compartments if the desired temperatures are to be maintained economically.
Cork, glass fibre, and various foam plastics in sheet or granulated form
may be used for insulating purposes, also air spaces which are less efficient.
Glass fibre is often used in modern ships as it has a number of advantages
over the other materials; for example, it is extremely light, vermin-proof, and
fire-resistant, and it will not absorb moisture. On the decks and particularly
at the tank top the insulation must often be load-bearing material, and cork