Product Description
Product Name: Hydroxyl-Terminated Polybutadiene (HTPB)
CAS No.: 69102-90-5
Standard: MIL-H-85497 / GJB 1327A
Hydroxyl-Terminated Polybutadiene (HTPB) is a high-performance liquid rubber with a main chain consisting primarily of cis-1,4-butadiene units, terminated at both ends with hydroxyl (–OH) groups.
Through reaction with isocyanates or cross-linking agents, HTPB forms a three-dimensional polyurethane elastomer network featuring excellent mechanical strength, flexibility, chemical resistance, and electrical insulation.
With its outstanding low-temperature toughness (brittle point below –70 °C) and superior hydrolysis resistance, HTPB is widely used in solid propellants, polyurethane elastomers, potting and sealing compounds, coatings, adhesives, and polymer modification applications.
1. High Batch Consistency for Advanced Formulations
HTPB is a mixture rather than a pure compound; many buyers struggle with variations in hydroxyl value, molecular weight, and viscosity between batches.
Our Solution:
We employ dual-method quality control (GPC + VPO) to ensure narrow molecular weight distribution and hydroxyl value deviation < ±0.02 mmol/g, guaranteeing consistent performance and formulation reproducibility for propellant and adhesive systems.
2. Superior Low-Temperature and Water Resistance for Harsh Environments
Traditional polyether or polyester-based polyurethanes tend to degrade under humid or low-temperature conditions.
HTPB Advantages:
• Ether-free and ester-free backbone → Excellent hydrolytic stability and chemical resistance
• Cured product brittle temperature < –70 °C → Maintains elasticity and toughness
Ideal for aerospace, cryogenic systems, defense equipment, and outdoor structural materials.
3. Excellent Electrical and Thermal Cycling Properties
• Electrical insulation comparable to epoxy and silicone rubber
• Low vapor permeability and water absorption
• No cracking under thermal cycling (–55 °C ~ +130 °C)
→ Perfect for electrical potting, sealing, and moisture-proof insulation materials.
4. Easy Processing and High Workability
HTPB is a transparent viscous liquid that can be mixed, poured, and cured at room temperature — highly compatible with automated production lines.
• Suitable for on-site casting
• Retains both rubber-like elasticity and structural strength after curing
• Supports continuous production of large-scale components, encapsulants, and coatings
5. Custom Molecular Design Capability
We can design and produce customized HTPB grades tailored to customer processing requirements:
• Hydroxyl value (OH value): 0.47 – 1.4 mmol/g
• Molecular weight (Mn): 1600 – 4600 g/mol
• Viscosity (40 °C): ≤ 9.5 Pa·s
Available options:
• Modified HTPB (Type I–VI)
• Hydrogenated HTPB (for improved aging resistance)
• Single- or multi-functional hydroxyl-terminated LPBOH structures
| HTPB (GJB1327A) | RF-I | RF-II | RF-III | RF-IV | RF-V | RF-VI |
| Appearance | Colorless or light-yellow transparent liquid, with no visible impurities. | |||||
| Hydroxyl value, mmol/g | 0.47-0.53 | 0.54-0.64 | 0.65-0.7 | 0.71-0.8 | 0.81-1.0 | 1.0-1.4 |
| Mn, ×103 | 3.8-4.6 | 3.3-4.1 | 3.0-3.6 | 2.7-3.3 | 2.3-3.0 | 1.6-2.4 |
| Viscosity(40℃), Pa.s | ≤9.5 | ≤8.5 | ≤4.0 | ≤3.5 | ≤5.0 | ≤3.0 |
| Moisture, % | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.1 | ≤0.1 |
| * In addition：We can research and develop the new HTPB according to the special demand of our clients． | ||||||
• High rubber elasticity (> 80% 1,4-bond structure)
• Excellent low-temperature flexibility (brittle point < –70 °C)
• Superior water and chemical resistance (ether- and ester-free backbone)
• High wear and impact resistance
• Low glass transition temperature (Tg ≈ –75 °C)
• Outstanding electrical insulation and low moisture absorption
• Compatible with various fillers (carbon black, talc, process oils)
• Excellent fluidity for automated and on-site potting processes
• Solid propellant binder (HTPB/AP/Al systems)
• Polyurethane elastomers and structural components
• Coatings and anti-corrosion layers (weather- and impact-resistant)
• Adhesives and sealants
• Electrical potting and insulation materials
• Waterproof and anti-corrosive building coatings
• Rubber and resin modification additives
• Lightweight damping and composite materials
• Automotive, aerospace, and marine structural parts
• Package: 200 L iron drum (approx. 170 kg per drum)
• Storage: Keep in a cool, dry, and well-ventilated place (–20 ~ 38 °C)
• Shelf Life: 12 months (may still be used after re-inspection and approval)
• Transportation: Protect from moisture and sunlight; avoid contact with strong oxidizers
Looking for a trusted hydroxyl terminated polybutadiene manufacturer or bulk HTPB supplier?
Contact Ruifeng today for pricing, technical consultation, or sample requests.
Product Consistency:
Stable quality and reliable performance in every batch.
Stable Supply:
Own factory ensures long-term and steady supply.
Free Samples:
Free samples available for testing and evaluation.
Global Logistics:
Experienced in international shipping and hazardous export.
