Glass Yarn for Reinforcing Organic and/or Inorganic Materials

The invention relates to glass reinforcement strands, the composition of which comprises the following constituents in the limits defined below, expressed as percentages by weight: 59 to 63% SiO2; 10 to 16% Al2O3; 16 to 23% CaO; 1 to 3.2% MgO; 0 to 2% Na2O+K2O+Li2O; 0 to 1% TiO2; 0.1 to 1.8% B2O3; 0 to 0.5% Li2O; 0 to 0.4% ZnO; 0 to 1% MnO; and 0 to 0.5% F. These strands have improved properties in terms of mechanical strength, acid resistance and high-temperature resistance for a low-cost composition. The invention also relates to a process for producing the said strands and to the composition allowing them to be produced. 本发明涉及增强玻璃丝，其组合物含有下述组分，用重量百分数表示的这些组分范围如下：SiO？59-63％；AlO？10-16％；CaO？16-23％；MgO？1-3.2％；NaO+KO+LiO？0-2％；TiO？0-1％；BO？0.1-1.8％；LiO？0-0.5％；ZnO？0-0.4％；MnO？0-1％；F？0-0.5％。对于低成本组合物，这些丝的机械强度、耐酸性介质和耐高温性性能获得改进。本发明还涉及所述丝的制备方法和能生产它们的组合物。