Hydroxylammonium chloride

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

21 Apr - 28 Apr 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

no

Specific details on test material used for the study:

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

Contact with:

powdered cellulose

Sample tested:

test mixture as specified

Remarks:

test item/cellulose 2:1

Parameter:

preliminary test

Remarks on result:

other: burned down completely in 180, 157 and 143 s

Sample tested:

test mixture as specified

Remarks:

barium nitrate/cellulose 2:1

Parameter:

preliminary test

Remarks on result:

other: burned down completely in 62, 60 and 56 s

Sample tested:

reference mixture as specified

Remarks:

barium nitrate and cellulose with different wt. % oxidizer

Parameter:

maximum burning rate

Result:

2.04 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:

0.6 mm/s

Remarks on result:

other: burning time was 336 s/result is lower than maximum burning rate of reference mixture

Results
Preliminary test
Three test mixtures of test item and cellulose 2:1 burned down completely in 180, 157 and 143 s, respectively.

Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 62, 60 and 56 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	129	1.55
55	108	1.85
60	98	2.04
70	153	1.31

 

The highest burning rate of 2.04 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	528	0.38
20	Flame extinguished after 16 s, no propagation	-
30	Flame extinguished immediately	-
60	Test item mixture could not be ignited	-
90	Test item mixture could not be ignited	-
100	Test item mixture could not be ignited (see 4.13 -1, endpoint 4.13 Flammabilty)	-

 

Because a burning rate could only be determined for the mixture with 10 wt.% test item, six tests were done using only this mixture in order to verify the value (Table 3). For mixtures (20 and 30 wt.%) which could be ignited but showed no flame propagation, the test was repeated once to verify the results.

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%	528	0.38	414	0.48	386	0.52	336	0.60	395	0.51	337	0.59
20%	Flame extinguished in pre-burning phase, no flame propagation
30%	Test item mixture could not be ignited or flame extinguished immediately

 

Each mixture with 10 wt.% test item was measured six times, the mean burning rate for this mixture was 0.51 mm/s. The difference between the mean burning rate and the maximum burning rate was > 10% for this mixture. This deviation does not influence the final result because the maximum burning rate of the test item and cellulose mixtures (0.60 mm/s) was much lower than that of the reference mixture of cellulose and barium nitrate (2.04 mm/s).

Therefore, 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 test item and cellulose mixture was lower (0.60 mm/s) than that of the reference mixture of barium nitrate and cellulose 2:1 (2.04 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.