Patent ID: 6690869
Filing Date: 2004-02-10
Classification: C03C

Abstract:
A multicomponent glass for light-transmitting bodies for use as a core glass in glass fibers, characterized in that the glass is a glass of the lanthanide flint type having the following composition in mol %:SiO2â€‚0-40B2O320-70ZnOâ€‚1-15PbOâ€‚0-35Lanthanide oxideâ€‚1-23ZrO2 and/or HfO2â€‚1-10MgO and/or CaO0-7SrO and/or BaO0-9TiO20-4Sb2O3 and/or As2O30.1-0.3Nb2O50-5Ta2O50-3WO30-2Al2O30-8Fâ€‚0-15.without CdO,with a refractive index n=at least 1.74, an American softening point of between 525Â° C. and 725Â° C., and a coefficient of expansion of between 30Â° C. and 300Â° C. of between 60 and 80Ã—10âˆ’7.