Glass yarn for reinforcing organic and/or inorganic materials

2232222232The invention relates to glass reinforcement strands, the composition of which comprises the following constituents in the limits defined below, expressed as percentages by weight: 58 to 63% SiO; 10 to 16% AlO; 16 to 23% CaO; 0.5 to 3.5% MgO; 0 to 2% NaO+KO+LiO; 1 to 1.5% TiO; 0 to 1.5% BO; 0 to 0.4% LiO; 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.