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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Classification & Labelling & PBT assessment

PBT assessment

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Administrative data

PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB

Taking into account the lack of biodegradation in a ready biodegradation test, the substance 1-hexyl-1H-pyrazol-4,5-diamine hemisulfate is considered as persistent or very persistent on the basis of screening criteria.

At environmental pH, the log Kow of the substance 1-hexyl-1H-pyrazol-4,5-diamine hemisulfate at ambient temperature is 1.287. This low log Kow indicates that the substance has hydrophilic properties and is not considered as bioaccumulable or very bioaccumulable.

The chronic toxicity data assessed on daphnia (reproduction test) and on algae (inhibition of the growth) are higher than 0.1 mg/L and the acute toxicity on fish is higher than 1 mg/L. Therefore 1-hexyl-1H-pyrazol-4,5-diamine hemisulfate is not considered as T on the basis of these aquatic toxicity results. The substance is neither classified as carcinogenic (cat. 1A or 1B), nor germ cell mutagenic (Cat. 1A or 1B), nor toxic for the reproduction ((cat. 1A, 1B or 2). However it is classified  as "Specific Target Organ Toxicity Repeated Exposure category 1 ", and  due to this classification, it has to be considered as Toxic.

The substance 1-hexyl-1H-pyrazol-4,5-diamine hemisulfate is P/vP and Toxic, however it is not bioaccumulable. Therefore it is not considered as PBT or vPvB.