The organicity and/or the complex, and the component below includes the glass thread and this thread which are suited for strengthening the inorganic material constituent null which

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.