Raw silk (5002) covers reeled filament that has not been thrown — meaning it has not been twisted, doubled, or plied into yarn. Once the filament undergoes throwing to produce silk yarn, it is classified under heading 5004 (if not spun from waste) or 5005 (if spun from waste), depending on the fiber source.

No. Heading 5002 covers raw silk whether or not it has been degummed (sericin removed), provided it has not been thrown. Degumming is a preparatory process that does not change the classification as long as the filament remains in its reeled, untwisted state.