Abstract
The tensile and bending strength of glass fiber containing TiO2 and CaF2 as nucleating agents was investigated in connection with effects of devitrification, UV radiation and X-ray radiation. The glass fiber of the composition (SiO2 50; Al2O3 20; Li2O 5; TiO2 7; CaF2 13; MgO 5% by weight) was prepared by pot method in air at 1350°C. The bending tests on various fibers showed an average strength of 5000kg/cm2 which is almost identical to that before heattreatment. In case of non-heat-treatment, no difference was observed in the tensile and bending strength between the specimen not-irradiated and those irradiated with UV or X-ray. The properly heat-treated glass fiber was found to retain the tensile and bending strength almost identical to those of non-treated.
