It is the principle of the test that based on a stepwise procedure, sufficient information is obtained on the acute inhalation toxicity of the test chemical during an exposure period of 4 hours to enable its classification.
Katse seisneb selles, et astmelise meetodiga kogutakse neljatunnise kokkupuute jooksul uuritava kemikaali sissehingamisel tekkiva ägeda mürgisuse kohta piisavalt teavet aine klassifitseerimiseks.