3915.90.00 - Of other plastics

This HTS category, 3915.90.00, encompasses waste, parings, and scrap materials originating from plastics other than those explicitly classified under earlier subheadings. It serves as a residual category for plastic waste that does not fall into the specific classifications for polymers of ethylene, styrene, or vinyl chloride. Therefore, this heading would include discarded materials from a wide array of plastic types, such as those derived from polyurethanes, polycarbonates, acrylic polymers, or other less common plastic resins. The key differentiator is the polymer composition; if the plastic scrap is not definitively identifiable as a polymer of ethylene, styrene, or vinyl chloride, it should be considered for classification under this "other" category.

The subcategories within 3915.90.00 further refine the classification of these "other" plastic wastes. Specifically, 3915.90.00.10 is designated for waste, parings, and scrap of polyethylene terephthalate (PET) plastics. This dedicated subheading acknowledges the significant volume and distinct characteristics of PET waste. All remaining types of plastic waste, not covered by the specific subheadings for ethylene, styrene, vinyl chloride, or PET, are then directed to the residual subheading 3915.90.00.90, titled "Other." This hierarchical structure ensures that the majority of plastic waste streams are appropriately categorized, facilitating accurate trade statistics and customs processing.