ORM B
A material (including a solid when wet with water) capable of causing significant damage to a transport vehicle or vessel from leakage during transportation. Materials meeting one or both of the following criteria are ORM B materials: (1) a liquid substance that has a corrosion rate exceeding 0.250in/yr on aluminum (non clad 7075-T6) at a test temperature of 130ฐF; (2) specifically designated by name by DOT.