User Guide to Thresholds and Classification - Environmental ...

86User Guide for Thresholds and Classificationsa. The substance is listed in the UN Model Regulations as having a classification, division, orsubsidiary risk of an oxidising substance, division 5.1, and is assigned PG I.b. The substance is a solid and when mixed with dried cellulose it forms a mixture that eitherspontaneously ignites or shows a mean burning time faster (that is, a shorter time) than the meanburning time of a 3:2 reference mixture by mass of potassium bromate and cellulose, under thesame conditions when tested as prescribed for solids in Test O.1 (para 34.4.1, UN Manual of Testsand Criteria).c. The substance is a liquid and when mixed with dry cellulose it forms a mixture that eitherspontaneously ignites or shows a mean pressure rise time faster than the mean pressure rise time ofa 1:1 reference mixture by mass of 50% perchloric acid and cellulose, under the same conditionswhen tested as prescribed for liquids in Test O.2 (para 34.4.2, UN Manual of Tests and Criteria).Category B (oxidising substances that are solids or liquids: medium hazard) – classification 5.1.1B(equivalent to UN PG II)a. The substance is listed in the UN Model Regulations as having a classification, division, orsubsidiary risk of an oxidising substance, division 5.1, and is assigned PG II.b. The substance is a solid and when mixed with dry cellulose it forms a mixture that shows a meanburning time equal to or faster (that is, a shorter time) than the mean burning time of a 2:3 referencemixture by mass of potassium bromate and cellulose, under the same conditions when tested asprescribed for solids in Test O.1 (para 34.4.1, UN Manual of Tests and Criteria), and the criteria for aclassification of category A are not met.c. The substance is a liquid and when mixed with dry cellulose it forms a mixture that shows a meanpressure rise time equal to or faster than the mean pressure rise time of a 1:1 reference mixture bymass of 40% aqueous sodium chlorate solution and cellulose, under the same conditions whentested as prescribed for liquids in Test O.2 (para 34.4.2, UN Manual of Tests and Criteria), and thecriteria for a classification of category A are not met.Category C (oxidising substances that are solids or liquids: low hazard) – classification 5.1.1C(equivalent to UN PG III)a. The substance is listed in the UN Model Regulations as having a classification, division, orsubsidiary risk of an oxidising substance, division 5.1, and is assigned UN PG III.b. The substance is a solid and when mixed with dry cellulose it forms a mixture which shows a meanburning time equal to or faster (that is, a shorter time) than the mean burning time of a 3:7 referencemixture by mass of potassium bromate and cellulose, under the same conditions when tested asprescribed for solids in Test O.1 (para 34.4.1, UN Manual of Tests and Criteria), and the criteria for aclassification of category A or category B are not met.c. The substance is a liquid and when mixed with dry cellulose it forms a mixture which shows a meanpressure rise time equal to or faster than the mean pressure rise time of a 1:1 reference mixture byJanuary 2012 EPA0109