3403.91 - Preparations for the treatment of textile materials, leather, furskins or other materials:

This HTS subheading, 3403.91, encompasses preparations specifically designed for treating textile materials, leather, furskins, or other materials. These preparations are distinct from general lubricating preparations, focusing on enhancing the properties or facilitating the processing of these specific substrates. The key differentiator from other subheadings under 3403.9 is their direct application to materials like fabrics, hides, or pelts, rather than being general-purpose lubricants or rust inhibitors.

The classification under 3403.91 signifies that these are not primary lubricants based on petroleum oils or oils from bituminous minerals, but rather specialized formulations. They are intended to impart qualities such as softness, water repellency, stain resistance, or to prepare these materials for further manufacturing processes, such as dyeing or finishing. The purpose is to modify the surface or bulk characteristics of the textile, leather, or fur.

Within this category, further subdivision occurs to differentiate the specific intended use. Subheading 3403.91.10.00 addresses preparations directly formulated for the treatment of textile materials, such as fabric softeners or waterproofing agents. The remaining preparations for other materials, or those not specifically for textiles, fall under 3403.91.50.00. This bifurcation allows for more precise identification based on the primary material being treated by the preparation.