Patent ID: 7427576

Claim:
A glass fiber with improved thermal resistance comprising the following components (in % by weight and relative to the total weight) SiO 2 56.0 to 62.0 Al 2 O 3 11.0 to 20.0 CaO 20.0 to 25.0 TiO 2 1.5 to 4.0 MgO 0.2 to 1.0 Na 2 O 0.05 to 2.0 K 2 O 0 to 2.0 Fe 2 O 3 0.1 to 0.3 SO 3 0.01 to 0.05 which fiber has a shrinkage of less than 20% at 800° C. and/or less than 55% at 825° C. and/or less than 80% at 850° C., and is produced according to a method in which the liquidus temperature of the glass melt and the fiberizing temperature differ by at least 95° C.