PBAN - Polybutadiene Acrylonitrile copolymer. Also noted as Polybutadiene — Acrylic Acid — Acrylonitrile terpolymer.

This was the binder formulation widely used on the 1960-70's big boosters (e.g., Titan III and Space Shuttle SRBs). It is also sometimes used by amateurs due to simplicity, very low cost, and lower toxicity than the more common HTPB. HTPB uses isocyanates for curing, which are generally toxic. The Space Shuttle Solid Rocket Booster (SRB) is the rocket that provides most of the thrust required to launch the Space Shuttle into Low Earth orbit. ... Hydroxy-terminated polybutadiene (HTPB), a butadiene, is a stable and easily stored synthetic rubber, often used in tire manufacturing. ...

PBAN is normally cured with the addition of an epoxy resin, taking several days at elevated temperatures to cure. Epoxy or polyepoxide is a thermosetting epoxide polymer that cures when mixed with a catalyzing agent or hardener. Most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol-A. The first commercial attempts to prepare resins from epichlorohydrin occurred in 1927 in the United States. ...