| 摘要 |
The composition, based on a wt% of oxide basis is: SiO2 20-80, Na2O 0-40, K2O 0-40, Li2O 0-40, CaO 0-40, MgO 0-40, Al2O3 0-40, P2O5 0-1, B2O3 0-40, ZnO 0-10. Possible trace elements and/or the usual purification agents are present in normal quantities. The sum Na2O + K2O + LiO2 + CaO + MgO amounts to 15%-18%.
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