3921.12 - Of polymers of vinyl chloride:

This HTS category, 3921.12, specifically addresses cellular plates, sheets, film, foil, and strip that are manufactured from polymers of vinyl chloride. This includes a wide array of materials, commonly known as vinyl foam or cellular PVC, which possess a characteristic cellular or foamed structure within the solid plastic. These products find applications across various industries due to their lightweight, insulating, and shock-absorbing properties.

Distinguishing this category from its siblings is crucial for accurate classification. While all share the broader heading of "Other plates, sheets, film, foil and strip, of plastics," 3921.12 is exclusively for those derived from vinyl chloride polymers. For instance, sibling category 3921.11 covers similar cellular products made from styrene polymers, and 3921.13 pertains to those made from polyurethanes. Category 3921.14 focuses on cellular regenerated cellulose, and 3921.19 encompasses cellular materials made from any other plastic not otherwise specified. The key differentiator here is the primary polymer used in the manufacturing process.

Within the 3921.12 classification, further subdivisions exist to refine the classification based on additional characteristics. The subcategory ": Combined with textile materials:" accounts for cellular vinyl chloride products that have been integrated with textiles, creating composite materials with enhanced functionalities. The remaining entries, such as "3921.12.50.00: Other," are designated for cellular vinyl chloride products that do not fall into the combined textile material category, covering a broad range of unadulterated cellular vinyl sheets, films, and the like.