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Auto flammability

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relative self-ignition temperature (solids)
Type of information:
other: Expert Judgement
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Data derived form expert Judgement
Principles of method if other than guideline:
Expert judgement
GLP compliance:
Remarks on result:
other: Expert Judgement

Expert Judgement

Not autoflammable
Executive summary:

Not autoflammable

Description of key information


Key value for chemical safety assessment

Additional information

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 244 °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

Moreover, an existing study on a similar substance was considered as supporting information:

The determination of the auto-ignition temperature has been conducted in accordance with the EEC Directive Annex V of 67/548 Test A 15 auto-ignition temperature for liquids.

The temperature of the oven and the sample were continuously recorded while the temperature of the oven was increased to approximately 550 °C at a rate of about 3- 5 °C/min. Then the test item is given drop by drop with pipette by cylinder hole into Erlenmeyer flask.

Whether the heat development is due to a reaction of the test item with oxygen or due to exothermic decomposition is not relevant for the test. Self heating, with the possible consequence of self-ignition, occurs, when the rate of heat production exceeds the rate of heat loss to the surroundings.

The test substance did not show auto-ignition until 550 °C.

The evaluation of the similarity between the target substance and the Similar Substance 01 is attached at section 13.