3921.13.11.00 - Over 70 percent by weight of plastics

This HTS category, 3921.13.11.00, specifically classifies cellular sheets, film, foil, and strip of polyurethanes that are combined with textile materials. The defining characteristic for inclusion here is that the polyurethane plastic component constitutes over 70 percent of the total weight of the product. These are typically composite materials where a foamed polyurethane forms the core or a significant layer, bonded to or laminated with a textile material. Examples could include specialized industrial membranes, insulation materials, or decorative paneling where the polyurethane's cellular structure and the textile's properties are leveraged.

This classification distinguishes itself from its sibling category, 3921.13.15.00 ("Other"), by its precise weight criterion for the polyurethane content. While the sibling category would encompass other polyurethane cellular products combined with textiles that do not meet the 70% plastic by weight threshold, this code is exclusively for those heavily dominated by the polyurethane. The detailed sub-classification reflects the importance of the material composition in determining the tariff treatment for these composite goods.

As this is a leaf node, there are no further subcategories. The classification is complete at this level, indicating that the primary distinguishing factor for these goods is their construction as cellular polyurethane combined with textiles where the polyurethane exceeds 70% of the total weight.