Why is a mixture classified as \u201cSkin Corr. 1\u201d (Corrosivity to the skin, category 1) despite the fact that no individual component shares this classification?<\/p>\n\n\n\n
An analogous question can be asked for \u201cEye Dam. 1\u201d (Serious eye damage, category 1).<\/p>\n\n\n\n
It can be helpful to take a look at the CLP Regulation, ideally in its consolidated version. Specifically, the relevant passage here is Annex I of the CLP Regulation, Chapter 3.2.3 [1].<\/p>\n\n\n\n
This section clarifies which percentage of components, or the sum of multiple components, must be given the classification of Skin Corr. 1 including the sub-categories 1A, 1B and 1C in order for a mixture to be classified accordingly. Without entering into the nuances here, this total must amount to more than 5% (or more than 3% in the case of Eye Dam. 1).<\/p>\n\n\n\n
Nevertheless, this summation (known as the additivity principle) does not always apply. In particular, this does not apply if a mixture contains at least one component with an extreme pH value. A pH value rates as extreme if it falls below 2 or above 11.5 (limit values included in each case).<\/p>\n\n\n\n