Mutagen 18
Mutagen 18 : An agent that causes a permanent change in the amount or structure of the genetic material in an organism. Under the EC Dangerous Substances Directive, Mutagen Category 3 is the lowest hazard category, i.e. there is evidence of the agent causing genetic damage in mammals but the strength of evidence is not sufficient to place it in a higher category (category 2 or 1; category 1 being for a substance known to be mutagenic in humans)