Patent ID: 9593038
Date: 2017-03-14
CPC Classifications: C03B,C03C,C08J

Claim:
1. A fiberizable glass composition formed from a glass batch composition comprising at least 50 weight percent of a glassy mineral, wherein the glassy mineral comprises a combination of SiO 2 and Al 2 O 3 in an amount of at least 80 weight percent, and at least 5 weight percent of a sodium source, wherein the glass composition comprises 53-61 weight percent SiO 2 , from 8 to less than 12 weight percent Al 2 O 3 , less than 1 weight percent of Fe 2 O 3 , 0 weight percent B 2 O 3 , from greater than 14 to 18 weight percent alkali metal oxide component (R 2 O), 0-3 weight percent La 2 O 3 , and at least one metal oxide (RO) component selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO, wherein CaO is present in an amount ranging from 7 to 26 weight percent of the glass composition, and optional ZnO in an amount ranging from 0 to 3 weight percent of the glass composition, and wherein R 2 O comprises K 2 O in an amount ranging from 2 to 4 weight percent.