LOW ALUMINA CONTENT GLASS YARNS FOR REINFORCING ORGANIC MATERIALS

摘要

The invention relates to reinforcing glass strands, the composition of which comprises the following constituents within the limits defined below expressed as percentages by weight: SiO2 62-72% Al2O3  2-10% CaO  7-20% MgO 1-7% Na2O + K2O + Li2O   10-14.5% Li2O 0-2% BaO + SrO + ZnO 0-4% B2O3 0-4% F2 0-2% As2O3   0-0.15% These strands are composed of a low-cost glass offering an excellent compromise between the mechanical properties represented by the tensile strength and the fiberizing conditions. The invention also relates to the composites based on organic and/or inorganic material(s) and the aforementioned glass strands.