FIELD: glass materials. SUBSTANCE: glass for fiber glass has, wt.-%: silicon oxide 52-60; aluminium oxide 12-20; boron oxide 0.1-8; calcium oxide 20-26; magnesium oxide 0.5-2.4; ferric oxide 0.1-0.4; sodium oxide 0.1-0.4, and fluorine 0.1-0.3. Properties: tensile strength is 10.17-12.15 kg/mm2, rupture strength is 2360-2475 gs/tex. Material is used for preparing of glass fibers, glass fabric, nonwoven materials, etc. EFFECT: enhanced quality of glass. 2 tbl
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