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Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
experimental dates: 20-21 June 2017
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
significant methodological deficiencies
Remarks:
The study was conducted according to an internationally recognized method, and under GLP, but an experimental issue occured during testing. Test substance is adequately specified. The study is nevertheless considered useful for classification purpose.
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:
Manual of Tests and Criteria; sixth revised edition, UN, 2015, Section 20.2.1, 20.3.3.3 and Appendix 6 Screening procedures
Qualifier:
according to guideline
Guideline:
other: OECD 113 “Screening Test for Thermal Stability and Stability in Air”
Version / remarks:
12. May 1981
GLP compliance:
yes (incl. QA statement)
Remarks:
Landesamt für Umwelt (inspected on 15-16/11/ 2017, signed on 15/05/2018)
Parameter:
other: DSC screening test
Remarks on result:
negative (not further specified)
Remarks:
no exothermal event

Safety pre-test 1

No reaction was observed after the test item was beaten with a hammer on the anvil. The test item burned instantly with strong yellow sooting flame when heating on a magnesia groove over a Bunsen burner.

Safety pre-test 2

After heating in a muffle furnace up to 520 °C the outside of the gold sealed ring was discoloured, inside of the crucible was no significant change. The weight of the crucible after heating was recorded as 621.96 mg (corresponding to 0.14 mg loss, or -4%).

DSC Screening of the Test Item

No significant exothermic event was recorded.

After the test, the mass loss of the crucible was 2.05 mg, corresponding to -100%. The crucible was visually unchanged. The crucible was opened, the inside sealed gold ring was slightly discoloured, no test item remained in the crucible and the crucible smelled like oil.

Interpretation of results:
GHS criteria not met
Conclusions:
No major exothermal reaction is expected from the test substance (assumed less than 500 J/g).
Executive summary:

The thermal stability of the substance was tested, under GLP, in accordance with conditions recommended in UN MTC screening procedure/OECD guideline, with Differential Scanning Calorimetry.

After heating, a significant mass loss was recorded, which does not comply with sealed conditions required. No significant thermal event was observed.

Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
10 Apr. 2018
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Remarks:
The study was conducted with test conditions complying partially with CLP/UN MTC screening procedure, and NOT under GLP (as required for CLP classification purpose). Test substance is adequately specified. Therefore validity applies with restrictions.
Qualifier:
equivalent or similar 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:
Manual of Tests and Criteria; sixth revised edition, UN, 2015, Appendix 6 Screening procedures and Section 20.3.3.3
Deviations:
yes
Remarks:
max T 400°C and air atmosphere
GLP compliance:
no
Parameter:
other: DSC screening test
Remarks on result:
negative (not further specified)
Remarks:
<< 500 J/g

In both runs, four successive weak, wide and flat, exotherms were recorded:

Run Sample mass (mg) Peak Range (°C) T max (°C) dH decomp (J/g)
1 13,10 1 99-150 124 -9
2 185-251 222 -18
3 256-309 280 -8
4 314-396 349 -38
2 13,20 1 99-150 124 -8
2 185-251 223 -17
3 256-309 276 -9
4 314-396 343 -38

The thermograms are provided in the experimental report.

Interpretation of results:
GHS criteria not met
Conclusions:
The exothermal reactions are much below the threshold of 500 J/g.
Executive summary:

The thermal stability of the substance was tested, non-GLP, with the DSC screening procedure, in conditions close to CLP/UN MTC recommendations.

Up to 400°C, in air atmosphere, only minor exotherms, maximum 38 J/g, were recorded.

Description of key information

DSC screening test: no significant exothermal decomposition.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Due to the presence of constituents not fulfilling the exemption criteria, based on chemical structure, an experimental screening test was conducted on the substance, in accordance with conditions recommended in UN MTC screening procedures/OECD guideline, and under GLP. Unfortunately, a leak occurred, and was observed again in a second confirmatory test, as well as with an analogue. Therefore, the study was stopped, and a similar test was conducted, non-GLP, by the sponsor.

Despite both studies show restrictions, in all thermograms recorded, no or only very weak exotherms were observed. Therefore, the Weight-of-Evidence is considered sufficient, for classification purpose, that no major exothermal reaction is expected from the test substance.

Justification for classification or non-classification

The substance is NOT classified as explosive according to CLP criteria, based on screening procedures (exothermic decomposition energy expected < 500 J/g).

The acceptance procedures for Class 1 explosives need not to be applied. No additional testing is required.

Based on the absence of significant exothermal reaction with the standard quality tested, the experiment was considered to cover also the "high alpha pinene" quality.