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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties


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Administrative data

Link to relevant study record(s)

Description of key information

In accordance with column 2 adaptation statement of Annex VII Regulation (EC) No 1907/2006 (REACH) and ‘Manual of Tests and Criteria’ (fourth revised edition, appendix 6, section 3.3 (UN RTDG MTC)), the determination of the explosive properties (required in section 7.11) was waived based on a structural assessment of the substance. 4-Hydroxy TEMPO contains functional groups quoted in UN RTDG MTC and Bretherick’s – Handbook (6th Edition, Volume 2, p 128 ff) which may indicate explosive properties. According to section 3.3 (b) of UN RTFG MTC the test is not required when the substance contains chemical groups associated with explosive properties which include oxygen and the calculated oxygen balance is less then -200.  The oxygen balance for 4-Hydroxy-TEMPO was calculated to be -230.78663. Thus the oxygen balance is below the threshold value of -200. Therefore, it can be concluded by expert judgement that this substance is not explosive and no further testing is required.

Key value for chemical safety assessment

non explosive

Additional information

Justification for classification or non-classification