User Guide to Thresholds and Classification - Environmental ...

83User Guide for Thresholds and Classifications7.4. Oxidising property classificationFor substances with an oxidising property, classification generally follows the degree to which these effectsare observed to occur when the substance is tested. The classification systems for oxidising substances andorganic peroxides are generally consistent with those given in the UN Model Regulations, with the testcriteria being those contained in the UN Manual of Tests and Criteria (United Nations, 1999a).Oxidising substances are divided into:subclass 5.1.1 for solids and liquids (see section 7.5);subclass 5.1.2 for gases (see section 7.5); andsubclass 5.2 for organic peroxides (see section 7.6).Subclasses 5.1.1 and 5.2 are divided into several categories representing different degrees of hazard.Subclass 5.1.2 has only one category.An oxidising substance or organic peroxide is classified as having a particular hazard classification if it meetsthe criteria set out in the table in Schedule 3 to the Hazardous Substances (Classification) Regulations 2001for that hazard classification.The classification systems for oxidising substances and organic peroxides are summarised in Table 7.1.Table 7.1: Classification systems for oxidising substances and organic peroxidesDegreeofhazardNature of oxidising hazardOxidisers (liquids/solids)5.1.1Oxidising gases *5.1.2Organic peroxides †5.25.1.2AA5.1.1A(equivalent to UN PG I)Promotes combustion ata greater rate than airdoes5.2AB5.1.1B(equivalent to UN PG II)5.2BC5.1.1C(equivalent to UN PG III)5.2CD 5.2DE 5.2EF 5.2FJanuary 2012 EPA0109