Self-classification is the process through which the supplier classifies the chemicals directly, and where no harmonised classifications are available for the substances involved.
Self-classification is always necessary for chemical mixtures.
A harmonised classification is a classification for a substance that has been agreed by independent experts at European level, and then made mandatory by law.
About 8000 of the most commonly used substances have been assigned harmonised classifications.
A harmonised classification is legally binding and suppliers are obliged to use these classifications.
The list of harmonised classifications can be found in Annex VI of the CLP Regulation. This list is amended from time to time to keep up to date with scientific and technical developments (see Get involved).