This Tariff Concession Order (TCO 0516028) declares that, from 15 November 2005, certain refractory insulating boards meeting tight technical criteria (service temperature ≥950°C; specified composition; porosity 40–60%; flexural strength ≥10 MPa) are goods to which Item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995 applies (s.269P). Mechanically, it changes the tariff treatment for importers of those specific products; the declaration was made by a delegate of the CEO and remains in force until revoked under ss.269SC–269SD or a specified end date.