초록 ▼

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

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.

대표청구항 ▼

What is claimed is: 1. A glass strand, comprising the following constituents in the limits defined below, expressed as percentages by weight: SiO2 59 to 63 Al2O3 10 to 16 CaO 16 to 23 MgO 1 to less than 3.2 Na2O + K2O 0 to 2 TiO2 0 to 1 B2O3 0.5 to 1.5 Li2O 0 t

What is claimed is: 1. A glass strand, comprising the following constituents in the limits defined below, expressed as percentages by weight: SiO2 59 to 63 Al2O3 10 to 16 CaO 16 to 23 MgO 1 to less than 3.2 Na2O + K2O 0 to 2 TiO2 0 to 1 B2O3 0.5 to 1.5 Li2O 0 to 0.5 ZnO 0 to 0.5 MnO 0 to 1 and which does not comprise F or Li. 2. The glass strand according to claim 1, formed from a glass melt obtained by melting a batch characterized in that the said batch includes borax. 3. The glass strand according to claim 1, characterized in that the TiO2 content is greater than or equal to 0.5%. 4. The glass strand according to claim 1, wherein when the TiO2 content is less than or equal to 0.5%, the SiO2 content is greater than 60.5%. 5. The glass strand according to claim 1, wherein the MgO content is greater than or equal to 2.2%. 6. A composite, comprising glass strands, organic material, inorganic material and the glass strand as defined in claim 1. 7. A fitting for an exhaust system, the glass strand as defined in claim 1. 8. A glass composition suitable for producing glass reinforcement fibres, which comprises the following constituents in the limits defined below, expressed as percentages by weight: SiO2 59 to 63 Al2O3 10 to 16 CaO 16 to 23 MgO 1 to less than 3.2 Na2O + K2O 0 to 2 TiO2 0 to 1 B2O3 0.5 to 1.5 ZnO 0 to 0.5 MnO 0 to 1 and which does not comprise F or Li. 9. A process for manufacturing glass strands, comprising attenuation into the form of one or more webs of continuous filaments from a multiplicity of molten glass streams emanating from a multiplicity of orifices placed at the base of one or more bushings, and of assembling the said filaments into one or more strands that are collected on a moving support, the molten glass feeding the bushings having a composition according to claim 8.