H4R Categories

The substances being managed within the H4R Consortium, although complex UVCBs, often have similar overall structures and similar properties. Consequently, in order to share data between them, minimising testing and animal usage, to meet the information requirements of Reach, category approaches have been developed to group substances that have similar properties together.

For more information on what category is and how it can be applied within Reach. See the ECHA publication "How to use alternatives to animal testing to fulfil your information requirements for REACH registration"

(ECHA has withdrawn "Practical Guide 6: How to report read-across and categories" and integrated the content into the guide above.)

For each category a Category Justification Document has been prepared. Before a potential registrants uses the H4R documentation support a registration on a specific substance they should satisfy themselves that the substance in which they have an interest meets the applicability domain of the category. This is necessary to ensure that the read across justification was made within the dossers remain valid for the specific substance. These applicability domains can be found within the Category Justification Documents.

The Substances page contains further details of the substances within each Category.


1 - Rosin, hydrogenated rosin and their salts

2 - Rosin esters

3 - Rosin adducts and rosin adducts salts

4 - Rosin adduct esters

8 - Tall oil

9 - Miscellaneous

Hydrocarbon Resins