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Reference
Endpoint:
explosiveness
Type of information:
experimental study
Adequacy of study:
key study
Study period:
March 20 to 24, 2014
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. The substance is considered to be adequately characterised. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
EU Method A.14 (Explosive properties)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD Test Guideline No. 113 (1981) Screening test for Thermal Stability and Stability in Air
Version / remarks:
1981
Deviations:
no
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:
5th edition, 2009
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
inspected on 22 and 23 January 2013 / signed on 22 March 2013
Parameter:
other: Thermal stability (DSC)
Remarks on result:
negative (not further specified)

Thermal stability (DSC)

The DSC runs PN6406 and PN6424 are shown in figure 1 and figure 2, respectively (see the attached background material section). Up to a temperature of 500°C, no significant effects were detected. The temperature signal at high ranges, could be caused by a gas formation. In such ranges a vapor or gas formation (within the crucible) followed by a rapid condensation when the test item reaches physically the walls of the crucible, could be a reason why the temperature signal increases and decreases so rapidly at high ranges. However, the pressure measurement is not possible using the DSC. After the measurement the crucible was tight otherwise it would be reflected in the results as well as observing the crucible itself. The test item was decomposed.

 

Table 4.14/1: Results of the DSC-measurements

No.

Sample weight /

mm

Onset /°C

Energy /J/g.

PN6406

9.70

-

-

PN6424

13.42

-

-

 

The DSC analysis shows no decomposition of the test item from room temperature to 500°C. Due to the decomposition energy being < 500 J/g, it can be stated that the test item LABDANUM GUM has no explosive properties according to EC 440/2008, Part A, A 14.

Interpretation of results:
non explosive
Conclusions:
LOW potential for explosive properties.
Executive summary:

A DSC-screening test was conducted under GLP according to standard EU/UN/OECD methods to determine the thermal stability of the test item.

Under the test conditions, the analysis shows no decomposition of the test item from room temperature to 500 °C. The decomposition energy being < 500 J/g, it can be stated that the test item has LOW potential for explosive properties.

Description of key information

LOW potential for explosive properties

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

A DSC-screening test was conducted under GLP according to standard EU/UN/OECD methods to determine the thermal stability of the test item.

Under the test conditions, the analysis shows no decomposition of the test item from room temperature to 500 °C. The decomposition energy being < 500 J/g, it can be stated that the test item has LOW potential for explosive properties.

Justification for classification or non-classification

In accordance with column 2 of REACh Annex VII, an explosive properties study does not need to be conducted if an 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.

In addition, according to the screening procedure listed in appendix 6 to the UN Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria, 6th revised edition, 2015), the exothermic decomposition energy may be determined using a suitable calorimetric technique and DSC is strongly recommended to identify potential hazards connected with the substance (see the ECHA endpoint specific guidance on information requirements, R.7a, v6.0, July 2017, §R.7.1.11)

Considering the poor knowledge on the composition of the registered substance, a DSC screening test has been conducted on the substance and the results showed that no explosive properties are anticipated.

Therefore, explosive properties are not anticipated for the registered substance and the acceptance procedure for Class 1 explosives shall not apply. No further testing was considered.