SDS Studio™Definition: LD50 is the dose and LC50 the concentration of a substance that kills 50 % of test animals (or aquatic organisms) in a defined test, used to classify acute toxicity.
Oral and dermal LD50 values are in mg/kg body weight; inhalation LC50 in mg/l over 4 hours; aquatic LC50 in mg/l over 96 hours for fish.
They are reported in SDS section 11 (human health) and section 12 (aquatic toxicity) with species, method and source.