3403.91.10.00 - Preparations for the treatment of textile materials

This HTS classification, 3403.91.10.00, specifically designates preparations designed for the treatment of textile materials. These preparations are applied to fabrics and yarns to impart desired properties such as water repellency, flame resistance, softness, or to facilitate further processing like dyeing and finishing. The key characteristic is their intended use in modifying the surface or bulk characteristics of textiles.

This category is distinguished from its sibling, 3403.91.50.00 ("Other"), by its exclusive focus on textile applications. While the parent heading encompasses a broader range of lubricating and treatment preparations for various materials (including leather and furskins), this specific subcategory narrows the scope to exclusively those preparations formulated and marketed for textile use. Therefore, if a preparation is intended for treating leather, it would fall under the "Other" sibling category, even if it shares similar chemical bases.

As this is a leaf node in the HTS structure, there are no further subcategories. Classification under 3403.91.10.00 is final for preparations meeting the criteria of being designed for textile material treatment and not falling under other more specific headings within Chapter 34. This implies that the primary determinant for classification here is the intended end-use and application on textile substrates, rather than solely the chemical composition.