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2.25 (1) The packing group for a substance that is included in Class 5.1, Oxidizing Substances, must be determined by using a test sample of the substance that
(a) in the case of a solid, is prepared in accordance with section 2.5.2.2 of Chapter 2.5 of the UN Recommendations; and
(b) in the case of a liquid, is prepared in accordance with section 2.5.2.3 of Chapter 2.5 of the UN Recommendations.
(2) In the case of a solid substance included in Class 5.1, Oxidizing Substances, the test procedure set out in either subsection 34.4.1 (test O.1) or subsection 34.4.3 (test O.3) of Part III of the Manual of Tests and Criteria must be carried out on the test sample. The substance is included in
(a) Packing Group I, if the test sample exhibits an average burning time that is
(i) less than the mean burning time of a 3:2 potassium bromate/cellulose mixture by mass when test O.1 is used, or
(ii) greater than the mean burning rate of a 3:1 calcium peroxide/cellulose mixture by mass when test O.3 is used;
(b) Packing Group II, if the criteria for Packing Group I are not met and the test sample exhibits an average burning time that is
(i) less than or equal to the mean burning time of a 2:3 potassium bromate/cellulose mixture by mass, when test O.1 is used, or
(ii) equal to or greater than the mean burning rate of a 1:1 calcium peroxide/cellulose mixture by mass, when test O.3 is used; or
(c) Packing Group III, if the criteria for Packing Groups I and II are not met and the test sample exhibits an average burning time that is
(i) less than or equal to the mean burning time of a 3:7 potassium bromate/cellulose mixture by mass, when test O.1 is used, or
(ii) equal to or greater than the mean burning rate of a 1:2 calcium peroxide/cellulose mixture by mass, when test O.3 is used.
(2.1) In the case of a liquid substance included in Class 5.1, Oxidizing Substances, the test procedure set out in sub-section 34.4.2 (test O.2) of Part III of the Manual of Tests and Criteria must be carried out on the test sample. The substance is included in
(a) Packing Group I, if the test sample in a 1:1 mixture by mass of substance and cellulose spontaneously ignites or the mean pressure rise time is less than that of a 1:1 mixture by mass of 50% perchloric acid and cellulose;
(b) Packing Group II, if the mean pressure rise time is less than or equal to the mean pressure rise time of a 1:1 mixture by mass of 40% aqueous sodium chlorate solution and cellulose and the criteria for inclusion in Packing Group I are not met; or
(c) Packing Group III, if the mean pressure rise time is less than or equal to the mean pressure rise time of a 1:1 mixture by mass of 65% aqueous nitric acid solution and cellulose and the criteria for inclusion in Packing Group I or II are not met.
(3) Class 5.2, Organic Peroxides, are included in Packing Group II.
(4) The type, B to F, of organic peroxides must be determined in accordance with section 2.5.3.3 of Chapter 2.5 of the UN Recommendations.
SOR/2017-137, s. 24