MFMB is used for exposed structural boundaries such as the shell, bulkheads, and decks (the shell boundaries and decks of ships are critical paths of heat flow) and also to thermally separate the compartments.
MFMB is a special product made out off resin bonded fibreglass wool conforming to Naval Engineering Standard. It is manufactured in board form with smooth surface finish. As per the requirement it can be in various specified thickness. Top layer is properly laminated with Type E glass fibre cloth.