Tariff Concession Order 0903184 declares a specific refractory mortar (customs heading 3816.00.00) eligible for the Schedule 4, Item 50 concession under s.269P of the Customs Act 1901, effective 30 Jan 2009 until revoked. The order specifies chemical composition limits (Al2O3, SiC, SiO2) that imported goods must meet.
Importers matching that description receive the Schedule 4 tariff treatment (changes to duty exposure). The decision is made by a CEO delegate under s.269P; compliance requires import paperwork and product verification and revocation would restore prior duty outcomes.