Disodium tartrate

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25 November - 30 November 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Version / remarks:

Adoptation 2008

Deviations:

no

GLP compliance:

no

Specific details on test material used for the study:

Storage conditions: ambient temperature (10 – 30 °C)

Contact with:

powdered cellulose

Sample tested:

test mixture as specified

Remarks:

test item:cellulose - 2:1

Parameter:

preliminary test

Remarks on result:

mixture does not ignite and burn

Sample tested:

test mixture as specified

Remarks:

barium nitrate:cellulose - 2:1

Parameter:

preliminary test

Remarks on result:

other: 3 test mixtures burned down completely in 58, 64 and 57 s.

Sample tested:

reference mixture as specified

Remarks:

barium nitrate/cellulose with different wt. % oxidizer

Parameter:

maximum burning rate

Result:

1.72 mm/s

Remarks on result:

other: oxidizer ratio 55% wt.

Sample tested:

test mixture as specified

Remarks:

test item:cellulose with various wt.% cellulose

Parameter:

burning time of reaction over a distance of 200 mm

Remarks on result:

slow smouldering

Remarks:

could not be ignited when test item amount was more than 90% wt.

Results
Preliminary test
Three test mixtures with test item and cellulose 2:1 could not be ignited.

Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 58, 64 and 57 s, respectively. Due to the preliminary test results, the main test had to be executed.

Main Test
Four tests were done for the reference mixture (barium nitrate and cellulose) with different wt. % oxidizer (barium nitrate). The results are presented in Table 1.

Table 1 – Burning times and rates of reference mixtures

Barium nitrate [wt. %]	Burning time over 200 mm [s]	Burning rate [mm/s]
50	139	1.44
55	116	1.72
60	117	1.71
70	190	1.05

 

The highest burning rate of 1.72 mm/s was found for the mixture with 55 wt. % oxidizer.

Mixtures of the test item with cellulose were prepared with different wt. % (10 - 90%) of the test item and tested, results summarized in Table 2.

Table 2 – Burning times and rates of test item mixtures

Test item [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
10	Test item mixture smouldered for a few seconds	--
20	Test item mixture smouldered for a few seconds	--
30	Test item mixture smouldered for a few seconds	--
60	Test item mixture smouldered shortly, but extinguished nearly immediately	--
90	Test item mixture could not be ignited	--
100	Test item mixture could not be ignited (see also Flammibility test)	--

 

Due to the fact that the mixtures of the test item with cellulose could not be ignited, three tests were performed with the mixtures with 10, 20 and 30 wt.% of test item to verify these results. In these additional tests the test item mixtures showed the same behavour.

Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture it was concluded that the test item had no oxidizing properties.

Description of key information

Non oxidizing solid (EU Method A.17.)

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture it was concluded that the test item had no oxidizing properties.

Justification for classification or non-classification

The available data on oxidising properties of the test substance do not meet the criteria for classification according to Regulation (EC) 1272/2008 and are therefore conclusive but not sufficient for classification: The maximum burning rate of the test mixture was less than that of the reference mixture in a test according to EU Method A.17