This Order applies a specific tariff concession (Part III, Schedule 4 item 50 of the Customs Tariff Act 1995) to imports classified as 2914.40.10 (diacetone alcohol), effective 21 October 2005. A delegate of the Chief Executive Officer declared the change under section 269P of the Customs Act 1901. The practical effect is an administrative tariff rule that affects importers of diacetone alcohol (who may pay a concessionary tariff rate) and is enforceable until revoked under sections 269SC or 269SD.