Patent ID: 8450226

Claim:
Glass fibers of high heat resistance, comprising: SiO 2 in an amount ranging from about 46.0 to about 76.0 weight percent, Al 2 O 3 in an amount ranging from about 0.0 to about 26.0 weight percent, BeO in an amount ranging from about 1.0 to 17.5 weight percent, B 2 O 3 in an amount ranging from about 0 to about 9 weight percent, Na 2 O in an amount ranging from about 0.0 to about 12.0 weight percent, K 2 O in an amount ranging from about 0.0 to about 6.0 weight percent, CaO in an amount ranging from about 3.76 to about 18.5 weight percent, MgO in an amount ranging from about 1.84 to about 15.0 weight percent, Fe 2 O 3 +FeO in an amount ranging from about 4.64 to about 18.0 weight percent, ZrO2is an amount ranging from about 0.0 to about 5.0 weight percent, TiO 2 in an amount ranging from about 0.0 to about 3.0 weight percent, P 2 O 5 in an amount ranging from about 0.0 to about 4.0 weight percent, MnO in an amount ranging from about 0.0 to about 1.0 weight percent, and Li 2 O in an amount ranging from about 0 to about 9 weight percent.