2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methylbenzothiazolium methyl sulphate

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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:

September 20 to November 21, 2003

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods with acceptable restrictions

Qualifier:

according to guideline

Guideline:

other: Guideline VDI 2263, sheet 1 (Grewer-oven)

Deviations:

no

GLP compliance:

no

Key result

Relative self-ignition temperature:

> 110 °C

Conclusions:

The test substance showed an exothermal reaction beginning at 110 °C in air stream.

Executive summary:

The self-ignition temperature of the test item was investigated according to the guideline VDI 2263, sheet 1 (Grewer-Oven in air stream). The test substance showed an exothermal reaction beginning at 110 °C in air stream.

Description of key information

The self-ignition temperature of the test item was investigated according to the guideline VDI 2263, sheet 1 (Grewer-Oven, air stream). The test substance showed an exothermal reaction beginning at 110 °C.

However, the information from melting/boiling point testing clearly indicates, that the test substance starts to melt at 90 °C (see IUCLID section 4.2). It is completely molten and discoloured to black at 123 °C (capillary method).

In line with the ECHA Guidance R.7a (December 2016), the terminology of REACH in relation to endpoint 7.12 "Self-ignition temperature" is not very precise. For solids and liquids the term "self-heating" should be used. In general, self-heating occurs only for solids in contact with air (reaction with oxygen with subsequent ignition; see chapter R.7.1.10.7).

In accordance with the ECHA Guidance on the Application of CLP criteria, section 2.11, self-heating substances (and mixtures) are classified in two categories. However, substances with a melting point below 160 °C should not be considered for classification in this class, if the substance is completely molten up to this temperature. This is due to the fact that melting is an endothermic process which drastically reduces the substance-air surface.

Thus, it can be concluded that the test substance should not be considered for classification as self-heating substance, as it is completely molten (and decomposed) at 123 °C.

This information is used in a read-across approach in the assessment of the target substance.

For justification of read-across please refer to the attached read-across report (see IUCLID section 13).