Heading 8474.80 specifically covers machines that form molds from sand for foundry use — the process of compacting or shooting sand around a pattern to create a casting cavity. This is distinct from plastic injection molding machines (heading 8477), die-casting machines (heading 8454), and ceramic kilns or presses (which may fall under 8479 or 8474.80 depending on function). The key identifier is the use of sand as the mold-forming medium in a metal-casting context.

If the machine's principal function is agglomerating or shaping mineral substances (including ceramic paste, mineral fuels, or refractory materials), 8474.80 is the appropriate heading. Machines that primarily perform a pressing or compacting function on non-mineral materials — such as metal powder compaction presses — are more likely classified under heading 8462 or 8479. Importers should document the specific material processed and the machine's design intent, as CBP will look to the principal-use criterion when the function could span multiple headings.