Subsidiary hazards (sub-hazards)
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Subsidiary hazards (sub-hazards)
Most substances have a single dangerous property, and when classified this becomes the hazard “CLASS”. Some substances have more than one dangerous property e.g. a toxic liquid may also be flammable. The degrees of hazard for each property of a substance are determined by classification. These are then compared against each other in a UN Table of Hazard Precedence (IMDG 2.0.3). The table will indicate which of the hazards is the most prominent, and this becomes the CLASS. The hazard(s) judged to be the lesser hazard(s) becomes the “SUBSIDIARY HAZARD(S)”.
Any class of dangerous goods except Class 9 may potentially have a subsidiary hazard.
When describing dangerous goods in any document, any applicable sub-hazards must be included in brackets after the main class e.g. UN 3405, BARIUM CHLORATE SOLUTION, 5.1, (6.1)