Borosilicate Glass
Borosilicate glass is a technical glass known for low thermal expansion, high thermal shock resistance, good chemical durability, and clear optical appearance. Compared with standard soda-lime glass, it performs better under rapid temperature change and is widely used for sight glass, level gauge glass, oven windows, laboratory glass, industrial windows, optical substrates, and fire-rated building glass.
We supply borosilicate glass in cut-to-size sheets, discs, plates, machined parts, drilled panels, polished components, and custom shapes according to customer drawings.
Borosilicate 3.3
Borosilicate 3.3 is suitable for industrial equipment where glass must withstand heat, pressure change, chemical exposure, or repeated thermal cycling.
Common products include:
- Sight glass plates
- Level gauge glass
- Boiler and pressure vessel windows
- Oven door glass
- Furnace observation windows
- High-temperature enclosure panels
- Laboratory glass plates
- Optical windows and substrates
- 3D printer build plates
- Custom machined borosilicate parts
Flat, round, rectangular, grooved, drilled, and edge-polished parts can be produced according to drawings or samples.
Borosilicate 4.0
Borosilicate 4.0 is used in architectural fire-rated glazing where transparency, heat resistance, and fire integrity are required. It can be supplied for fire-rated doors, windows, partitions, corridor glazing, staircase glazing, curtain wall areas, and smoke barrier systems.
Compared with ordinary soda-lime glass, borosilicate fire-rated glass has lower thermal expansion, better resistance to rapid temperature change, high transparency, and a lower risk of spontaneous breakage. Final fire rating should be confirmed according to the required standard, glass thickness, frame system, and project certification.
Fabrication and Processing
We provide custom processing for borosilicate glass before tempering or final heat treatment.
Available processing includes:
- Straight cutting
- Circular cutting
- Irregular shape cutting
- CNC drilling
- Hole machining
- Slot cutting
- Edge grinding
- Polished edges
- Beveled edges
- Flat-ground edges
- Reflex groove machining for gauge glass
- Tempering
- Custom packing and inspection
Need Help?
Send dimensioned drawings (DWG/DXF/PDF) with thickness, quantity, and edge requirement, and our team will quote your glass cutting project.
Typical Applications
Sight Glass
Gauge Glass
Glass Tubes
Reactor Windows
Laboratory Components
Heat-Resistant Panels
Material Selection System
Use the operating requirement first, then confirm the glass family, processing route and inspection method.
Use the heating and cooling rate, not only peak temperature, to assess the thermal requirement.
Identify the medium, concentration, temperature and contact time.
Review unsupported diameter, thickness, seal and edge condition together.
Property Data System
Expansion
Low expansion improves thermal-shock performance.
Chemistry
Good durability suits many laboratory and process uses.
Forms
Sheet, tube, rod and custom processed components are available.
Fabrication
Cutting, holes, edges and heat treatment depend on grade and geometry.
Related Technical Pages
Products
See where this material fits in the product collections.
Capabilities
Review cutting, edging, drilling, strengthening, printing and coating.
Quality Control
Define inspection and traceability for the finished part.
Selection FAQ
What information should I send for a quotation?
Send the drawing, glass type if known, dimensions, thickness, tolerance, quantity, application and any edge, hole, printing, coating or strengthening requirement.
Can Specialglass help select the material?
Yes. Provide the operating temperature, optical requirement, chemical exposure, mechanical load and installation method. The engineering team can narrow the suitable glass families before quoting.
Are custom shapes available?
Custom discs, plates, windows, holes, slots, steps and CNC profiles can be reviewed against the selected material and process route.
Saving your time and cost is our common pursuit.
Tell us the material, size, thickness, tolerance, quantity, application, and any holes, slots, edges, coating, printing, or polishing requirements. We can manufacture custom glass components from your drawing, CAD file, sketch, or sample.
- Address
- Yunpu Industrial Zone, Nangang, Huangpu District, Guangzhou
- Call Us
- +86 19860070065
- Email Address
- info@specialglass.net
- +86 19860070065
- +86 19860070065