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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

Negative findings in bacterial reverse mutation test, chromosome aberration test and gene mutation test in mammalian cells.

Additional information

Gene mutation has been investigated in bacteria using strains ofSalmonella typhimuriumandEscherichia coli, in accordance with OECD/EU test methods. Five tester strains TA1535, TA1537, TA98, TA100 and WP2uvrA were used and experiments were performed both in the absence and presence of metabolic activation, using liver S9 fraction from rats pre-treated with phenobarbital and 5,6-benzoflavone. The substance, hexahydrophthalic anhydride (HHPA), did not induce reverse mutation in the tester strains, neither in the absence nor presence of S9 metabolism.


Hexahydrophthalic anhydride (HHPA) was examined for mutagenic activity by assaying for the induction of 5trifluorothymidine resistant mutants in mouse lymphoma L5178Y cells afterin vitrotreatment using OECD/EU test methods. It was concluded that the substance does not induce mutation at the TK locus of L5178Y mouse lymphoma cellsin-vitro.


Hexahydrophthalic anhydride (HHPA) has been assayed for the ability to cause chromosomal damage in cultured human lymphocytes followingin vitrotreatment in the absence and presence of S9 metabolic activation. Methods used were in accordance with OECD/EU test methods. The substance does not induce chromosomal aberrations in human lymphocytes.


REACH Regulation 1907/2006 (Annex VIII, 8.4 Column 2) states that appropriatein vivomutagenicity studies should be considered in those cases of a positive result in any of the in vitro genotoxicity studies. In vitro investigations were negative and in vivo studies are therefore regarded as inappropriate and not in line with current concerns regarding animal welfare and the use of animals in scientific experiments.


Justification for classification or non-classification

Classification, Labelling, and Packaging Regulation (EC) No 1272/2008
The available experimental test data are reliable and suitable for classification purposes under Regulation (EC) No 1272/2008. Based on negative findings in 3 separate key in vitro tests for gene mutation/ mutagenicity, the test item is not classified according to Regulation (EC) No 1272/2008 (CLP), as amended for the tenth time in Regulation (EU) No 2017/776.