Polybutadiene acrylonitrile (PBAN)[1] copolymer, also noted as polybutadiene—acrylic acid—acrylonitrile terpolymer[2] is a copolymer compound used most frequently as a rocket propellant fuel mixed with ammonium perchlorate oxidizer.

[3] It was the binder formulation widely used on the 1960s–1970s big boosters (e.g., Titan III and Space Shuttle SRBs).

Polybutadiene acrylonitrile is also sometimes used by amateurs due to simplicity, very low cost, and lower toxicity than the more common hydroxyl-terminated polybutadiene (HTPB).

PBAN was to be used in the Constellation program, later canceled, as this copolymer was to be used in the first stage of the Ares I rocket in five segments.

However future versions of Ares I were discussed using liquid propellants as a potential alternative.