Willow, Salix alba, ext.

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2019-01-16 to 2019-02-22

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids)

Version / remarks:

UN Recommendations on the Transport of Dangerous Goods, Manual of Test and Criteria, 6th revised edition (2015).

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

134 s

Remarks on result:

other: burning with flames

Key result

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

249 s

Remarks on result:

other: burning with flame

 Individualresults

100 % of the test item showed a particle size <500 µm (see report PS20180395-9, IUCLID section 4.5 (Particle size distribution)). Therefore, further grinding or sieving was not necessary. The residual moisture was determined to be 2.8 % after drying at 50 °C under vacuum for 48 h. The test item for the test itself was not dried.

Five tests were performed on the mixture of the test item with cellulose in the ratios 4:1 and 1:1. The results are shown in the following tables.

Table 1: Burning times of test item/cellulose 4:1

t [s]	Reaction
159	At the given time the wire broke, and the flames extinguished. The cones burned down for approximately 50 to 60 %.
136
129
135
109
192	These tests were done with a thicker wire (0.8 mm diameter). At the given time the main reaction ended. At that time approximately 60 to 70 % of the cone had burned down. The wire did not break for at least 10 minutes.
254

The first 5 tests were clearly influenced by the breaking of the wire. Therefore, and as their burning time was not significantly higher than the reference mixture the test was repeated twice with a thicker wire (0.8 mm diameter).

The mean burning time of the mixture of the test item/cellulose 4:1 is 134 s (conservative approach, taking into account only tests 1 to 5).

Table 2: Burning times of test item/cellulose 1:1

t [s]	Reaction
310	At the given time the wire broke, and the flames extinguished. The cones burned down for approximately 80 %.
230
306
205
192

The mean burning time of the mixture of the test item/cellulose 1:1 is 249 s (this mixture was not repeated with a thicker wire as the burning times were already significantly higher than those from the reference mixture).

Five tests were performed on the mixture of the reference substance with cellulose in the ratios 3:7. The results are shown in the following table.

Table 3: Burning times of potassium bromate/cellulose mixtures

Mixture	Test 1 t [s]	Test 2 t [s]	Test 3 t [s]	Test 4 t [s]	Test 5 t [s]	mean burning time [s]
3:7	96	105	128	117	107	111

Due to the fact that the mixture of test item with cellulose (4:1) and the mixture of the test item with cellulose (1:1) burned slower than the reference mixture, it was concluded that the test item has no oxidising properties.[1]

[1]For the 4:1 mixture of test item to cellulose this was additionally confirmed with two measurements using a thicker wire.

Interpretation of results:

GHS criteria not met

Conclusions:

The test item had no oxidising properties (UN test O.1).

Executive summary:

The submission substance was tested for oxidising properties in a reliable and valid test performed compliant with GLP according to UN-tet O.1 (UN Recommendations on the Transport of Dangerous Goods, Manual of Test and Criteria (Rev. 6, 2015) Part III).

Result: The test item had no oxidising properties.

Due to the determined results the test item has not to be classified as “oxidising solid”, division 5.1, of the UN Recommendations on the Transport of Dangerous Goods / Manual of Test and Criteria.

Due to the determined results the test item has not to be classified as “oxidising solid” according to chapter 2.14 of the CLP regulation and of the GHS regulation (1).

(1) UN Globally harmonized system of classification and labelling of chemicals (GHS), 7th revised edition, 2017 (UN GHS); REGULATION (EC) No. 1272/2008 (CLP; EU GHS).

Description of key information

The test item had no oxidising properties (UN test O.1).

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

See below

Justification for classification or non-classification

The submission substance was tested for oxidising properties in a reliable and valid test performed compliant with GLP according to UN-tet O.1 (UN Recommendations on the Transport of Dangerous Goods, Manual of Test and Criteria (Rev. 6, 2015) Part III).

Result: The test item had no oxidising properties.

Due to the determined results the test item has not to be classified as “oxidising solid”, division 5.1, of the UN Recommendations on the Transport of Dangerous Goods / Manual of Test and Criteria.

Due to the determined results the test item has not to be classified as “oxidising solid” according to chapter 2.14 of the CLP regulation and of the GHS regulation (1).

(1) UN Globally harmonized system of classification and labelling of chemicals (GHS), 7th revised edition, 2017 (UN GHS); REGULATION (EC) No. 1272/2008 (CLP; EU GHS).