Borosilicate Glass 3.3 offers low thermal expansion, good thermal shock resistance and high optical clarity. Available as custom glass sheets, panels and discs for sight glass, gauge glass, boiler viewing windows and industrial applications.
Borosilicate glass 3.3 is a specialty glass known for its low thermal expansion, good thermal shock resistance, chemical durability and high optical clarity. Compared with ordinary glass, it provides better stability when exposed to temperature changes and is suitable for applications involving repeated heating, cooling and visual inspection.
Vatti Glass supplies customized borosilicate glass sheets, panels and borosilicate glass discs in different sizes and thicknesses. The glass can be processed according to customer drawings and specifications for sight glass, gauge glass, boiler viewing windows, laboratory equipment, optical instruments and other industrial applications.
With thicknesses from 2 mm to 30 mm and customized shapes available, borosilicate glass can be supplied for both standard and application-specific requirements.
| Property | Specification |
| Material | Borosilicate Glass 3.3 |
| Product Type | Borosilicate glass sheet, panel and glass disc |
| Shape | Round, square or customized |
| Size | Customized according to drawings |
| Thickness | 2–30 mm |
| Maximum Working Temperature | ≤550°C |
| Coefficient of Thermal Expansion | (3.3 ± 0.1) × 10⁻⁶/K |
| Softening Point | 820 ± 10°C |
| Thermal Shock Resistance | ≥125 K |
| Refractive Index | 1.47384 |
| Light Transmission | 92% for thickness ≤4 mm; 91% for thickness ≥5 mm |
| Surface | Clear / transparent |
| Edge Processing | Cutting, grinding and polishing available |
Actual dimensions, tolerances and processing requirements can be confirmed according to customer drawings and application conditions.
Low Thermal Expansion
Borosilicate glass has a low coefficient of thermal expansion, helping maintain dimensional stability when temperature changes occur. This makes it suitable for equipment exposed to repeated heating and cooling cycles.
High Thermal Shock Resistance
The material provides good resistance to rapid temperature changes compared with ordinary glass. This property is important for sight glass, viewing windows and equipment that experiences frequent thermal cycling.
Good Heat and Chemical Resistance
With a softening point of approximately 820 ± 10°C, borosilicate glass provides good resistance to elevated temperatures. It also offers good chemical durability, making it suitable for laboratory and industrial environments.
The actual working temperature should be evaluated according to the glass thickness, installation method, thermal conditions and application environment.
High Optical Clarity
Borosilicate glass provides good light transmission, reaching approximately 92% for glass with a thickness of 4 mm or less. Its clear appearance makes it suitable for applications where operators need to observe equipment or process conditions through the glass.
Vatti Glass supplies custom borosilicate glass discs for industrial, laboratory, optical and equipment applications.
Round glass discs can be manufactured according to the required diameter, thickness and edge-processing specifications. Customers can provide drawings, sample dimensions or technical requirements for customized production.
Available processing options include:
Cutting to specified dimensions
Edge grinding
Edge polishing
Customized thickness
Customized diameter
Round and other specified shapes
Borosilicate glass discs can be used as viewing windows, gauge glass components, protective windows, instrument components and other transparent parts requiring thermal stability and dimensional consistency.
In addition to round glass discs, Vatti Glass supplies borosilicate glass sheets and panels in customized sizes and shapes.
Rectangular, square and irregular panels can be produced according to equipment requirements. Different thicknesses can be selected based on the application, installation method and required mechanical performance.
Typical applications include:
Industrial viewing windows
Process observation panels
Laboratory equipment
Heating equipment
Instrument windows
Protective transparent panels
Borosilicate glass is widely used for sight glass and gauge glass applications because it combines transparency with good thermal stability.
A sight glass allows operators to observe the condition of equipment or a process without opening the system. Depending on the equipment design, it can be used to observe liquid levels, flow conditions or material movement.
Gauge glass can also be used as a transparent component in liquid-level indicators and monitoring equipment.
Vatti Glass can supply customized glass components according to required dimensions, thicknesses and processing specifications.
Borosilicate glass can be used for boiler sight glass, industrial viewing windows and other high-temperature equipment where visual observation is required.
For these applications, working temperature, pressure, glass thickness, sealing method, mounting structure and thermal cycling should be considered together when selecting the glass.
For pressure-related applications, the final glass specification should be confirmed according to the equipment design and applicable engineering requirements. Vatti Glass can manufacture the glass according to customer drawings and specified dimensions.
The combination of thermal stability, chemical durability and optical clarity makes borosilicate glass suitable for laboratory, optical and instrument applications.
It can be supplied as sheets, panels, discs or customized components for:
Laboratory viewing windows
Instrument windows
Transparent protective panels
Optical components
Equipment covers
Heating-related laboratory equipment
For applications involving direct chemical contact or repeated thermal cycling, the glass specification should be selected according to the actual operating conditions.
Vatti Glass provides customized borosilicate glass according to customer drawings, dimensions and technical requirements.
Customization options include:
Customized diameter
Customized length and width
Customized thickness
Round, square and irregular shapes
Edge grinding
Edge polishing
Cutting according to drawings
Customized glass components
For customized industrial glass, customers can provide the required dimensions, thickness, quantity, shape and application information when requesting a quotation.
For high-temperature or pressure-related applications, working temperature, pressure and mounting method can also be provided to help confirm the appropriate glass specification.
Qingdao Vatti Glass Co., Ltd. supplies borosilicate glass and other specialty glass products for industrial and commercial applications.
We provide customized glass sizes, thicknesses, shapes and processing options according to customer drawings and technical requirements. Our specialty glass products are supplied for different industrial applications where thermal stability, transparency and reliable glass performance are required.
For customized orders, customers can provide drawings or technical specifications before production so that dimensions, thickness, processing requirements and application conditions can be confirmed.
Whether you need a standard borosilicate glass sheet, custom borosilicate glass disc, gauge glass, sight glass or a customized industrial viewing window, Vatti Glass can provide glass products according to your required dimensions and specifications.
Please provide the following information when requesting a quotation:
Glass type or required material
Length and width or glass diameter
Thickness
Quantity
Shape
Edge-processing requirements
Working temperature
Working pressure, if applicable
Application or equipment type
Technical drawing, if available
Send us your requirements or drawings for customized borosilicate glass, and our team can review the specifications for your project.