Petroleum Gases & Gaseous Hydrocarbons in Gaseous State (NESOI)

Propane, butanes, and other non-natural gaseous hydrocarbons in their gaseous state — distinct from liquefied forms — serve industrial, refinery, and specialty chemical end uses. The US schedule subdivides this heading by specific compound and purity grade: propane below 90% liquid-volume purity (2711290015), butanes at 90–95% purity (2711290020), other butanes (2711290025), and a residual catch-all (2711290060). The Dominican Republic and Angola lead US import supply under this heading, with South Korea and Equatorial Guinea also among the top sources — an unusually diverse supplier mix reflecting varied refinery by-product streams worldwide. Precise compositional analysis and purity certificates are essential for correct 10-digit classification.