Classification and hazards

Lowest temperature at which a substance ignites spontaneously in a normal atmosphere without an external source of ignition.

A category of hazardous materials according to the predominant hazard they present, numbered 1 to 9 (1 Explosives; 2 Gases; 3 Flammable liquids; 4.1, 4.2, 4.3 Flammable solids; 5.1 Oxidizing substances; 5.2 Organic peroxides; 6.1 Toxic; 6.2 Infectious; 7 Radioactive; 8 Corrosive; 9 Miscellaneous).

Letter (A-N, S) identifying the compatibility group of explosive substances and articles of Class 1, used in classification (e.g. 1.1A) and in segregation provisions.

Mark indicating substances that are environmentally hazardous (e.g. marine pollutants), required when the substance meets the criteria of UN 3077 or UN 3082 or is classified as a marine pollutant.

Lowest temperature of a liquid at which its vapours form a flammable mixture with air. Closed-cup measurement is the reference method.

Status of a substance whose transportation is forbidden under the relevant regulation (forbidden entry in the Hazardous Materials List).

Hazard identification number (Kemler code) shown on orange-coloured plates for tank or bulk transportation, indicating the principal hazards of the substance carried.

A substance or mixture identified as hazardous to the aquatic environment and subject to additional marking, documentation and stowage requirements for transportation.

A group to which, for packing purposes, certain substances may be assigned according to their degree of danger: I great danger, II medium danger, III minor danger.

Separation to be maintained between hazardous materials that react dangerously with one another. The IMDG Code establishes four degrees of separation between packages, from away from to separated longitudinally by an intervening complete compartment or hold from, while ADR expresses the same principle as mixed loading prohibitions.

Grouping of hazardous materials having certain similar chemical properties IMDG (SGG1 to SGG18) and used for stowage segregation purposes.

Category assigned in column 16a of the IMDG Code hazardous materials list, from A to E for packaged goods, which determines where the goods may be stowed on board, on deck or under deck, and whether transportation on passenger ships is permitted.

An additional hazard exhibited by a dangerous substance or article in addition to its primary hazard, indicated by the subsidiary hazard label and a Hazardous Materials List column entry.

Category from 0 to 4 assigned to each dangerous good in ADR, which determines the multiplying factor applied to the quantity carried per transport unit and the threshold of 1 000 points of the partial exemption for quantities carried per transport unit.