Rn Ships (Plastic Armour) Sir Patrick Wall asked the Secretary of State for Defence what steps he is taking to fit plastic armour over vital spaces in Her Majesty's ships. Mr. Lee Means of protecting Her Majesty's ships from projectiles, including the possible use of ceramic ("plastic") armour, are kept under continuous review.Strengthened steel is used in certain cases to give protection to vital spaces but currently there are no plans to fit ceramic armour.