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A method was devised to determine the fiber content in Fiber Reinforced Plastics (FRP) by the microwave technique and the result was as follows:The fiber content in Carbon FRP (CFRP) and Glass FRP (GFRP) could be determined from the trans mission loss of microwave with a high accuracy. The relation between the fiber content and the transmission loss of microwave in the case of GFRP differed from that of CFRP. The fiber content of CFRP having more than 10 plies of carbon cloth could not be measured by this technique due to the larger transmission loss of CFRP.The fiber content could be measured by this method when the resin in FRP was not only solid, but also in liquid.

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