Diammonium 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:

2016-06-10 to 2016-06-16

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

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 66, 66 and 67 s.

Sample tested:

reference mixture as specified

Remarks:

barium nitrate and cellulose with different wt. % oxidizer

Parameter:

burning rate

Result:

1.98 mm/s

Remarks on result:

other: result found for mixture with 60 wt. % oxidizer

Sample tested:

test mixture as specified

Remarks:

cellulose and 10 wt. % test item

Parameter:

maximum burning rate

Result:

0.39 mm/s

Remarks on result:

other:

Remarks:

result is lower than maximum burning rate of reference mixture

Results
Preliminary test
The test mixtures with cellulose only burned for 20 s at the ignition point, the flame extinguished without any spreading. No complete burning of the test mixture was seen.

Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 66, 66 and 67 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).

Table 1 – Burning times and rates of reference mixtures

Barium nitrate [wt. %]	Burning time over 200 mm [s]	Burning rate [mm/s]
50	133	1.50
55	118	1.69
60	101	1.98
70	157	1.27

 

The highest burning rate of 1.98 mm/s was found for the mixture with 60 wt. % oxidizer.

Mixtures of the test item with cellulose were prepared with different wt. % of the test item and tested.

Table 2 – Burning times and rates of test item mixtures

Test item [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
10	Mixture extinguished after 281 s and 11 cm	(0.39)
20	Mixture extinguished during the initial burning  distance	--
30	Mixture extinguished during the initial burning  distance	--
60	Mixture showed only local charring in contact with the ignition flame	--
90	Mixture showed only local charring in contact with the ignition flame	--

 

As the maximum burning rate of the test item and cellulose mixtures is lower than the maximum burning rate of the reference mixture, six tests were done only with the three mixtures with the highest burning rates to verify these values (Table 3).

Table 3 – Burning times and rates of fastest test item mixtures

 

Test	t [s]	V [mm/s]	t [s]	V [mm/s]	t [s]	V [mm/s]	t [s]	V [mm/s]	t [s]	V [mm/s]	t [s]	V [mm/s]
10%^1	135	0.41	127	0.41	141	0.38	138	0.36	138	0.41	125	0.38
20%	Mixture extinguished during the initial burning  distance
30%	Mixture extinguished during the initial burning  distance

1)   The mixtures all extinguished after 48 -  56 mm (the burning rate was calculated with these values).

Each mixture was measured 6 times. The mean burning rate for the mixture with the highest burning rate (10 %) was 0.39 mm/s. The difference between between the mean burning rate and the maximum burning rate was 10 % for this mixture.

The maximum burning rate of the mixtures of the test item and cellulose (0.41 mm/s) was lower than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.98 mm/s).

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 has 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

The maximum burning rate of the mixtures of the test item and cellulose (0.41 mm/s) was lower than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.98 mm/s)

Justification for classification or non-classification

The available data on oxidizing 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 (barium nitrate and cellulose 2:1) in a test according to the EU method A.17.