1.1 This classification covers machine-made “fiberglass” (glass-fiber-reinforced thermosetting-resin) pressure pipe. Methods of classification, requirements, test met This classification covers machine-made "fiberglass" (glass-fiber-reinforced thermosetting-resin) pressure pipes. Both glass-fiber-reinforced thermosetting-resin pipes (RTRP) and glass-fiber-reinforced polymer mortar pipes (RPMP) are fiberglass pipes.