| 摘要 |
The glass reinforcing fibre consists essentially of the following constituents within the defined limits, expressed in weight per cent: SiO2 50 - 65 per cent, Al2O3 12 - 20 per cent, CaO 2 - 17 per cent, MgO 6 - 12 per cent, B2O3 0 - 3 per cent, TiO2 0 - 3 per cent, Na2O + K2O less than 2 per cent, F2 0 - 1 per cent, Fe2O3 less than 1 per cent. The combined content of MgO + Al2O3 is over 24 per cent, and the combined content of SiO2 + Al2O3 is at least 70 per cent. |
