Abstract
Sizing has been ever considered to spread wholly in resin, but its distribution has not been clear. Dyeing of FRP that was different in amount of sizing with acid dyestuff was applied to attempt visualizing the distribution of sizing in FRP, and revealed it. In result, it was found that sizing didn't wholly spread in resin. When amount of sizing is much, most sizing was around of fiber strands. Difference in amount of sizing made difference in distribution of sizing, which effected on tensile strength. SMC that contained the smallest amount of sizing had the smallest tensile strength. Therefore, it was found that sizing around strands made large tensile strength of FRp.
