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Physical & Chemical properties

Auto flammability

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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Since starting of production and use
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Brazing flux is stable in contact with air at room temperature for prolonged periods of time and does not react with water as showed by its production process that occurs with water. Additionally, the handling of the substance for brazing is done at elevated temperature (up to 970 °C), clarifying that brazing flux is not auto-flammable and that additional testing is not necessary.



Qualifier:
equivalent or similar to
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
Version / remarks:
Regular practice of brazing at elevated temperature (up to 970 °C).
Deviations:
yes
Remarks:
Temperature increase rises higher than 400°C /MP
GLP compliance:
no
Specific details on test material used for the study:
Substance specific as produced and used by the registrant.
Key result
Relative self-ignition temperature:
> 970 °C
Remarks on result:
no self ignition observed under the test conditions
Remarks:
no self ignition seen under use conditions (up to 970°C)
Conclusions:
Brazing flux does not show property of auto flammability up to 970°C.
Moreover, this evidence is for a temperature larger higher than that given in the REACH Annex VII, Col 2, where the Regulation provides the following specific rule to support non-testing: "for solids (...) or i preliminary results exclude self-heating of the substance up to 400°C".

Description of key information

The substance is used as a brazing flux and hence exposed to high temperatures. It does not show (auto)flammable properties under these conditions and therefore it was concluded that testing of auto flammability is not required. 

Key value for chemical safety assessment

Additional information