Registration Dossier
Registration Dossier
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EC number: 244-214-4 | CAS number: 21109-95-5
Flammability
Administrative data
Link to relevant study record(s)
Description of key information
Highly flammable solid (A10/UN N.1): no highly flammable solid
In contact with water substance liberates highly flammable gases (A12): BaS does not liberated highly flammable gases in the sense of the test guideline
Pyrophoric substance (A13/UN N.2): no pyrophoric properties
Key value for chemical safety assessment
- Flammability:
- non flammable
Additional information
Flammability:
The test item barium sulfide is not a highly flammable solid in the sense of the European Commission Regulation (EC) No.440/2008, Method A.10/UN test N.1 and it is not a flammable solid in the sense of the classification criteria as laid down in Regulation (EC) No. 1272/2008 (CLP Regulation).
Pyrophoric properties:
Barium sulfide has no pyrophoric properties in the sense of European Commission Regulation (EC) No.440/2008, Method A.13.
Flammability in contact with water:
The readily water-soluble compound barium sulfide (73.5 g/L at 20°C) will initially dissociate upon dissolution inwater and/or relevant physiological media into sulfide and barium ions. Sulfide (S2-), hydrogen sulfide (sulfhydryl) anions (HS-) and hydrogen sulfide (H2S), respectively, coexist in aqueous solution in a dynamic pH-dependant equilibrium. Sulfide prevails only under very basic conditions (only at pH > 12.9), hydrogen sulfide anions are most abundant at pH 7.0 – 12.9, whereas at any pH < 7.0, hydrogen sulfide (aq) is predominant.
Hydrogen sulfide is known to a highly flammable (Index no.: 016-001-00-4) gas. However, the development of highly flammable gases of hydrogen sulfide (≥ 1L/kg per h) is impossible, since the pH value of a saturated solution is 13.7. According to the above; at pH 13.7, S2-(~90 %) and HS-(~10 %) are present in solution. Hence, barium sulfide could be regarded as non-flammable in contact with water and must not be classified as such according to Regulation (EC) 1907/2006 Annex VII column 2) "flammability".
Justification for classification or non-classification
Barium sulfide does not need to be classified for flammability according to Directive 67/548 EEC and CLP Regulation (EC) No 1272/2008 based on testing results.
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