3916.90 - Of other plastics:

This HTS category, 3916.90, encompasses monofilaments, rods, sticks, and profile shapes made from plastics, excluding those derived from polymers of ethylene or vinyl chloride. The defining characteristic is the material composition, where the plastic is not specifically of ethylene or vinyl chloride origins. These items are considered "worked" only to the extent of surface treatment or if they are not otherwise processed beyond their basic extruded or molded form.

Distinguishing this category from its siblings is crucial for accurate classification. HTS 3916.10.00.00 specifically covers such articles made from polymers of ethylene, while HTS 3916.20.00 addresses those made from polymers of vinyl chloride. Therefore, 3916.90 serves as a residual category for plastic extrusions and profiles not falling under those two major polymer groups.

The subcategories under 3916.90 further refine the classification based on the specific type of plastic. For instance, 3916.90.10.00 captures articles made of acrylic polymers. The subsequent "Other" designation within this group indicates a residual subcategory for any other plastic materials not specifically enumerated, requiring detailed analysis of the plastic's chemical composition for correct placement.