| 摘要 |
<p>The invention concerns a glass yarn whereof the composition comprises the following constituents in the limits defined, expressed in weight percentages: SiO2 50 to 60 %, preferably SiO2 ≥ 52 % and/or SiO2 ≤ 57 %; Al2O3 10 to 19 %, preferably Al2O3 ≥ 13 % and/or Al2O3 ≤ 17 %; B2O3 16 to 25 %; P2O50.5 to 4 %; Na2O ≤ 1.5 %, preferably Na2O ≤ 0.8 %; K2O ≤ 1.5 %, preferably K2O ≤ 0.8 %; R2O ≤ 2 %, preferably R2O ≤ 1 %; CaO ≤ 10 %; MgO ≤ 10 %; F ≤ 0 to 2 %; RO 4 to 15 %, preferably RO ≥ 6 % and/or RO ≤ 10 % ; miscellaneous ≤ 3 % ; wherein R2O = Na2O + K2O + Li2O and RO = CaO + MgO. The dielectric properties of said glass compositions are particularly advantageous.</p> |
