0506 - Bones and horn-cores, unworked, defatted, simply prepared (but not cut to shape), treated with acid or degelatinized; powder and waste of these products:

HTS Code 0506 encompasses a range of raw or simply processed animal by-products derived from bones and horn-cores. This category specifically includes materials that are unworked, meaning they have not been shaped or significantly modified. Defatting, simple preparation, treatment with acid to remove mineral content (degelatinization), or the production of powders and waste from these materials are all covered under this heading. The key characteristic is that the material remains in a basic, unformed state, unsuitable for direct use without further manufacturing.

Distinguishing HTS 0506 from its siblings in Chapter 05 is crucial. While other headings in Chapter 05 might cover finished products derived from animal materials (e.g., animal foodstuffs, prepared or preserved meats), or entirely different types of animal products like hair, bristles, or feathers, 0506 focuses exclusively on the unprocessed or minimally processed forms of bones and horn-cores. This contrasts with headings in earlier chapters that cover live animals, or later chapters that deal with manufactured goods.

Within HTS 0506, two primary subcategories exist to differentiate the form and treatment of the bones and horn-cores. Subheading 0506.10.00.00 specifically addresses "Ossein and bones treated with acid," which are typically used in the manufacture of gelatin. The broader subheading, 0506.90.00, covers all other products within the scope of 0506 that do not fall under the acid-treated ossein classification, such as unworked, defatted, or powdered bones and horn-cores for various industrial applications.