3501.10.50.00 - Other

This HTS category, 3501.10.50.00, encompasses casein that does not fall under the specific classification of "Milk protein concentrate" (3501.10.10.00). Casein itself is the primary protein found in milk, and this heading covers various forms of crude or denatured casein not otherwise specified. These can include, for example, acid casein, rennet casein, or casein precipitates obtained through various industrial processes.

The distinction from the sibling category, "Milk protein concentrate," is crucial. Milk protein concentrate is a more refined product, typically characterized by a higher percentage of milk protein, often produced through ultrafiltration or other concentration methods. This subcategory, however, captures the raw or less processed forms of casein where the primary protein component is casein, but it may contain a broader spectrum of milk solids or have undergone different processing treatments.

As this is a terminal node in the HTS structure, there are no further subcategories to introduce. The classification therefore rests on identifying goods as casein-based and ensuring they do not meet the specific criteria for milk protein concentrates. Practical classification will rely on analyzing the production process, protein content, and the intended use of the material to determine if it fits within the "Other" designation for casein.