Division 1.5
Division 1.5 consists of very insensitive explosives. This division is comprised of substances which have a mass explosion hazard but are so insensitive that there is very little probability of initiation or of transition from burning to detonation under normal conditions of transport.

Examples include ammonium nitrate and ammonium nitrate fertilizers.
An orange diamond placard with a large black 1.5 at the top, the words Blasting Agents in the middle, underneath that the number 1.