Silver

Auto flammability

Link to relevant study record(s)

Reference

Endpoint:

relative self-ignition temperature (solids)

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Description of key information

In accordance with section 1 of REACH Annex XI, the UN test N 4 for self-heating substances and mixtures do not need to be conducted as self-heating is not considered to be of relevance for this substance, since this would require heat to be developed either by reaction of this substance with oxygen or by exothermic decomposition and which is not lost rapidly enough to the surroundings. Silver metal is thermally stable under ambient conditions (melting point ca. 960°C, boiling point ca. 2200°C). Silver metal (powder) has also been shown to be non-flammable in direct contact with a flame (study according to method EU A.10). Therefore, and supported by long-term industrial experience, silver metal is considered to be intrinsically not combustible and can safely be assumed not to be self-heating. Furthermore, testing with other precious metals (Pd, Pt, Au) showed no signs of self-heating. In conclusion, the conduct of further experimental verification is not considered to be required.