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Hydroxyl-Terminated Polybutadiene(HTPB) CAS No. 69102-90-5 HTPB

Chemical Name: Hydroxyl-terminated polybutadiene

Code: HTPB

CAS No. 69102-90-5

Chemical name: Hydroxyl-terminated polybutadiene

CAS No.: 69102-90-5

Code: HTPB

Standard: GB/GJB(GJB1327A-2021)

HS CODE: 3902 9000.30

Feature: 10,000 MT annual capacity & Customization of various specifications is available.

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Product Description
Product Properties
Applications
Packing & Storage
Technical Index

Product Description

HTPB(Hydroxyl-Terminated Polybutadiene) is a high-molecular polymer synthesized from butadiene monomers. It carries reactive hydroxyl groups at both ends of molecular chains and exists as a low-viscosity liquid at room temperature.

As a reactive liquid rubber, its polybutadiene backbone and terminal hydroxyl structure deliver high curing reactivity, excellent process fluidity and comprehensive mechanical properties.

It reacts with chain extenders and crosslinkers under ambient or high temperatures to build a three-dimensional crosslinked network. The cured material boasts superior mechanical performance, good hydrolysis resistance, acid & alkali resistance, abrasion resistance, outstanding low-temperature toughness and excellent electrical insulation.

A high-performance liquid polyol, HTPB is widely used in adhesives, sealants, coatings, electronic potting compounds and elastomers.

Product properties & Features

The performance properties of HTPB as follow:

Reactive terminal hydroxyl groups
Pale, high-clarity low-viscosity liquid
Excellent mechanical performance with glass transition temperature down to -80 ℃
Remarkable low-temperature flexibility & cold resistance
Superior hydrophobicity and water resistance
Ultra-low moisture vapor permeability
Great resistance to hydrolysis, aqueous acids, alkalis and various chemicals
Outstanding abrasion resistance
Strong adhesion to various substrates
Premium electrical insulation properties
Good compatibility with multiple resin systems

Performance Comparison: HTPB VS CTBN VS CTPB VS ATBN VS HTBN

Item	End Group	Main Chain Structure	Main Curing System	Key Characteristics	Typical Applications
HTPB	-OH	Pure polybutadiene	Isocyanate	Low viscosity, good processability, excellent mechanical properties, hydrolytically stable	Solid rocket propellant binder, coatings, adhesives, elastomers
CTBN	-COOH	Butadiene-acrylonitrile copolymer	Epoxy resin / Isocyanate	Contains acrylonitrile units, good oil resistance, excellent compatibility with epoxy resins	Epoxy resin toughening modification, structural adhesives, composites
CTPB	-COOH	Pure polybutadiene	Epoxy resin / Isocyanate	No nitrile groups, good low-temperature performance, high purity, relatively high reactivity	Solid propellant binder (less common), elastomers, sealants
ATBN	-NH₂	Butadiene-acrylonitrile copolymer	Epoxy resin (high reactivity)	Contains acrylonitrile, fast amine-end reaction, rapid cure with epoxy systems	Fast epoxy curing systems, adhesives, tough coatings
HTBN	-OH	Butadiene-acrylonitrile copolymer	Isocyanate	Contains acrylonitrile units, combines hydroxyl reactivity with moderate oil resistance	Polyurethane elastomers, adhesives, oil-resistant sealing materials

Applications

Adhesives
Coatings
Solid Propellants
High-performance Structural Adhesives & Sealants
Rubber & Plastic Products
Electrical Insulation Materials
Polyurethane (PU) Elastomers
Composite Materials for Automotive & Aerospace
Construction Materials: Roof Waterproofing, Anti-corrosion & Thermal Insulation Materials, Construction Adhesives
Electronic Potting & Encapsulation Compounds
Polymer Modification

Packing & Storage

50kg/plastic drum or 170kg/metal drum packaging.

Storage should be cool, dry and ventilated. The optimum temperature is -20~38℃.

The shelf life is 12 months, after the expiration of the re-inspection can still be used.

Avoid rain and sun during transportation. Do not mix with strong oxidants.

Technical Index

Item	Grade l	Grade ll	Grade lll	Grade lV	Grade V	Grade VI	Grade VII
Appearance	achromatous or light yellow, no visible impurities
Hydroxyl value,(mmol/g)	0.47-0.53	0.54-0.64	0.65-0.70	0.71-0.80	0.81-1.20	1.21-1.60	1.61-2.00
Viscosity(40°C Pa.s)≤	9.5	8.5	4.0	3.5	4.0	3.0	3.5(30℃）
Peroxide mass fraction,%	0.04	0.04	0.05	0.05	0.08	0.10	0.15
Moisture,wt% ≤	0.05	0.05	0.05	0.05	0.10	0.10	0.10
Volatile Content,% ≤	0.5	0.5	0.65	0.65	0.75	0.75	0.90
Molecular weight	3800-4600	3300-4100	3000-3600	2700-3300	2000-3000	1300-2500	1000-2000

NOTE: We can customize HTPB according to customers' applications and specification requirements, including mono-functional, hydrogenated, and epoxidized HTPB.

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