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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Link to relevant study record(s)

Reference
Endpoint:
explosiveness, other
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-04-23 - 2018-06-14
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
UN Manual of Tests and Criteria: Part I: Classification procedures, test methods and criteria relating to explosives of Class 1
Version / remarks:
Recommendations on the TRANSPORT OF DANGEROUS GOODS: Manual of Tests and Criteria, 6th edition, New York and Geneva, 2015: Class 1
Class 1 Test series 1 / 2, Test 1(b) / 2(b): Koenen Test
Class 1 Test series 1 / 2, Test 1(c) / 2(c): Time Pressure Test
Class 4, division 4.1: Test series F, Test F.3: Trauzl Test
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD113
Version / remarks:
OECD Test Guideline 113 (1981) Screening Test for Thermal Stability and Stability in Air
Deviations:
no
Principles of method if other than guideline:
Thermal Stability OECD 113:
In this test, the thermal stability of the test item is investigated by DSC (differential scanning calorimetry) additional. With this method the difference in energy input into the test item and a reference material as a function of temperature is recorded, while the substance and reference material are subjected to the same temperature program. This energy is the energy necessary to establish zero temperature difference between the test item and the reference material. When the sample undergoes a transition involving a change of enthalpy, that change is indicated by an endothermic departure (e.g. melting, boiling) from the base line of the heat flow record. As result, one gets a thermogram in which the transition heat flux is exhibited as a function of the temperature. In this diagram, the onset of the reaction (e.g. decomposition, physical process) as well of the heat-flux of the reaction is shown.
GLP compliance:
yes (incl. QA statement)
Specific details on test material used for the study:
Storage conditions: Room temperature (approx. 20 °C), protected from light
Key result
Test series:
UN Test series 1
Method:
UN Test 1 (a): UN gap test
Parameter:
other: Trauzl test
Result:
result is considered "-" (negative)
Remarks on result:
other: expansion of 3.4 ml per 10 g in Trauzl test
Key result
Test series:
UN Test series 1
Method:
UN Test 1 (b): Koenen test
Parameter:
limiting diameter (mm)
Result:
result is considered "-" (negative)
Remarks on result:
other: test series with a 1.0 mm diameter orifice plate showed no explosion
Key result
Test series:
UN Test series 1
Method:
UN Test 1 (c) (i): Time/pressure test
Parameter:
other: pressure
Result:
result is considered "-" (negative)
Remarks on result:
p < 2070 kPa
Interpretation of results:
GHS criteria not met
Conclusions:
The test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation and GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.
Executive summary:

Thermal Stability: The test item in closed glass crucibles showed two exothermic effects in the temperature range of 170 – 410 °C, with an overall decomposition energy of -1250 J/g.

Explosive Properties UN Class 1: In the DSC-measurement the energy of the exothermic decomposition of the test item Tris(hydroxymethyl)phosphine oxide (THPO) was above the threshold of - 500 J/g. Therefore, further tests for explosive properties had to be performed.

In the test on explosive properties according to UN Transport Regulation, Test series 1 and 2 (Koenen- and Time-Pressure Test), and Test series F (BAM Trauzl Test) the test item showed no explosive properties.

According to the results of the test on thermal stability and explosive properties, the test item is classified as following:

UN Transport Regulation: The test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation.

GHS (CLP Regulation EC 1272/2008: Annex 1: 2.1): The test item does not have to be classified as explosive substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.

Description of key information

Explosiveness (determined using OECD 113 / UN Manual of Tests and Criteria: Part I; GLP):

- in the DSC-measurement the energy of the exothermic decomposition of the test item Tris(hydroxymethyl)phosphine oxide (THPO) was above the threshold of - 500 J/g;

- in the test on explosive properties according to UN Transport Regulation, Test series 1 and 2 (Koenen- and Time-Pressure Test), and Test series F (BAM Trauzl Test) the substance THPO showed no explosive properties.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

The explosive properties of the test material were determined using OECD 113 / UN Manual of Tests and Criteria: Part I.  

A reliability score of 1 was assigned, in accordance with the criteria for assigning data quality in line with the principles described by Klimisch (1997).

Justification for classification or non-classification

According to the results of the test on thermal stability and explosive properties, the substance THPO is classified as following:

- UN Transport Regulation: THPO does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation.

- GHS (CLP Regulation EC 1272/2008: Annex 1: 2.1): THPO does not have to be classified as explosive substance according to EU GHS.