Glass composition for insulation fibers and fiber-making process for obtaining such fibers.

Abstract

Glass composition for insulation fiber comprising, in mass percentages: SiO2: between 62.0% and 65.0%, Na2O: between 14.0% and 16.0%, CaO: between 6.0% and 9.0%, MgO: between 1.5% and 4.0%, B2O3: between 5.5% and 7.5%, Al2O3: between 1.5% and 2.5%, K2O: between 0% and 2.0%, other oxide(s): between 0% and 5.0% cumulative by weight, preferably between 0% and 2.0% cumulative, wherein the Na2O / B2O3 ratio is between 1.90 and 2.80. Insulation fibers obtained from said composition and process for manufacturing such fibers.