Chemical composition |
| Main components in approx. |
weight % |
| Si O2 |
75 |
| B2O3 |
10.51 |
| AL2O3 |
5.27 |
| Fe2O3 |
0.024 |
| CaO |
1.59 |
| K2O |
1.64 |
| Na2O |
4.76 |
| Li2O |
0.27 |
| BaO |
0.55 |
Physical properties |
| Coefficient of mean linear thermal |
| expansion(20℃,300℃) |
5.0*10-6K-1 |
| Softening point |
786℃ |
| Annealing point |
562℃ |
| Density |
2.37g/cm3 |
Chemical properties |
Hydrolytic Class |
|
| To EP |
TYPE 1 |
| TO USP |
TYPE 1 |
| Acid resistance Class (DIN 12116) |
TYPE 1 |
| Alkali resistance Class (DIN ISO 695) |
TYPE 1 |
| Powered Glass |
USP<661> NMT1.0mL 0.2mLconforms |
| Water attack for glass |
USP<661> N/A ＜0.1mL |
| Arsenic |
USP<661> NMT 0.1ug/g ＜0.1ug/g, conforms |
