Willow, Salix alba, ext.

Additional physico-chemical information

Link to relevant study record(s)

Reference

Endpoint:

other: Exothermic decomposition energy

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2019-01-28 to 2019-02-07

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria, Appendix 6

Version / remarks:

rev. 6 (2015)

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: OECD 113 Screening test for thermal stability and stability in air

Version / remarks:

Adopted: 12 May 1981

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Results:

The test item showed an exothermal effect starting at 140 °C with an energy of up to 785 J/g in closed DSC-measurements.

Two DSC measurements in closed glass crucibles showed an exothermal effect in the temperature range of 140 – 435 °C with a maximum energy release of 785 J/g.

A third DSC measurement in a closed high pressure crucible with the test item showed an exothermal effect in the temperature range of 155 – 370 °C with an energy release of 622 J/g.

Graphical presentation of the DSC runs is given in the attached illustration. The results are summarised in the following table:

Thermal stability (DSC measurements)

Ident-No.	Weight / mg	Final temperature / °C	Temperature range / °C	Type of effect	Energy / J/g
38474	12.12	500	140 – 415	Exothermal	601
38476	11.52	500	140 – 435	Exothermal	785
38480	10.38	500	155 – 370	Exothermal	622

Conclusions:

Results from DSC analysis of exothermic decomposition energy, with interpretation according to UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria, rev. 6 (2015), Appendix 6:
The heat of decomposition was above 300 J/g. Therefore additional tests have to be performed for a classification or an exclusion as self-reactive substance.
The heat of decomposition was above 500 J/g. Therefore additional tests have to be performed for a classification or an exclusion as explosive substance.
The heat of decomposition was below 800 J/g. Therefore, neither a Series 1 type (a) propagation of detonation test nor a Series 2 type (a) test of sensitivity to detonative shock is required.

Executive summary:

The submission substance was tested for classification requirements regarding explosiveness and self-reactiveness. According to UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria, rev. 6 (2015), Appendix 6 (Screening Procedures), these properties can be excluded based on analysis of the exothermic decomposition energy. To this end, the exothermic decomposition energy was determined in a reliable and valid test performed compliant with GLP using differential scanning calorimetry under nitrogen in closed crucibles. The study methodology followed the UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria as well as OECD test guideline 113 (Screening test for thermal stability and stability in air).

Results from DSC analysis of exothermic decomposition energy, with interpretation according to UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria, rev. 6 (2015), Appendix 6:

The heat of decomposition was above 300 J/g. Therefore, additional tests have to be performed for a classification or an exclusion as self-reactive substance.

The heat of decomposition was above 500 J/g. Therefore, additional tests have to be performed for a classification or an exclusion as explosive substance.

The heat of decomposition was below 800 J/g. Therefore, neither a Series 1 type (a) propagation of detonation test nor a Series 2 type (a) test of sensitivity to detonative shock is required.

Description of key information

Results from DSC analysis of exothermic decomposition energy, with interpretation according to UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria, rev. 6 (2015), Appendix 6:

The heat of decomposition was above 300 J/g. Therefore additional tests have to be performed for a classification or an exclusion as self-reactive substance.

The heat of decomposition was above 500 J/g. Therefore additional tests have to be performed for a classification or an exclusion as explosive substance.

The heat of decomposition was below 800 J/g. Therefore, neither a Series 1 type (a) propagation of detonation test nor a Series 2 type (a) test of sensitivity to detonative shock is required.

Additional information

The submission substance was tested for classification requirements regarding explosiveness and self-reactiveness. According to UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria, rev. 6 (2015), Appendix 6 (Screening Procedures), these properties can be excluded based on analysis of the exothermic decomposition energy. To this end, the exothermic decomposition energy was determined in a reliable and valid test performed compliant with GLP using differential scanning calorimetry under nitrogen in closed crucibles. The study methodology followed the UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria as well as OECD test guideline 113 (Screening test for thermal stability and stability in air).

Results from DSC analysis of exothermic decomposition energy, with interpretation according to UN Recommendations on the Transport of Dangerous Goods – Manual of Tests and Criteria, rev. 6 (2015), Appendix 6:

The heat of decomposition was above 300 J/g. Therefore, additional tests have to be performed for a classification or an exclusion as self-reactive substance.

The heat of decomposition was above 500 J/g. Therefore, additional tests have to be performed for a classification or an exclusion as explosive substance.

The heat of decomposition was below 800 J/g. Therefore, neither a Series 1 type (a) propagation of detonation test nor a Series 2 type (a) test of sensitivity to detonative shock is required.