5603.94.10 - Floor covering underlays

This HTS category, 5603.94.10, specifically covers "Floor covering underlays" that are classified as nonwovens. These materials are characterized by their construction from textile fibers, bonded together by mechanical, chemical, or thermal means, and are designed to be placed beneath floor coverings like carpets or rugs. The key distinguishing features for this classification are that these nonwovens are not made into specific articles like fabrics but are intended for use as an intermediate layer to enhance comfort, insulation, or stability of the final floor covering installation.

Within the broader classification of "Other" nonwovens weighing more than 150 g/m², this specific heading isolates those designed explicitly for underlay purposes. This differentiates them from other nonwoven materials of a similar weight that might be used for different applications, such as industrial filters, disposable hygiene products, or protective clothing. The emphasis here is on the intended *function* as a floor covering underlay, regardless of the specific manufacturing process or constituent fibers beyond the general "nonwoven" definition.

The subcategories at the next level, 5603.94.10.10 and 5603.94.10.90, further refine this classification based on the material composition of the underlay. Subcategory .10.10 accounts for underlays made from wool or fine animal hair, recognizing the specific properties and potential trade implications of these natural fibers. The residual category, .10.90, encompasses all other underlays that do not fall under the wool or fine animal hair specification, ensuring a comprehensive classification for all types of nonwoven floor covering underlays within this weight bracket.