Long-term weathering test of carbon fiber reinforced plastic (CFRP) plates is ongoing. CFRP is made of PAN type carbon fiber and epoxy resin, and two types of test piece, unidirectional fiber reinforced composite plate and woven fabric reinforced composite plate, are used. Outdoor exposure test began in 1986, after which several series of tests were added. In this report, part of the results of observation and testing of CFRP plates carried out up to 33 years outdoor exposure are arranged and shown.
