2517.10.00 - Pebbles, gravel, broken or crushed stone, of a kind commonly used for concrete aggregates, for road metalling, or for railway or other ballast, shingle and flint, whether or not heat-treated

This HTS category, 2517.10, encompasses natural mineral materials primarily used as aggregate and ballast. It includes pebbles, gravel, and broken or crushed stone that are commonly employed in the construction of concrete, road surfaces, and railway beds. Shingle and flint, regardless of whether they have undergone heat treatment, are also classified here when intended for similar aggregate purposes. This heading focuses on the raw, processed, or naturally occurring forms of these stones based on their typical applications in infrastructure development.

The primary distinction of 2517.10 from its sibling categories lies in the specific types of materials and their intended uses. Unlike 2517.20, which covers macadam derived from industrial waste, or 2517.30, which pertains to tarred macadam, 2517.10 deals with natural stones and pebbles. Furthermore, it is separate from the materials described under the parent heading that may be derived from stones of headings 2515 or 2516, focusing instead on the bulk aggregate and ballast applications.

Within this classification, further subdivisions exist to refine the scope. Subcategory 2517.10.00.15 specifically addresses pebbles and gravel, distinguishing them as distinct granular forms. Subcategory 2517.10.00.20 isolates limestone within this group, acknowledging its widespread use as aggregate. The residual category, 2517.10.00.55, "Other," serves to capture any remaining types of broken or crushed stone and shingle/flint that fit the primary description but are not specifically enumerated in the preceding subcategories.