SiC fiber and glass fiber reinforced epoxy resins (SiCFRP and GFRP), which were fabricated by using matching male and female metal molds, were immersed in boiling water for the periods from 5 to 500 ...hours. The amount of water absorption of SiCFRP was less than that of GFRP, and those of SiCFRP and GFRP immersed for 100 hours were 38.5mg/cm3 and 76.6mg/cm3, respectively. The amount of water absorption at the time when the width of SiCFRP specimen began to increase was 9.5mg/cm3 against 44mg/cm3 of that of GFRP. ILSS retention of SiCFRP immersed decreased with increasing immersion time, while the diameter, weight and tensile strength of SiC fiber were not affected at all by immersion in boiling water up to 500 hours. The ILSS retension of 74% for SiCFRP immersed for 100 hours was almost the same as that of 76% for GFRP. The reason of such low durability of SiCFRP to hot water was interpretated as the bond between the fiber and resin was weak to water because the surface of SiC fiber was not treated.
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