Abbreviation for the International Maritime Dangerous Goods Code published by IMO. Collection of regulations for the transportation of dangerous goods with seagoing vessels. The IMDG Code contains e. g. lists of media (often still referred to wrongly as the "IMCO List"), specifying categories of ships, ship equipment and permitted and prohibited materials for the transport media in question. Mechanical seal designs for bilge pumps must take due account of the media and materials assigned to the particular category of ship.