Saturated Acyclic Hydrocarbons (Ethane, Butane, Pentane, and Others)

HTS 2901105000 captures saturated hydrocarbons produced through non-fossil routes — such as bio-based or synthetic processes. This distinction can affect duty treatment and is increasingly relevant as bio-based ethane and butane enter commerce. Importers must be prepared to document the production process and feedstock origin to support classification under this line versus the petroleum-derived lines.

N-butane (2901101020) and isobutane (2901101030) are structural isomers with distinct physical properties and end uses: n-butane is primarily used in gasoline blending and LPG, while isobutane is a preferred refrigerant blend component and aerosol propellant. Correct isomer identification on entry documents is essential because misclassification between these lines can trigger CBP penalties and complicate downstream regulatory compliance for refrigerant applications.