Platinum sponge, ingot, and cast forms are all considered unwrought and fall within this heading alongside powder. The common thread is that none of these forms has been mechanically worked — rolled, drawn, or extruded. Sponge is a porous, chemically reduced form; powder is finely divided particulate. Both are classified here, but the specific physical form should be stated on the commercial invoice because it can affect valuation and downstream end-use documentation.

Yes. Platinum alloys in unwrought or powder form are explicitly included. Platinum-rhodium alloys used in glass-fiber bushings and platinum-iridium alloys used in laboratory standards are common examples. The alloy composition should be declared on entry documents, as rhodium and iridium are separately tracked PGMs with their own supply-chain considerations.