S9- Keep container in a well ventilated place
S-phrases are defined in Annex IV of EuropeanUnion Directive 67/548/EEC: safety advice concerning dangerous substances and preparations. The list was consolidated and republished in Directive 2001/59/EC, where translations into other EU languages may be found. The list was subsequently updated and republished in Directive 2006/102/EC, where translations to additional European languages were added.
These safety phrases are used internationally and not just in Europe and there is an ongoing effort towards complete international harmonization. (Note: missing S-number combinations indicate phrases that were deleted or replaced by another phrase.)