Hydroxy-terminated polybutadiene

Hydroxy-terminated polybutadiene (CAS 69102-90-5), commonly known as HTPB, is a liquid reactive oligomer with hydroxyl end groups that allow it to be cured into flexible elastomeric networks.

It functions as a reactive binder, plasticizer, and crosslinkable base polymer across demanding industrial applications where low-temperature flexibility and chemical resistance are required for the final product.

In solid rocket propellant and explosive formulations, HTPB acts as the primary binder matrix, holding energetic fillers in a processable, castable composite for aerospace and defense sectors.

Polyurethane sealants and elastomers use HTPB as a soft-segment diol, reacting with isocyanates to produce systems with outstanding low-temperature performance for aerospace and construction joints.

In coatings and corrosion-resistant linings, it contributes flexibility and adhesion to substrates exposed to harsh chemical environments, ensuring long-term durability and structural integrity.

Adhesive formulators incorporate HTPB into structural and pressure-sensitive systems where elongation and impact resistance are critical performance requirements for industrial bonding applications.

HTPB is supplied as a viscous liquid at ambient temperature, typically in drum and IBC packaging. Standard commercial grades are characterized by hydroxyl functionality and molecular weight.

Both industrial and aerospace-qualified grades are available, with buyers typically referencing specifications such as R-45M or equivalent for propellant and high-performance elastomer applications.