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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

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

Classification & Labelling & PBT assessment

PBT assessment

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Administrative data

PBT assessment: overall result

Type of composition:
legal entity composition of the substance
State / form:
Reference substance:
PBT status:
the substance is not PBT / vPvB

The substance does not meet the P/vP criteria neither the B/vB criteria and fulfils the T criterion. Therefore, the substance is not PBT / vPvB.

Bioaccumulation: On the basis of physicochemical properties (small molecular weight, extreme water solubility, negative log Kow: -1), toxicokinetic properties (transformation into metabolites that are themselves reactive and do not bioaccumulate: most likely hydrazine and formaldehyde) and a total of three consistent BCF predictions (EPIsuite, Caesar: 0.90, 2 and 3.162 L/kg or dimensionless), no bioaccumulation in animals, including aquatic species, is anticipated for MMH. Therefore the substance is considered as non-B.

Persistence: In water, DT50 values are below the thresholds for the P criterion of Annex XIII. No reliable data were available on soil and sediment compartments, but they were considered not critical for persistence assessment. Moreover, the atmosphere was not a relevant compartment for persistence assessment due to minor distribution and Annex XIII does not propose a threshold to conclude on persistence in the atmosphere.

Overall, data on water compartment (the major compartment according to distribution estimates related to the identified uses) are considered quite representative and sufficient for a definitive conclusion at this tonnage level: non-P.

Toxicity: MMH clearly fulfils the T criterion, both for human health (being a carcinogen) and environment (due to high toxicity to water organisms).

Full details / justifications can be found in the PBT assessment record.