Hydrogen cyanide - HCN

This page presents information on hydrogen cyanide – or hydrocyanic acid: characteristics, effects on health, detection devices & systems - hydrogen cyanide detector - and respiratory protective equipment (gas mask or PAPR with B gas filter).

Hydrogen cyanide (HCN) properties

Hydrogen cyanide (HCN) - also called hydrocyanic acid or formonitrile – is a chemical compound that can be found in either liquid or gaseous form. Widely used as an insecticide, it is also applied for fumigation applications in the chemical industry. It can be accidentally produced during chemical reactions between cyanide and an acid, or through fire and nitriles combustion.

CAS TWA (8 hours) STEL (15 minutes) LEL IP Density / Air Filter / Air
74-90-8 0,9 ppm 4,5 ppm 5.6 % 13.6 eV 0.94 B

Hydrogen cyanide effects on health

With variant color from colorless to pale blue, hydrogen cyanide (HCN) is easily detectable through its bitter almond smell. This highly toxic gas (T+) features many harmful or lethal properties. With explosive limits between 5.6 and 40%, this chemical compound is extremely flammable (F+).


Hydrogen cyanide effects on health (HCN)

Hydrogen cyanide effects on health

Hydrogen cyanide detector (HCN)

Hydrogen cyanide respiratory protection (HCN)