Disodium [6-[(2-anilino-1-naphthyl)azo]-2,4-dinitrophenolato(2-)][3-hydroxy-4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulphonato(3-)]chromate(2-)

Oxidising properties

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

March 26th, 1987

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

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

GLP compliance:

not specified

Specific details on test material used for the study:

After drying for 48 hours at 45 °C and 130 hPa a reduction in mass of 3 % was observed.

Contact with:

powdered cellulose

Sample tested:

other: 2:1 sample-to-cellulose ratio

Parameter:

preliminary test

Remarks on result:

other: mixture burned much slower than the reference substance/cellulose mixture

Test item mixture burns only in the area of the ignition wire. The flame expires after about 1 min. even if the ignition wire is kept in operation.

Since the mixture burned much slower than the reference substance cellulose mixture, it can be concluded that the test substance is not an oxidizer.

REFERENCE SUBSTANCE

The burning time in seconds of the cone shaped file was as follows: 1st test 135 sec; 2nd test 108 sec; 3rd test 124 sec.

The mixture burned down crackling with a yellow-green flame of about 5 cm of height.

Interpretation of results:

other: not classified, according to the CLP Regulation (EC) No 1272/1008

Conclusions:

Non-oxidising agent

Executive summary:

The determination of oxidising properties was carried out according to Directive 84/449/EEC, Part A Methods for the Determination of Physico-Chemical Propenties, A.17. oxidizing properties, preliminary test.

Since the mixture burned much slower than the refenence substance cellulose mixture, it can be concluded that test substance is not an oxidizer.

Conclusion

Non-oxidising agent.

Reference 2

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

July from 25th to 27th, 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2015

GLP compliance:

no

Contact with:

powdered cellulose

Duration of test (contact time):

3 min

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

> 180 s

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

> 180 s

Sample tested:

reference: 3:7 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

115.4 s

RESIDUAL MOISTURE

The test item contained a residual moisture of <0.1 wt. %, which was determined by drying the test item at 50 °C under vacuum.

The reference item Potassium Bromate contained a residual moisture of <0.1 wt. %, which was determined by drying the reference item at 65 °C.

The reagent Cellulose contained a residual moisture of 6.3 wt.-%, which was determined by drying the reagent at 105 °C.

Burning times of the mixtures of the test item and cellulose

Test item – Cellulose	Test 1 / s	Test 2 / s	Test 3 / s	Test 4 / s	Test 5 / s	Average / s
4:1	>180	>180	>180	>180	>180	>180
1:1	>180	>180	>180	>180	>180	>180

REFERENCE MIXTURE

Burning times of the reference mixtures of potassium bromate and cellulose

Potassium bromate – Cellulose	Test 1 / s	Test 2 / s	Test 3 / s	Test 4 / s	Test 5 /s	Average / s
3:7	113	112	121	123	108	115.4

The tests with the mixture potassium bromate:cellulose 2:3 and 3:2 were not performed, because the burning time of the mixtures of test item with cellulose was higher than the burning time of the reference mixtures 3:7.

Interpretation of results:

other: not classified, according to the CLP Regulation (EC) No 1272/1008

Conclusions:

Non-oxidising agent

Executive summary:

The determination of oxidising properties was carried out acconding to Recommendations on the Transport of dangerous goods: Manual of Tests and Criteria, 6th edition, New York and Geneva, 2015: Part III, Division 5.1, Section 34, Test O.1.

Mixture of the reference item and Cellulose were prepared in the potassium bromate to Cellulose ratio of 3:7 and mixture of the test item and Cellulose were prepared in the test item to Cellulose ratio of 4:1 and 1:1. Using the conical funnel, the mixture was formed into a truncated conical pile, with a base diameter of 70 mm, covering the looped ignition wire resting on the low heat conducting plate. The plate was placed in a ventilated area and the test performed at atmospheric pressure with the ambient temperature 20 ± 5 °C.

Power was applied to the ignition wire and was maintained for the duration of test or for 3 min if the mixture did not ignite and burn. The recorded burning time was taken from when the power was switched on to when the main reaction ended. The test was performed five times on test item.

The burning time of mixtures of test item with cellulose (4:1 and 1:1) was higher than the burning time of reference mixture of potassium bromate and cellulose (3:7). Due to tests results, test item does not have to be classified as oxidizing solid.

Conclusion

Non-oxidising agent.

Description of key information

non oxidising

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

UN Test O.1 and EU Method A.17

Justification for classification or non-classification

According to the CLP Regulation (EC) No 1272/2008, oxidizing solid means a solid substance or mixture which, while in itself is not necessarily combustible, may, generally by yielding oxygen, cause, or contribute to, the combustion of other material.

Since the burning time of the mixtures of the test item with cellulose (4:1 and 1:1) was higher than the burning time of the reference mixture of potassium bromate and cellulose (3:7), it was concluded that the test substance does not meet the criteria to be classified as oxidising solid, according to the CLP Regulation (EC) No 1272/2008.