Phenylacetylene

Explosiveness

Administrative data

Endpoint:

explosive properties of explosives

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is an organic substance or mixture containing chemical groups associated with explosive properties, but the exothermic decomposition energy is less than 500 J/g and the onset of exothermic decomposition is below 500°C

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
According to REACh Annex VII / column 2, the study does not need to be conducted if the organic substance or a homogenous mixture of organic substances contains chemical groups associated with explosive properties, but the exothermic decomposition energy is less than 500 J/g and the onset of exothermic decomposition is below 500 °C.

Based on criteria from:
- Regulation (EC) N°1272/2008 (CLP) Annex I, §2.1.4.,
- UN Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria (7th revised edition, 2019), Appendix 6 Screening procedures §A6.3)
- ECHA endpoint specific guidance on Information Requirements (R.7a, v6.0, July 2017, §R.7.1.11), the exothermic released energy of decomposition is less than 500 J/g, therefore, the explosive properties are not anticipated, and the acceptance procedure for Class 1 explosives shall not apply. No further testing is required.

Cross-reference

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

08-14 March 2022

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

The study was conducted according to an internationally recognised method, and under GLP. No deviation affected the quality of the study. The substance is adequately identified. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)

Version / remarks:

1981

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

GLP-BESCHEININGUNG Statement of GLP Compliance (inspected on 28-29 Avril 2021, signed on 21 June 2021)

Test substance thermally stable:

ambiguous

Remarks:

exothermic event at 56.07°C [assuming decomposition]

Key result

Operating temp.:

>= 0 - <= 520 °C

Remarks on result:

other: An unique exothermic event was observed at 56.07 °C (onset)

Sublimation:

not determined

Transformation products:

not specified

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

Results

Table 1 - Values DSC Indium (Calibration)

Expected Melting point	Measured Melting point	Expected Energy	Measured Energy	Assessment
156.6 ± 1.0°C	156.41 °C	28.45 ± 1.0 J/g	28.41 J/g	OK

Table 2 - DSC Screening of the Test Item

	Temperature [°C]	Energy [J/g]
Exothermal event	56.07 (Onset)	-142.79 (the minus symbol is stated for the energy of exothermic event)

The crucible was visually unchanged after the test.

 

Conclusions:

The released energy at 56.07°C (onset) was determined to be 142.79 J/g.

Executive summary:

The thermal profile of the test substance between 0°C and 520°C was determined during a GLP study according to the OECD giuidelmine, using a DSC method.

During the DSC run an exothermic event was observed at an onset of 56.07 °C and this was integrated to derive the related energy (in J/g). The related energy of the observed exothermic event was 142.79 J/g.