Customization: | Available |
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After-sales Service: | 1 Years |
Type: | Refractory Glass |
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Factory production of high borosilicate glass high borosilicate heat-resistant glass
borosilicate glass high temperature resistance high level
China is the third country that can produce float high borosilicate glass 3.3. plat borosilicate glass 3.3 (English name: plat borosilicate glass 3.3, alternative to SCHOTT trademark borofloat ® 3.3,CORNING trademark pyrex ®7740) is manufactured by float process. A flat glass with sodium oxide (Na2O), boron oxide (B2O3) and silicon dioxide (SiO2) as the basic ingredients. The content of boron and silicon in this kind of glass is high, boron: 12.5 ~ 13.5%, silicon: 78 ~ 80%. So this kind of glass is called high borosilicate glass. It belongs to Pylex glass in borosilicate glass. It is characterized by small coefficient of thermal expansion, good thermal stability, chemical stability, light transmittance and electrical properties, so it has chemical erosion resistance, thermal impact resistance, good mechanical properties, high temperature, high hardness characteristics, so it is also known as heat-resistant glass, heat-resistant impact glass, high temperature resistant glass, but also a kind of special fireproof glass.
Mechanical properties | |
Density (g/cm3) (at 25°C) | 2.23±0.02 |
Knoop hardness | 480 |
Flexure strength | 24Mpa |
Thermodynamic properties | |
Coefficient of thermal expansion (α) (0-300°C) | 3.3±0.1×10-6 |
Softening point (°C) | 830±10 |
Strain point (°C) | 521±10 |
Specific heat capacity | (2-100°C)0.83KJ×(kg×K)-1 |
Thermal conductivity | 1.2W×(m×k)-1 |
Thermal shock resistance(K) | 300 |
Temperature performance(K) | 200 |
Maximum working temperature | (>10h, 600°C), (>10h, 550°C) |
Chemical properties | |
Water resistence | ISO719/DIN12111, HGB1 ISO720, HGA1 |
Acid resistance | ISO1776/DIN12116, 1 |
Alkali resistance | ISO695/DIN52322, A2 |
Optical properties | |
Refractive index | Nd: 1.47379 |
Transmittance (5mm) | >92% |
Electrical properties | |
Specific resistance 1g | 250°C, 8.0Ω×cm |
Dielectric loss | Tan , 38×(10)-4 |
Dielectric Constant | 4.7 |
Chemical component | |
SiO2 | 79-82% |
B2O3 | 8-14% |
Na2O | 2-4% |
Al2O3 | 1-6% |