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HTPB (Hydroxyl-Terminated Polybutadiene(HTPB) CAS No. 69102-90-5 )
Chemical Name: Hydroxyl-terminated polybutadiene
Code: HTPB
CAS No. 69102-90-5
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Hydroxyl-Terminated Butadiene-Styrene Random Copolymer(HTBS) HTBS
Hydroxy-terminated Butadiene-styrene Random Copolymer
HTBS
Chemical Name: Hydroxy-terminated Butadiene-styrene Random Copolymer
Aliases: Hydroxyl-terminated butadiene-styrene liquid rubber
Code: HTBS
Product Description
HTBS(Hydroxyl-terminated butadiene-styrene random copolymer, also known as hydroxyl-terminated styrene-butadiene liquid rubber) is a low-molecular telechelic polymer with butadiene-styrene backbone and terminal reactive hydroxyl groups. It can be chain-extended into high polymers. Owning properties of solid SBR, it is applied in casting and sealing materials. Its superior insulation and abrasion resistance overcome processing limitations of solid styrene-butadiene rubber.
Product properties & Features
1. Dual Reactivity (Hydroxyl + Double Bond): Terminal hydroxyl groups cure with isocyanates (forming PU), while double bonds crosslink with sulfur/peroxides, enabling controllable crosslink density and high adhesive strength.
2. Balance of Rigidity and Toughness: Styrene segments enhance hardness, heat resistance, and abrasion resistance, while butadiene segments ensure low-temperature flexibility and elasticity—outperforming pure HTPB in comprehensive properties.
3. Low Viscosity & Easy Processability: Castable, potting, and coatable at room temperature; solvent-free and low VOC, suitable for molding complex components.
4. Aging Resistance & Electrical Insulation: Better main-chain saturation than solid SBR, offering excellent ozone resistance, hydrolysis resistance, and electrical insulation with a low dielectric constant.
Applications
Polyurethane Elastomers: Cast tires, shock-absorbing parts, and wear-resistant rollers, providing high resilience, low heat build-up, and tear resistance.
Electronic Potting & Insulation Materials: Potting for high-voltage transformers, sensors, and PCBs, delivering moisture resistance, temperature resistance, insulation, and vibration resistance.
Adhesives & Sealants: Automotive windshields, construction joints, and pipe seals, featuring strong adhesion, weather resistance, and oil resistance.
Epoxy/Resin Modification: Toughening epoxies to enhance impact and fatigue resistance, used in composites and structural adhesives.
Specialty Coatings: Anti-corrosion, waterproof, and damping coatings with strong adhesion, aging resistance, and crack resistance.
Packing & Storage
50kg/plastic drum or 180kg/metal drum packaging.
Storage should be cool, dry and ventilated. 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 | HTBS-1 | HTBS-2 | HTBS-T |
| Molecular weight | 2000-3000 | 2000-3000 | 2000-5000 |
| Hydroxyl value (mmol/g) | 0.6-1.2 | 0.6-1.2 | 0.2-1.0 |
| Styrene content (mol %) | 10-15 | 15-25 | 10-40 |
| Viscocity (40℃/104°F, Pa·s) | ≤20 | ≤60 | ≤20 |
*NOTE: We can research and develop any new versions of HTBS according to the special demand of our clients.
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