Patent ID: 6809050
Filing Date: 2004-10-26
Classification: C03C,F01N

Abstract:
A continuous glass fiber produced from a composition consisting essentially of:60-72 mole percent SiO2, 10-20 mole percent Al2O3, 14.0 to 22.0 mole percent RO, where RO equals the sum of MgO, CaO, SrO and BaO mole percents, wherein the amount of MgO is less than 3 mole percent, 0 to 5 mole percent ZrO2, and 0 to 3 mole percent alkaline metal oxide, wherein the composition has (i) a glass transition tcmperature of at least 1472Â° F. (800Â° C.), (ii) a viscosity of about 1000 poise at a forming temperature greater than 2500Â° F. (1371Â° C.), (iii) a liquidus temperature at least 50Â° F. (28Â° C.) below the forming temperature, and (iv) a glass transition temperature greater than 1517Â° F. (825Â° C.).