Glass composition having improved hydraulic resistance for the manufacture of glass reinforcing strands
AssigneeOCV Intellectual Capital, LLC
InventorsAnne Berthereau, Jerome Lalande
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Abstract
The present invention relates to a chemically resistant glass composition for the production of reinforcing strands which comprises the following constituents within the limits defined below, expressed in mol %: SiO2 67-72%; ZrO2 5-9.5%, preferably ≥7.5%; R2O (R═Na, K and Li) 11-17%; Li2O 0-5.5%; K2O 0-5.5%; Na2O<10%; and CaO 3-9%, the composition furthermore containing less 1% of impurities (Al2O3, Fe2O3, Cr2O3, TiO2, MgO, SrO, BaO and P2O5) and being free of F. It also relates to the glass strands obtained from this composition and to the composites based on an organic or inorganic material containing such strands.
Claims14
A glass fiber reinforced composite material, comprising:
- a matrix material;
- and
- reinforcing glass fibers, wherein said reinforcing glass fibers are formed from a glass composition comprising:
- 67-72 mol % SiO2;
- 5-9.5 mol % ZrO2;
- 11-15.7 mol % R2O where R2O is the sum of Na2O, K2O and Li2O;
- 0-5.5 mol % Li2O;
- 2.5-5.5 mol % K2O;
- less than 10 mol % Na2O;
- 3-9 mol % CaO;
- less than 0.5% of impurities selected from the group consisting of Al2O3, Fe2O3, Cr2O3, TiO2, MgO, SrO, BaO and P2O5;
- and
- wherein said reinforcing fibers are free of F.
Dependencies are inferred from the claim text.