User Guide to Thresholds and Classification - Environmental ...

33User Guide for Thresholds and ClassificationsDangerous Goods Act (for example, flammable liquids with flashpoints between 61°C and 93°C that are notfuel oils such as some high flashpoint solvents and cutback bitumen). On the other hand, some substancessubject to the Dangerous Goods Act are not captured by the HSNO Act threshold for flammability (forexample, fuel oils with a flashpoint higher than 93°C). The HSNO Act definition of a flammable gas reflectsthe definitions in the Globally Harmonised System for Classification and Labelling of Chemicals (UnitedNations, 2007) and is wider than the previous Dangerous Goods Act definition.3.2. DefinitionsThe following terms include those used in the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001 and the Hazardous Substances (Classification) Regulations 2001 with respect toflammable substances. They are particularly relevant to chapters 3–6.TermASTMclosed cup flashpoint testDatadesensitising agentflammability, flammableflammable ingredientflammable rangeflammable vapourflashpointgDefinitionWhen followed by letters and numbers, means the document identified by thoseletters and numbers that is published by the American Society for Testing andMaterials.An internationally recognised test method in which a set volume of a liquid is heatedin a closed vessel of prescribed dimensions, and to which an ignition source isperiodically introduced, until a temperature is reached at which the vapour above theliquid ignites. This temperature is known as the flashpoint of the liquid. Severalstandard methods can be used for this test (see section 5.1.3 in chapter 5).Includes values that are directly measured, calculated, or estimated for any of themeasures given.A substance or material that, when mixed with a class 1, class 4.1.2, or class 5.2substance produces a mixture that has reduced hazardous properties (in terms ofthose classifications) compared with the original class 1, class 4.1.2, or class 5.2substance.The ability of a substance to be ignited and to support combustion in air at 20°C and101.3 kPa absolute pressure.Any substance that meets one or more of the threshold criteria for a ‗flammable gas‘,‗flammable liquid‘, ‗flammable solid‘, or any combination thereof.The range between two ratios of flammable gas or vapour to air, the lower of whichcontains too much air and the upper of which contains too little air, to be able tosupport combustion. It includes a minimal range effectively equivalent to a singlevalue.The gaseous form of a normally liquid or solid substance that is flammable.The lowest temperature at which a flammable liquid gives off sufficient vapour to forma flammable mixture with air that ignites momentarily, when tested in any closed cupflashpoint test.gram(s)January 2012 EPA0109