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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Oxidising properties

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Administrative data

Link to relevant study record(s)

oxidising solids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because there are no chemical groups present in the molecule which are associated with oxidising properties and hence, the classification procedure does not need to be applied
Justification for type of information:
An expert statement has been issued in which it was concluded that the substance has no oxidising properties.
-Expert statement: see included in study report (see Data Source)
-Expert: M.J.C. Brekelmans, MSc. (WIL Research Europe B.V., The Netherlands)

Expert statement
A test substance is considered an oxidizing substance when the burning time of a mixture of the substance and cellulose in a 4:1 or 1:1 sample-to-cellulose ratio (by mass) is less than or equal to the mean burning time of a 3:7 reference mixture (by mass) of potassium bromate and cellulose.
The test substance does not contain groups that act as an oxidizing agent. The oxygen atoms that are present in the molecular formula of the test substance are present in hydrate groups or hydroxide group. Based on this the test substance is considered to pose no function as oxidizing agent.
In conclusion, TMAH pentahydrate has no oxidizing properties.
Reason / purpose for cross-reference:
data waiving: supporting information
GLP compliance:

Description of key information

From the evaluation of structural features of the substance, i.e. the absence of structural alerts, it was concluded in an expert statement (in accordance with EC A.17, UN TDG-MTC Appendix 6) that the UN classification procedure for oxidizing substances of Division 5.1 or the EC A.17 oxidising properties test does not need to be applied. The substance has no oxidizing properties. 
A statement rather than a full study was considered sufficient to cover this endpoint. The statement was written by an expert in accordance with EC A.17 and UN TDG-MTC Appendix 6 in compliance with the principles of GLP.

Key value for chemical safety assessment

Oxidising properties:

Additional information

Justification for classification or non-classification

Based on structural features, classification for the hazard 'oxidising solid' is not required according to CLP Regulation (EC) No. 1272/2008.