3921.90.21.00 - Products with textile components in which cotton predominates by weight over any other single textile fiber

This HTS classification, 3921.90.21.00, specifically covers composite articles made from plastics that are combined with textile materials. The defining characteristic of products within this category is that the textile component must consist predominantly of cotton by weight, meaning cotton is present in a greater proportion than any other single textile fiber. These products are distinct from other plates, sheets, film, foil, and strip of plastics that are combined with textile materials based on the specific fiber composition of the textile element.

Distinguishing this category from its siblings is crucial for accurate classification. While both 3921.90.21.00 and 3921.90.25.00 fall under the broader heading of plastic sheeting combined with textiles weighing more than 1.492 kg/m², their divergence lies in the dominant textile fiber. Category 3921.90.21.00 applies when cotton is the predominant fiber. In contrast, 3921.90.25.00 is for products where man-made fibers (such as polyester, nylon, or rayon) are the predominant fiber by weight. Category 3921.90.29.00, as "Other," serves as a residual category for plastic sheeting combined with textiles that do not fit the specific fiber predominance criteria of the other subheadings.

As this is a leaf node in the HTS database, there are no further subcategories to introduce. Therefore, classification within 3921.90.21.00 relies solely on meeting the criteria of being a plastic plate, sheet, film, foil, or strip combined with textile materials, where the overall weight per square meter exceeds 1.492 kg, and critically, where cotton constitutes the single heaviest textile fiber. Examples might include certain types of coated fabrics or reinforced sheeting where cotton is the primary fiber in the reinforcing textile layer.