Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

oxidising liquids
Type of information:
other: statement
Adequacy of study:
key study
Study period:
30 September 2009- 6 January 2010
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The EU method was followed. Based on the molecular structure of the test substance a statement rather than a full study was considered sufficient to cover this endpoint.

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
EU Method A.21 (Oxidising Properties (Liquids))
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Chemical structure
Reference substance name:
Tris(methylphenyl) phosphite
EC Number:
EC Name:
Tris(methylphenyl) phosphite
Cas Number:
Molecular formula:
tris(methylphenyl) phosphite
Details on test material:
- Name of test material (as cited in study report): TTP
- Molecular formula: C21H21PO3
- Molecular weight: 352
- Substance type: Clear colourless liquid
- Physical state: liquid
- Analytical purity:>92,1%
- Impurities: - 7,5% Phosphorochloridous acid, bis-methylphenyl)ester
- 0,4% Cresol
(the initial purity information in the study report (which was 99%) has been corrected with an amendement of the report on 9. Nov 2011)
- Isomers composition: -
- Purity test date: -
- Lot/batch No: HR9C77938
- Expiration date of the lot/batch: 31 March 2010
- Stability under test conditions: Stable
- Storage condition of test material: At room temperature in the dark under nitrogen
- Other: Test substance handling: Reactive to moisture, handle in nitrogen environment in glove box

Results and discussion

Any other information on results incl. tables

According to the EC A.21 guideline, a liquid substance is to be considered as an oxidizer when:

- a 1:1 mixture, by mass, of the substance and cellulose spontaneously ignites; or

- a 1:1 mixture, by mass, of the substance and cellulose exhibits a mean pressure rise time less than or equal to the mean pressure rise time of a 1:1 mixture, by mass, of 65% (w/w) aqueous nitric acid and cellulose.


Examination of the structure of the test substance establishes beyond reasonable doubt that the substance is incapable of showing a positive result in the test described in the EC A.21 guideline. The substance does not contain any group that might act as an oxidizing agent. The oxygen atom that is present in the chemical is bonded to carbon or phosphor, which indicates that the molecule is oxygen-deficient.

Applicant's summary and conclusion

Interpretation of results:
other: no oxidising properties
Migrated information
In conclusion, TTP has no oxidizing properties.