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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties


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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

non flammable

Additional information


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.