Monofilament, Rods, Sticks and Profile Shapes of Ethylene Polymers

Heading 3916 covers profiles that are 'not more than surface-worked,' meaning cutting to length, surface polishing, or minor finishing is acceptable. Once a rod or profile has been machined, drilled, threaded, or otherwise worked to create a specific functional shape or part, it typically reclassifies as a plastic article under Chapter 39 or, if it constitutes a part of a specific machine or apparatus, potentially under the relevant machinery chapter. The degree and nature of the working operation is the key classification factor.

The 1 mm cross-sectional threshold is the dividing line: monofilaments exceeding 1 mm in any cross-sectional dimension classify in Chapter 39 (plastics), while those of 1 mm or less are textile monofilaments classified in Chapter 54. This distinction is measured at the widest cross-sectional point, and importers should include dimensional specifications on commercial invoices to support the correct classification.