Sodium 6-amino-5-[[2-[(ethylphenylamino)sulphonyl]phenyl]azo]-4-hydroxynaphthalene-2-sulphonate

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Link to relevant study record(s)

Reference

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

February 22nd, 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:

other: VDI 2263, sheet 1, Grewer Oven Test

Version / remarks:

1990

GLP compliance:

no

Remarks on result:

no self ignition observed under the test conditions

In the investigation of self-ignition in the Grewer Oven the pure test item showed an exothermic effect starting at a temperature of 245 °C, which led to a maximum temperature of approx. 280 °C (5 K above the corresponding temperature of the reference material). After the test, a black residue was left inside the wire basket.

For the test item in mixture with Kieselguhr, an exothermic process was detected starting at a temperature of approx. 230 °C, which led to a maximum temperature of approx. 295 °C (corresponding oven temperature 275 °C). After this, the temperature of mixture was permanent over the temperature of the reference material and led to a maximum temperature of approx. 570 °C (corresponding oven temperature 400 °C).

Experiment	Onset self-ignition / °C	Maximum temperature / °C
Pure test item	245	280
Test item in mixture with Kieselguhr (1:1)	230	295 1^stPeak
		570 2^ndPeak

Conclusions:

No self-ignition

Executive summary:

The self-ignition behavior of the test item was determined in the oven according to VDI 2263, sheet 1. The test item was filled in a small wire basket and placed into the oven; an additional basket was filled with a reference material (graphite). The temperature of the oven was increased with a constant heating rate (1.2 K/min) in an air stream of 100 to 120 l per hour and the temperature of the sample was recorded as a function of time at intervals of 10 seconds.

Due to the fact that very often the test item melts before a self-ignition takes place, the self-ignition behavior of the sample blended with 50 wt.-% Kieselguhr was investigated in a third wire basket simultaneously.

The pure test item indicated a self-heating at atmospheric pressure starting at a temperature of 245 °C, which led to a maximum temperature of 280 °C.

According to the result of the test on the self-ignition in the Grewer Oven, test item has not to be classified as self-heating substance in class 4, division 4.2 according to the UN Transport Regulation.

Conclusion

No self-ignition.

Description of key information

No self-ignition

Additional information

Grewer Oven Test - VDI 2263, sheet