Description

Hydroxy-Terminated Butadiene Rubber is a reactive liquid polymer, also known as HTPB, characterized by terminal hydroxyl groups that enable its use as a versatile macroinitiator or prepolymer in advanced polymer synthesis. This functionality is critical for creating high-performance, cross-linked networks with tailored properties such as elasticity, low-temperature flexibility, and chemical resistance. It is an essential raw material for manufacturers in the aerospace, adhesives, sealants, coatings, and specialty elastomer industries seeking to formulate products with superior mechanical integrity.

Application

• Solid Rocket Propellant Binder: The primary application, serving as the polymeric fuel and binder matrix in composite solid propellants, providing excellent mechanical properties and processability.
• High-Performance Polyurethane Elastomers: Used as a polyol component to synthesize PU elastomers for demanding applications like rollers, gaskets, and impact-absorbing components.
• Aerospace Sealants and Potting Compounds: Formulated into elastomeric sealants and encapsulants that must withstand extreme thermal cycling and harsh environmental conditions.
• Specialty Adhesives and Coatings: Imparts flexibility, adhesion, and chemical resistance to industrial adhesives, waterproof coatings, and anti-corrosive linings.
• Composite Material Modification: Acts as a toughening agent and impact modifier for epoxy and other thermoset resin systems.
• Footwear and Sporting Goods: Used in the production of high-resilience midsoles, soles, and other elastomeric parts requiring durability and flexibility.

Basic Information

Product Name	Hydroxy-Terminated Butadiene Rubber (HTPB)
CAS No.	63231-65-2
Molecular Formula	(C4H6)n·(C4H8O)2
Molecular Weight	~2,800 - 3,500 g/mol (Typical Mn)
Synonyms	HTPB; Hydroxyl-terminated polybutadiene; Polybutadiene, hydroxy-terminated; Butadiene rubber, hydroxy-terminated; Liquid polybutadiene diol; R-45M; R-45HTLO; BD rubber, hydroxy-terminated; Reactive liquid polymer
EINECS	Contact for details

Quality Control

Our Hydroxy-Terminated Butadiene Rubber is manufactured under a stringent quality management system. Each batch is tested against critical parameters to ensure consistency and performance for demanding applications like propellant binders and high-specification elastomers. A comprehensive Certificate of Analysis (COA) detailing hydroxyl value, viscosity, molecular weight, and moisture content is provided with every shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 15-25°C (59-77°F). This product is hygroscopic (moisture-sensitive). To prevent moisture absorption and premature reaction, containers must be kept tightly sealed when not in use. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Hydroxyl Value (mg KOH/g)	0.70 - 0.80
Viscosity @ 30°C (cP)	5,000 - 7,000
Number Average Molecular Weight (Mn)	~2,800 - 3,500
Moisture Content (Karl Fischer)	≤ 0.05 %
Functionality (f)	2.0 - 2.2
Volatiles (%)	≤ 0.5

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.