“…1 The addition of reactive inorganic fillers can considerably modify their solvent resistivity because of strong bonding between fillers and diffusive liquids. 2 The glass-fiber reinforced polymer (GRP) composite has been proposed and tried for critical marine components such as masts, submarine control surfaces, transmission shafts and propellers. This follows the application of GRP composites in primary structures of ships including hull, decks and structural bulkheads, and also to superstructure, nonstructural bulkheads, submarine casings, sonar domes, and radomes etc.…”