Customization: | Available |
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Type: | Refractory Glass |
Structure: | Solid |
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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% |