Pebbles, Gravel & Crushed Stone for Concrete Aggregates, Road Metalling & Ballast

Aggregate materials classified here — pebbles, gravel, broken or crushed stone, shingle, and flint — serve as foundational inputs for the construction, infrastructure, and rail industries, whether used in concrete mixes, road base, or railway ballast. The US schedule distinguishes pebbles and gravel (2517100015), limestone other than pebbles and gravel (2517100020), and other crushed or broken stone (2517100055), making accurate material identification critical at entry. Canada and the Bahamas are the leading suppliers, with Mexico, Turkey, and Spain also contributing. Heat treatment does not change classification within this heading, but it may affect admissibility documentation.