Trisodium bis[4-amino-3-[(2-hydroxy-3,5-dinitrophenyl)azo]naphthalene-1-sulphonato(3-)]chromate(3-)

Auto flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Test procedure according to UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria

Qualifier:

according to guideline

Guideline:

other: UN Manual of Tests and Criteria, Part III, N.4

Version / remarks:

Rev. 6 (2015)

Key result

Relative self-ignition temperature:

> 140 °C

the weighed mass of the test item was 658.1 g.

The temperature in the centres of the 100 mm cube sample howed no temperature increase of > 60 °C within 24 hours.

(temperature profile see Figure 4 attached)

Conclusions:

neither spontaneous ignition nor self-heating exceeding the oven temperature of 140°C was observed. Therefore, the substance has not to be classified as self-heating according to Regulation (EC) No 1272/2008, annex I, 2.11.

Reference 2

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Remarks:

VDI 2263, part 1

Qualifier:

according to guideline

Guideline:

other: Directive VDI 2263, Part 1

Relative self-ignition temperature:

>= 170 °C

Remarks on result:

other: result refers to the onset temperature of the pure test substance

Relative self-ignition temperature:

>= 150 °C

Remarks on result:

other: result refers to the onset temperature of the test substance/Kieselguhr mixture (1:1)

In the investigation of self-ignition in the Grewer oven for the pure test item an exothermic effect was observed starting at an onset temperature of 170 °C that led to a maximum temperature of approx. 420 °C. After the test the wire-basket with pure test item was almost empty.

For the test item in mixture with Kieselguhr a slight exothermic effect was observed at an onset temperature of 150° and the temperature increased to approx. 410 °C.

temperature over time and temperature increase rate over reference substance figures are attached.

Conclusions:

Due to the results from the Grewer-Oven screening test further studies are necessary to exclude or classify the substance as self-heating substance according to Regulation (EC) No 1272/2008.

Additional information

The self-heating in air was studied in a screening test according to Grewer (Grewer-Oven-Test, VDI 2263-1) with the pure test substance and additionally with a 1:1 kieselguhr mixture.

In this test with the pure product an exothermal effect was recorded starting at 170 °C that led to a maximum temperature of 420 °C. With the kieselgur mixture (1:1) an exothermal effect was detected starting at 150 °C which led to a maximum temperature of 410 °C.

Due to these results from the Grewer-Oven Test an UN N.4 test (Bowes-Cameron-Cage Test) according to the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, was performed in order to exclude or classify the substance as self-heating substance according to Regulation (EC) No 1272/2008.

In this higher tier study the test item was placed in a cube-form sample container of stainless steel. wire netting (edge length 10 cm, defined mesh size: 0.05 mm) with their top surface open. The oven temperature was adjusted to the test temperature of 140°C.

After approximately 7 hours the test item reached the oven temperature of 140°C. Neither spontaneous ignition nor self-heating exceeding the oven temperature of 140°C was observed within 24 hours.

Therefore, the substance has not to be classified as self-heating according to Regulation (EC) No 1272/2008.