"Backing" is in the HS Code "7410"
Copper Foil (Whether Ornot Printed Or Backed With Paper, Paperboard,Plastics Or Similar Backing Mate
Other Database Pages Exist for this Phrase:
Shaping (Shaping refers to positive reinforcement is given ...)
Concrete board (Concrete board pertains to a panel made out of ...)
List of books: Backing