Hydroxyl-terminated polybutadiene

Hydroxyl-terminated polybutadiene

Hydroxyl-terminated polybutadiene (HTPB) is a polymer of butadiene terminated at each end with a hydroxyl functional group. It belongs to a class of polymers known as polyols. It is used to react with a diisocyanate to form a polyurethane, a stable and easily stored synthetic material.

Physical properties

HTPB is a clear, viscous liquid. The properties cannot be precisely stated, because HTPB is manufactured in various grades to meet specific requirements. HTPB is thus a generic name for a class of compounds.


HTPB is used in many solid rocket motors to bind the fuel and oxidizing agent into a solid mass. It is also used as a hybrid rocket fuel. Together with N2O (nitrous oxide, or "laughing gas") as the oxidizer, it is used to power the SpaceShipOne hybrid rocket motor developed by SpaceDev. [cite web |url=http://www.spacedev.com/hybrid_detail.php?id=1 |title=SpaceDev Hybrid Propulsion |publisher=SpaceDev] It also powers all 3/4 stages of the Japanese M-5 rocket satellite launchers. JAXA describe the fuel as "HTPB/AP/Al=12/68/20" which means, proportioned by mass, HTPB 12% (binder and fuel), Ammonium perchlorate 68% (oxidizer), and Aluminium powder, 20% (fuel).


External links

* [http://www.sartomer.com/techlitbreakdown.asp?plid=7 Technical Literature] , from Sartomer, a manufacturer of HTPB

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