… by heat in vacuum or in inert gas or otherwise chemically modified, excluding those of heading 15.16; inedible …
Explanatory notes
… by heat in vacuum or in inert gas or otherwise chemically modified, excluding those of heading 15.16; inedible … fractions which have been subjected to processes which modify their chemical structure thereby improving their … when exposed to the air and forming elastic films) or modifying their other properties, provided they retain their …