What are the Seven main groups of hazardous substances defined by classification's packaging and labelling of dangerous substances regulations?

Answer:

the seven main groups are: Harmful, Irritant, corrosive, Extremely flammable/Flammable, Explosive, Oxidising and Very toxic/Toxic.

First answer by Abe Normal. Last edit by Abe Normal. Contributor trust: 33 [recommend contributor recommended]. Question popularity: 5 [recommend question].