High borosilicate glass 3.3 sheet with low thermal expansion, high temperature resistance, excellent chemical durability, and high transparency. Available in customized sizes, thicknesses, shapes, and processing options for industrial, oven, laboratory, optical, and other demanding applications.
High borosilicate glass 3.3 is a heat resistant glass material with low thermal expansion, high temperature resistance, excellent chemical durability, high transparency, and good mechanical strength. Also known as borosilicate glass 3.3, it is suitable for applications exposed to heat, temperature changes, chemicals, and demanding operating conditions.
High borosilicate glass sheets can be supplied in different sizes, thicknesses, shapes, and processing configurations according to application requirements.
Low Thermal Expansion
High borosilicate glass 3.3 has a very low coefficient of thermal expansion, helping reduce dimensional changes and thermal stress caused by temperature variations. This property contributes to good thermal shock resistance and dimensional stability.
High Temperature Resistance
With a softening point of 820 ± 10°C, high borosilicate glass provides good thermal stability for applications involving elevated temperatures. It can be used for oven glass, viewing windows, sight glass, and other heat-resistant glass applications.
Excellent Chemical Resistance
Borosilicate glass 3.3 provides good resistance to water, acids, and alkalis. Its chemical durability makes it suitable for laboratory, pharmaceutical, chemical, and industrial applications.
High Transparency
The high transparency and good light transmission of borosilicate glass make it suitable for viewing windows, equipment covers, optical components, and other applications where clear visibility is required.
Good Mechanical Strength
High borosilicate glass combines thermal stability with good mechanical performance, making it suitable for industrial glass components requiring both durability and resistance to temperature changes.
Borosilicate glass 3.3 is a high-performance glass material characterized by its low coefficient of thermal expansion and good thermal and chemical stability.
The “3.3” designation is associated with its low mean linear coefficient of thermal expansion. For this glass, the coefficient is 3.3 ± 0.1 × 10⁻⁶ K⁻¹ at 20–300°C.
High borosilicate glass may also be referred to as high boron glass, reflecting the role of boron-containing components in its glass composition and resulting thermal and chemical properties.
Compared with ordinary glass, borosilicate 3.3 glass is better suited to applications involving temperature changes, elevated temperatures, and chemical exposure.
| Property | Specification |
| Glass Type | High Borosilicate Glass 3.3 |
| Mean Linear Coefficient of Thermal Expansion (20–300°C) | 3.3 ± 0.1 × 10⁻⁶ K⁻¹ |
| Softening Point | 820 ± 10°C |
| Melting Point | 1260 ± 20°C |
| Transformation Temperature | 525 ± 15°C |
| Hydrolytic Resistance at 98°C | ISO 719 – HGB1 |
| Hydrolytic Resistance at 121°C | ISO 720 – HGA1 |
| Acid Resistance Class | ISO 1776 – 1 |
| Alkali Resistance Class | ISO 695 – A2 |
High borosilicate glass 3.3 is used where thermal stability, transparency, and chemical durability are required.
Heat Resistant Glass for Ovens
Borosilicate glass can be used for oven windows and other heating equipment where heat resistance, transparency, and resistance to temperature changes are important.
Sight Glass and Viewing Windows
High borosilicate glass can be processed into sight glass and viewing windows for industrial, laboratory, and heating equipment, providing clear observation while maintaining good thermal and chemical resistance.
Laboratory and Chemical Equipment
Its combination of thermal stability and chemical resistance makes borosilicate glass suitable for selected laboratory equipment, chemical processing components, and pharmaceutical applications.
Solar, Lighting, and Optical Applications
High transparency and low thermal expansion allow borosilicate glass to be used in selected solar, lighting, optical, telescope, reflector, and mirror applications where dimensional stability is important.
High borosilicate glass sheets can be customized according to application requirements and customer drawings.
Available customization may include:
Custom thickness
Custom length and width
Round, square, rectangular, or irregular shapes
Precision cutting
Edge processing
Drilling
Customized surface requirements
OEM production according to drawings or specifications
When requesting a quotation, customers can provide dimensions, thickness, quantity, drawings, operating temperature, and application information. This helps determine the appropriate glass configuration for the project.
What sizes and thicknesses are available for high borosilicate glass?
High borosilicate glass can be supplied in customized sizes and thicknesses according to the application and customer requirements. Please provide your required dimensions and thickness when requesting a quotation.
Can high borosilicate glass be customized?
Yes. We can provide customized cutting, shapes, drilling, edge processing, and other requirements according to customer drawings or specifications.
What information is needed for a quotation?
Please provide the required glass type, dimensions, thickness, quantity, drawings if available, and application or operating conditions. This information helps us evaluate the requirements and provide an appropriate quotation.
What is the typical lead time for customized borosilicate glass?
Lead time depends on the glass specifications, processing requirements, and order quantity. We will confirm the production schedule after reviewing your requirements.
Looking for high borosilicate glass 3.3, heat resistant glass sheets, oven glass, sight glass, or customized borosilicate glass?
Send us your required dimensions, thickness, quantity, drawings, or application requirements. We can evaluate your specifications and provide a suitable glass solution for your project.