For all modes of transport (sea, air, rail, road and inland waterways) the classification (grouping) of dangerous goods, by type of risk involved, has been drawn up by the UNITED NATIONS Committee of Experts on the Transport of Dangerous Goods (UN). Based on this framework of grouping and for the purpose of carriage by sea, IMO Classes comprise the following, which are further subdivided as indicated:

Dangerous goods, marine pollutants and material hazardous only in Bulk (MHB)
Please Note: New printed labels of IMO classes 2, 3, 4, 5, 6, 8 and 9 are without text.
For maritime transport these goods, materials or articles are classified and further divided as follows: