Performance and application of high borosilicate glass


High borosilicate 3.3 glass is high temperature resista […]

High borosilicate 3.3 glass is high temperature resistant glass, heat resistant glass and temperature difference resistant glass. The coefficient of linear expansion is 3.3 ± 0.1 × 10-6 / K. It is a glass based on sodium oxide (Na2O), boron oxide (B2O2), and silicon dioxide (SIO2). The glass composition has a high content of borosilicate, which is boron: 12.5 ~ 13.5% and silicon: 78 ~ 80%, so this kind of glass is called high borosilicate glass.

Mechanical properties Compared with ordinary glass, high borosilicate 3.3 glass has the advantage of light weight, especially suitable for applications with weight restrictions (for example, bulletproof glass) density (25 ℃) 2.2 g / cm3 Young's modulus (25 ℃)

Poisson's ratio 480 (ISO 9385) flexural strength thermal characteristics Low thermal expansion coefficient, strong thermal shock resistance, can withstand 450 ° C high temperature for a long time. 33 is particularly suitable for applications requiring good temperature stability (for example, the inner panel of a pyrolytic self-cleaning oven and the outer cover of a high-power floodlight).

Coefficient of linear thermal expansion 0.83 KJ x (kg x K) -1 Maximum operating temperature of thermal conductivity Short-term use 500 ° C Long-term use 450 ° Same temperature difference (performance of a piece of glass to withstand the temperature difference between the heating center and the colder edge)

Thermal shock resistance (the ability of the glass to withstand temperature quenching) 5mm160k The viscosity softening point of borosilicate glass is 820 ° Chemical characteristics High borosilicate 3.3 glass contains very few ferrous ions, so it is a clear and transparent colorless glass.

High borosilicate 3.3 glass is a clear and colorless glass. Excellent transmittance in the ultraviolet and visible near-infrared range makes high borosilicate 3.3 glass an ideal material for a variety of floodlights, high-power spotlights, and sunbeds (operating temperature up to 450 ° C). High borosilicate 3.3 glass has inherently low fluorescence and good surface quality. It can be widely used in the fields of optics, optoelectronics, photonics, and analysis equipment.

Electrical properties Due to the low alkali content, high borosilicate 3.3 glass can be used as a high insulator, so it is suitable for applications requiring high non-conductive properties at high temperatures (up to 450 ° C). Because of the unique structure of borosilicate glass, high borosilicate 3.3 glass has a neutron absorption effect. The basic use and installation guidelines for glass and glass ceramics also apply to high borosilicate 3.3 glass.

1. When determining the size of the frame and glass plate, the thermal expansion rates of high borosilicate 3.3 glass and various frame materials, as well as tolerances that may occur in production, should be considered.

2. During the installation design, the glass needs to be tightly installed in the frame. This pressure must be evenly loaded on all the perimeters of the board, and the pressure must be uniform.

High borosilicate glass can be further processed further: 1, cutting, 2, chamfering, 3, chamfering, 4, precision polishing of the surface, 5, drilling, 6, coating, 7, surface printing and frosting, 8, heat Bent high borosilicate 3.3 glass is widely used in chemical, aerospace, military, family, hospital and other fields. Can be made into lamps and microwave oven panels, stoves and fireplace panels, electric heaters, high-performance spotlights and floor lamps protection panels, red ultraviolet drying equipment, ultraviolet protection equipment, barbecue trays, test rooms and high-temperature welding masks, safety glass, etc .


1. Household appliances (glass panels inside ovens, microwave trays, stove panels, etc.);

2. Environmental engineering, chemical engineering (resistant lining, chemical reactor, safety sight glass);

3. Lighting (protective glass for spotlights and high-power floodlights);

4. Solar power (solar cell substrate);

5. Precision instruments (optical filters);

6. Semiconductor technology (wafer, display glass);

7. Medical technology bioengineering;

8. Safety protection (bulletproof glass).