OECD Guidelines for the Testing of Chemicals, Section 4
- 2074-5788 (online)
The OECD Guidelines for the Testing of Chemicals is a collection of about 150 of the most relevant internationally agreed testing methods used by government, industry and independent laboratories to identify and characterise potential hazards of chemicals. They are a set of tools for professionals, used primarily in regulatory safety testing and subsequent chemical and chemical product notification, chemical registration and in chemical evaluation. They can also be used for the selection and ranking of candidate chemicals during the development of new chemicals and products and in toxicology research. This group of tests covers health effects.
Test No. 436: Acute Inhalation Toxicity – Acute Toxic Class Method
- 08 Sep 2009
- 9789264076037 (PDF)
The method described by this Test Guideline provides information that allows hazard assessment for short-term exposure to a test article by inhalation, and allows the substance to be classified according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). The test method is based on a stepwise procedure, each step using 3 animals of each sex (the preferred species is rat). Animals are exposed in inhalation chambers to a pre-defined concentration for 4 hours. Absence or presence of compound-related mortality of the animals at one step will determine the next step. Animals in severe pain or distress should be humanely killed. The starting concentration is selected from one of four fixed levels corresponding to GHS categories 1-4 for gases, vapours or aerosols. Animals are observed daily for clinical signs of toxicity for a total of at least 14 days. Animals' body weights should be determined at least weekly. All the animals should be subjected to gross necropsy.