installation.
· Protect glass edges from damage before assembly.
· Ensure proper sealing between glass and equipment housing.
· Avoid uneven pressure distribution on the glass surface.
· Prevent sudden temperature changes during operation.
Following proper installation procedures helps maximize the reliability of the glass in industrial applications.
Secure Packaging for International Delivery
Borosilicate Glass Sight Glass products require careful protection during transportation due to their precise dimensions and glass material characteristics. We use professional packaging methods to minimize the risk of damage during international shipment.
Our packaging solutions include:
· Individual protective wrapping for each glass piece
· Shock-resistant foam and cushioning materials
· Customized cartons or wooden cases according to product size
· Moisture-proof packaging for long-distance transportation when required
· Clear product identification labels for order management
Located in Qingdao with convenient access to major ports, we provide efficient international shipping support for customers worldwide.
Professional Borosilicate Glass Sight Glass Manufacturer
With years of glass manufacturing experience, we provide reliable Borosilicate Glass Sight Glass solutions for industrial customers worldwide.
Our manufacturing expertise, quality control system, and customization capability allow us to support different industries with stable and professional glass products.
Our Advantages:
Experienced Manufacturing Capability
We have professional glass production experience and advanced processing equipment to support different industrial glass requirements.
Customized Solutions
We provide OEM and customized manufacturing services according to customer drawings, samples, specifications, and project requirements.
Strict Quality Control
From raw material selection to final inspection, every production stage is controlled to ensure consistent product quality.
Global Export Experience
Our glass products are supplied to customers in international markets, with experience supporting overseas orders and export requirements.
Convenient Logistics Support
Located in Qingdao, China, we have convenient access to ports and efficient transportation channels for global shipments.
Q1: What is Borosilicate Glass Sight Glass used for?
Borosilicate Glass Sight Glass is mainly used for level gauges, industrial observation windows, pressure vessels, boilers, furnaces, and equipment requiring transparent high-temperature viewing.
Q2: What temperature can High Borosilicate Glass 3.3 withstand?
High borosilicate glass 3.3 has excellent temperature stability and can typically support working temperatures up to approximately 550℃ depending on application conditions.
Q3: Can you customize Borosilicate Glass Sight Glass sizes?
Yes. We provide customized production according to customer drawings, dimensions, thickness requirements, and application conditions.
Q4: What processing methods are available?
We provide cutting, grinding, polishing, edge processing, and other customized machining services to meet different installation requirements.
Q5: Why choose borosilicate glass instead of ordinary glass?
Borosilicate glass provides lower thermal expansion, better heat resistance, stronger chemical stability, and higher durability compared with standard glass.
Get Customized Borosilicate Glass Sight Glass Solution
Looking for reliable high-temperature glass solutions for your industrial equipment?
Contact us for customized Borosilicate Glass Sight Glass products. Our engineering team can provide suitable recommendations based on your drawings, specifications, and application requirements.
Request a quotation today and get professional glass manufacturing support.