In most of the cases, suppliers need to decide on the classification of a substance or mixture. This is called self-classification.

There are normally four basic steps to self-classify a substance or a mixture:

  • Collection of available information

  • Evaluation of the adequacy and reliability of the information

  • Review of the information against the classification criteria

  • Decision on classification

The classifications from the previous directives have been turned into CLP classifications. Suppliers may use these translations if both of the following conditions are met:

  • A substance was classified according to the Dangerous Substance Directive before 1 December 2010 or a mixture is classified according to the Dangerous Preparations Directive before 1 June 2015.

  • There are no further data available for the substance or mixture for the considered hazard class.

If required by REACH, manufacturers and importers also need to classify substances which are not placed on the market, such as on-site isolated intermediates, transported intermediates or substances for product and process-orientated research and development (PPORD).

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