| Technical specifications/Item |
Borosilicate Float Glass 3.3 |
Borosilicate Fireproof Glass 4.0 |
| Thickness range |
2mm-20mm |
5-12mm |
| Density(g/cm³) at 25℃ |
2.23±0.02 |
2.3±0.02 |
| Sizes |
1150*850mm 1700*1150mm 1830*2440mm 1950*2440mm
3660*2440mm ,customerized sizes are available |
4800*2440,customerized sizes are available |
| Color |
Ultra-clear transmittance 92% |
Ultra-clear transmittance 92% |
| Optical index of refraction |
1.48 |
1.47 |
| Coefficient of linear thermal expansion(20-300℃) |
3.3x10-6 K-1 |
4.0x10-6 K-1 |
| Specific heat capacity(20-100℃) |
0.83KJ/kg·K |
0.83KJ/kg·K |
| Thermal conductivity（90℃） |
1.2W/(M·K) |
1.2W/(M·K) |
| Heat short temperature |
240℃ |
300℃ |
| Softening point |
820℃ |
840℃ |
| Annealing point |
560℃ |
580℃ |
| Strain point |
510℃ |
530℃ |