Reaction products of 7-amino-4-hydroxynaphthalene-2-sulfonic acid reacted with 2-((1,3,5-triazin-2-yl)amino)ethan-1-ol, coupled with diazotised 3-amino-4-hydroxybenzenesulfonic acid, subsequently coupled with diazotised 2-amino-5-methoxybenzenesulfonic acid, chelated with copper, sodium salt

Auto flammability

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:

from 2017-06-09 to 2017-06-12

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.16 (Relative Self-Ignition Temperature for Solids)

Version / remarks:

2008

Deviations:

no

GLP compliance:

no

Key result

Relative self-ignition temperature:

381.2 °C

Remarks on result:

preliminary test

Temperature of the test substance exceeded oven temperature in ca 360 °C. There was sharp rise of temperature reaching the value 408 °C (corresponds to the temperature 400 °C after correction) when the temperature of the oven was 391.4 °C for the first experiment and 388.0 for the second experiment. Mean temperature after correction was 381.2 °C. Relative self-ignition temperature of the test substance is 381.2 °C.

 

Conclusions:

The relative self-ignition temperature of Direct Red 243 is determined to be 381.2 °C.

Executive summary:

An experimental study was performed according to EU Method A.16 (2008) in order to evaluate the self-ignition properties of the substance. Self-ignition occurs when the rate of heat production exceeds the rate of heat loss. The test procedure is useful as a preliminary screening test for solid substances.

A certain volume of the substance under test is placed in an oven at room temperature; the temperature/time curve relating to conditions in the centre of the sample is recorded while the temperature of the oven is increased to 400 °C, or to the melting point if lower, at a rate of 0.5 °C/min.

For the purpose of this test, the temperature of the oven at which the sample temperature reaches 400°C by self-heating is called the self-ignition temperature. The relative self-ignition temperature of Direct Red 243 is determined to be 381.2 °C.

Description of key information

The relative self-ignition temperature of Direct Red 243 is determined to be 381.2 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

381.2 °C

Additional information

An experimental study was performed according to EU Method A.16 (2008) in order to evaluate the self-ignition properties of the substance. The relative self-ignition temperature of Direct Red 243 is determined to be 381.2 °C.

Moreover, the substance is produced and regularly used for many years in Europe, transported in various conditions and in various amounts. Evidence connected to the long experience in handling, use and transport of the substance confirms the non- self-ignition properties. Thus, the substance is expected to be an air-stable compound at room temperature over a prolonged period of time (days), without noticeable or undesirable reactions. Many dyes were tested and does not show low auto-ignition temperature. The substance decomposes before melting from 252 °C and is not flammable.

In conclusion, a potential for spontaneous ignition is not expected: the substance can be considered as a no-pyrophoric and no-self-heating solid because it is not liable to self-heat by reaction with air and without energy supply. In addition, the substance is very soluble in water at room temperature and forms a stable solution with water.

No reactions with water or emission of flammable gases have ever been noted. Furthermore, for soluble dyes a reaction with water is not a desirable property from the use point of view. Therefore, the substance is considered to be not classified as a substance that in contact with water may react generating flammable gases.