Patent ID: 6468932
Filing Date: 2002-10-22
Classification: C03C,Y10T

Abstract:
An Al2O3-containing, heat stable, silica based glass sliver, obtained by acid extraction of a glass sliver,wherein the glass sliver comprises glass staple fibers having different lengths, wherein each glass staple fiber has a length of 50 to 1000 mm; and wherein the glass sliver before the acid extraction comprises the following composition: 70-75% (wt.) SiO2 15-25% (wt.) Na2O and/or K2O 1 to 5% (wt.) Al2O3 and up to a maximum of 5% (wt.) of further components, wherein the glass sliver after the acid extraction is heat stable at temperatures above 400Â° C.; and wherein the glass sliver after the acid extraction comprises: 95 to 99% (wt.) SiO2 1 to 5% (wt.) Al2O3.