Resinoid of Liquidambar styraciflua (Hamamelidaceae) obtained from exudate by organic solvents extraction

Explosiveness

Link to relevant study record(s)

Reference

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

key study

Study period:

experimental dates: 23 to 27/03/2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted according to an internationally recognised method, and under GLP, with no deviation. The substance is considered to be adequately characterised. Therefore full validation applies.

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

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: OECD 113 “Screening Test for Thermal Stability and Stability in Air”

Version / remarks:

12. May 1981

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Landesamt für Umwelt (inspected on 15 & 16 November 2017 / signed on 15 May 2018)

Specific details on test material used for the study:

STORAGE CONDITIONS OF TEST MATERIAL
in the closed original metal bottle at 3.3 – 7.3 °C under inert gas (argon).

Key result

Parameter:

other: DSC screening test

Remarks on result:

negative (not further specified)

Remarks:

< 18 J/g

Safety pre-test 1

When heated on a magnesia groove over a Bunsen burner, the test item started to boil. The test item became black at the surface and burned with an orange sooting flame.

When the test item was beaten with a hammer on the anvil, no reaction was observed.

Safety pre-test 2

After reaching a temperature of 520°C and cooling down the weight of the crucible was recorded with 624.97 mg, the gold sealing of the crucible was bulged outwards.

Then the crucible was opened, the gold sealing was brown discolored at the inside and the test item was black. An odour like motor oil was noted.

DSC Screening of the Test Item

After a small endothermal event at 81.3°C, a series of small endo and exo events were recorded between ca 360 and 400°C, likely caused by decomposition. Only the two major exothermal signals were integrated:

	Temperature[°C]	Energy
Exothermal event 1	367.42 (Onset)	-17.9375 [J/g] (the minus symbol is stated for the energy of exothermic event)
Exothermal event 2	387.84 (Onset)	-11.9304 [J/g] (the minus symbol is stated for the energy of exothermic event)

After measurement, the weight of the crucible was recorded with 626.12 mg; the gold sealing was coppery discoloured at the outside. At the inside the crucible and the sealing was black discoloured.

Based on the exothermal event, it is stated that the released energy is less than 500 J/g and the onset of exothermic decomposition is below 500 °C; therefore the acceptance procedures for Class 1 explosives need not to be applied, according to the UN Handbook “Recommendations on the Transport of Dangerous Goods; Manual of Tests and Criteria” (2015).

Interpretation of results:

GHS criteria not met

Conclusions:

The released energy is much less than 500 J/g, the acceptance procedures for Class 1 explosives need not to be applied.
No additional testing is required. The substance shall not be classified as explosive according to Regulation (EC) N°1272/2008 (CLP).

Executive summary:

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

During the DSC run, many slightly exothermal events caused by decomposition were observed, starting from ca 360°C. Therefore only the biggest events were integrated to derive the related energy (in J/g). Up to the maximum test temperature of 520°C, the maximum energy release was 18 J/g.

Description of key information

DSC screening test: maximum decomposition energy 18 J/g up to 520°C (<< 500 J/g).

Key value for chemical safety assessment

Explosiveness:

non explosive

Additional information

A fully reliable experimental study, conducted in accordance with conditions recommended in UN MTC screening procedures/OECD guideline, and under GLP, is available. It is considered as a key study. The result is retained as key data.

No further testing is required.

Justification for classification or non-classification

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