The Inventory of Hazardous Materials, IHM, consists of:
  -> Part I: HM contained in ship structure or equipment and referred to in Annexes I and Annexes II of the SRR;
  -> Part II: Operationally generated wastes; and
  -> Part III: Stores.

The development and maintenance of the IHM is a key requirement of the Regulation. The development procedure of a new IHM may differ depending on whether the ship is a new or an existing one. 

The ship owner or the shipbuilder may draw upon assistance by an IHM expert. This is strongly recommended for safety and health protection reasons and in order to have a minimum assurance that the work is carried out by competent personnel, under a quality management system and in accordance with recommended guidance (i.e. the EMSA’s guidance document and the relevant IMO guidelines).