Goods classification rules for plastics and rubber sets hinge on joint use, complementary constituents, and printing that affects chapter placement.

Goods put up in sets of two or more separate constituents intended to be mixed together to obtain a product are classified in the heading appropriate to that product where they are clearly identifiable for joint use, presented together, and complementary to one another. Except for headings 3918 and 3919, plastics, rubber, and articles thereof printed with motifs, characters, or pictorial representations that are not merely subsidiary to the primary use of the goods fall in Chapter 49.

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