Sulfur (Crude, Refined, and Other — Excluding Sublimed, Precipitated, and Colloidal)

Recovered as a byproduct of petroleum refining and natural gas processing, bulk sulfur in crude or refined form is one of the most widely traded industrial minerals, serving as the primary feedstock for sulfuric acid and fertilizer manufacturing. The US schedule divides this heading into crude/unrefined sulfur (2503000010) and refined sulfur (2503000090), with the processing grade determining classification. Canada is the dominant supplier, reflecting the proximity of Alberta's oil sands operations, with the United Arab Emirates and India also significant sources. Sublimed, precipitated, and colloidal sulfur forms are explicitly excluded and classified elsewhere.