User Guide to Thresholds and Classification - Environmental ...

84User Guide for Thresholds and ClassificationsG 5.2GNotes:UN PG United Nations Packing Group.* Gas means a substance that: (a) has a vapour pressure > 300 kPa at 50ºC, or (b) is completely gaseous at20ºC and a standard pressure of 101.3 kPa.† Generally equivalent to the classification system for UN class 5.2, as contained in the UN Model Regulations.Note that in the case of subclass 5.2 (organic peroxides), if a substance does not meet the criteria for a 5.2A,5.2B, or 5.2C hazard classification, then a 5.2D classification applies, unless sufficient data are provided thatshow the substance meets the criteria for hazard classifications 5.2E, 5.2F, or 5.2G.With respect to the criteria in the Hazardous Substances (Classification) Regulations 2001 for subclass 5.2,Test Series A–G refer to the tests for self-reactive substances and organic peroxides in sections 21–27,respectively, of the UN Manual of Tests and Criteria.7.5. Oxidising substances – subclasses 5.1.1 and 5.1.2If a substance meets any one of the threshold criteria described in the following sections, it is considered anoxidising substance within the meaning of the HSNO Act.7.5.1. Threshold criteria for oxidising substances not organic peroxides – subclasses 5.1.1and 5.1.2 (equivalent to UN division 5.1)A substance is considered an oxidising substance (not an organic peroxide), within the meaning of theHSNO Act if one of the following is true.a. It is a substance that is not an organic peroxide and is listed in the Dangerous Goods List, chapter 3.2 ofthe UN Model Regulations as having a class, division, or subsidiary risk of 5.1 (denoting it as an oxidisingsubstance).b. It is a solid that is not an organic peroxide, which, when tested in the form in which it is generallyavailable, it is found that the test mixture of the substance with dried cellulose either spontaneouslyignites or shows a mean burn time equal to or faster than that of the 3:7 reference mixture by mass ofpotassium bromate and cellulose when tested under the same conditions as described in the standardtest. The standard test is that prescribed for oxidising solids in Test Series O.1 (para 34.4.1, UN Manualof Tests and Criteria).c. It is a liquid that is not an organic peroxide, and that when mixed with dried cellulose either spontaneouslyignites or shows a mean pressure rise time that is equal to or faster than the mean pressure rise time ofthe 1:1 reference mixture of 65% aqueous nitric acid solution and cellulose under the same conditionswhen tested in accordance with the test method for oxidising liquids set out in Test O.2 (para 34.4.2, UNManual of Tests and Criteria).January 2012 EPA0109