초록 ▼

This invention relates to fine glass crystal prepared from lead-free glass compositions. The glasses consist essentially, in weight percent, of ________________________________ -SiO2 54-64 BaO 8-13 Li2O 0-3 SrO 8-13 Na2O 0-6.5 ZnO 5.5-9 K2O 0-7 BaO +SrO +ZnO 22-33 Li2O +Na2O +K2O 8-15 ______________

This invention relates to fine glass crystal prepared from lead-free glass compositions. The glasses consist essentially, in weight percent, of ________________________________ -SiO2 54-64 BaO 8-13 Li2O 0-3 SrO 8-13 Na2O 0-6.5 ZnO 5.5-9 K2O 0-7 BaO +SrO +ZnO 22-33 Li2O +Na2O +K2O 8-15 ________________________________ wherein at least two of Li2O, Na2O, and K2O are present and are present in essentially equimolar ratios.

대표청구항 ▼

A glass essentially free from lead which exhibits a density of at least 2.75 grams/cm3, a bell-like tone when struck, a coefficient of thermal expansion ranging from 85.9-91.4×10-7/°C., and excellent resistance to weathering consisting essentially, expressed in terms of weight percent on the oxide b

A glass essentially free from lead which exhibits a density of at least 2.75 grams/cm3, a bell-like tone when struck, a coefficient of thermal expansion ranging from 85.9-91.4×10-7/°C., and excellent resistance to weathering consisting essentially, expressed in terms of weight percent on the oxide basis, of ________________________________ -SiO2 54-64 BaO 8-13 Li2O 0-3 SrO 8-13 Na2O 0-6.5 ZnO 5.5-9 K2O 0-7 BaO +SrO +ZnO 22-33 Li2O +Na2O +K2O 8-15 ________________________________ wherein at least two of Li2O, Na2O and K2O are present and are present in essentially equimolar ratios.