Special Additional Duty exemption for listed agricultural and industrial imports, with a residual ad valorem duty for all others. Specifies a schedule of imports that attract a nil rate of Special Additional Duty when falling within identified Chapters, headings or sub-headings of the First Schedule to the Customs Tariff Act, subject where applicable to conditions or cross-referenced notifications and annexures; items not listed are subject to the residual ad valorem Special Additional Duty. The instrument defines certain items (e.g., prawn feed) by use and standard input-output norms and links exemption terms to existing customs exemptions in the First Schedule and other notifications.