… Platinum, unwrought or in semi-manufactured forms, or in powder form. …
Explanatory notes
… metal, not tarnished at room temperature and resistant to acids except aqua regia. It can be fabricated into bars, sheets, strip, tubes, wire and other semi-manufactured forms by forging, … and petroleum industries as catalysts (e.g., in the ammonia-oxidation process for the manufacture of nitric acid or as a …