Patent ID: 6998361

Claim:
A glass composition for forming glass fibers of high heat resistance, comprising: SiO 2 in an amount of about 46.23 weight percent, Al 2 O 3 in an amount of about 25.91 weight percent, Na 2 O in an amount of about 2.40 weight percent, K 2 O in an amount of about 0.82 weight percent, CaO in an amount of about 8.27 weight percent, MgO in an amount of about 4.06 weight percent, Fe 2 O 3 +FeO in an amount of about 10.22 weight percent, TiO 2 in an amount of about 1.58 weight percent, ZrQ 2 in an amount of about 0.01 weight percent, P 2 O 5 in an amount of about 0.28 weight percent, and MnO in an amount of about 0.23 weight percent.