Hydrogen cyanide

CAS RN: 74-90-8

Range of Toxicity

A) TOXICITY: The average fatal dose of hydrogen cyanide is 50 to 60 mg in humans. Human responses to hydrogen cyanide have been reported: Immediately fatal: 270 ppm (airborne concentration). Fatal after 10 minutes: 181 ppm (airborne concentration). Fatal after 30 minutes: 135 ppm. Fatal after 0.5 to 1 hours without immediate or late effects: 110 to 135 ppm. Tolerated for 0.5 to 1 hour without immediate or late effects: 45 to 54 ppm. Slight symptoms after several hours: 18 to 36 ppm.
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