Mixing chemical substances: determining the CLP classification : Determine the CLP classification of your mixture on the basis of the equivalence rules

Determine the CLP classification of your mixture on the basis of the equivalence rules
Mixing chemical substances: determining the CLP classification

Author : Gautier VINCENT

Publication date: May 10, 2025 | Lire en français

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2. Determine the CLP classification of your mixture on the basis of the equivalence rules

The rules for equivalence are set out in Annex I of the CLP regulation. They are generally common-sense practices. They are presented below, together with their field of applicability.

2.1 Dilution rule

A mixture A is diluted by a substance B which belongs to a hazard category equivalent to or lower than the least toxic component of the mixture. Substance B has no impact on the behavior of the other components. The new mixture is classified as the original mixture.

This rule applies in particular to irritant mixtures to which a non-hazardous component is added, or to corrosive mixtures to which a non-hazardous or irritant component is added.

The main disadvantage of this rule is that it determines a majoritarian...

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Determine the CLP classification of your mixture on the basis of the equivalence rules