material that produces a lethal dose or a lethal concentration within any of the following categories : a chemical or substance that has a median lethal dose (LD superscript 50) of more than 50 mg per kilogram but not more than 500 mg per kilogram of body weight when administered orally to albino rats weighing between 200 and 300 g each a chemical or substance that has a median lethal dose (LD superscript 50) of more than 200 mg per kilogram but not more than 1000 mg per kilogram of body weight when administered by continuous contact for 24 hours (or less if death occurs within 24 hours) with the bare skin of albino rabbits weighing between 2 or 3 kg each a chemical or substance that has a median lethal concentration (LC superscript 50) in air more than 200 parts per million (ppm) but not more than 2000 ppm by volume of gas or vapor, or more than 2 mg per liter but not more than 20 mg per liter of mist, fume or dust when administered by continuous inhalation for one hour (or less if death occurs within one hour) to albino rats weighing between 200 and 300 g each. SEMI S2-93]






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