3921.19.00 - Of other plastics

HTS code 3921.19.00 encompasses cellular plates, sheets, film, foil, and strip made from plastics other than those specified in preceding subheadings. This category acts as a residual for foamed plastic materials within the broader heading 3921, which covers other plates, sheets, film, foil, and strip of plastics. The key defining characteristic here is the cellular structure (foamed or porous) and the plastic material not being a polymer of styrene, vinyl chloride, or polyurethane, nor regenerated cellulose.

Distinct from its siblings, 3921.19.00 is differentiated by the specific plastic composition. It excludes cellular products made from polystyrene (3921.11), vinyl chloride polymers (3921.12), polyurethanes (3921.13), and regenerated cellulose (3921.14). Therefore, if a cellular plastic sheet is composed of polyethylene, polypropylene, or any other plastic not explicitly listed in the preceding sibling categories, it would fall under this residual classification.

This category is further subdivided to provide more granular control over specific types of cellular plastic materials. Subcategory 3921.19.00.10 specifically addresses microporous sheets of polyethylene or polypropylene film, recognizing their unique properties and applications. The residual subheading 3921.19.00.90 captures all other cellular plates, sheets, film, foil, and strip of plastics that do not meet the criteria for the more specific subcategories.