PBR
Polybutadiene Rubber — a high-cis synthetic rubber with exceptional elasticity and dynamic performance. Reliance Relflex Cisamer grade, manufactured at Hazira.
The Performance Booster in Every Blend
PBR’s high-cis structure delivers unmatched resilience, crack resistance, and low rolling resistance — making it the essential performance ingredient in tyre compounds and technical rubber goods.
Exceptional Resilience
Highest rebound elasticity among synthetic rubbers. PBR quickly returns to its original shape after deformation — critical for tyre performance and bounce applications.
Low Rolling Resistance
Reduces energy loss during tyre rotation, directly improving vehicle fuel efficiency. A key performance attribute for modern fuel-efficient and EV tyre designs.
Superior Crack Resistance
Excellent resistance to flex cracking and fatigue. PBR compounds maintain integrity under millions of dynamic stress cycles in tyre sidewalls and industrial belts.
Low Temperature Flexibility
Glass transition temperature near −100°C delivers outstanding cold-weather performance. Compounds remain flexible in sub-zero operating conditions.
Blend Compatible
Blends readily with NR, SBR, and other rubbers to achieve targeted performance profiles. The go-to performance booster in multi-rubber compound formulations.
Low Heat Build-Up
Minimal heat generation under dynamic stress. Prevents performance degradation and premature failure in high-speed tyre and conveyor belt applications.
Where PBR Delivers
Tyre Treads & Sidewalls
Truck and bus radial tyres, passenger car tyres, and high-performance tyre compounds. PBR improves wear life and fuel efficiency simultaneously.
Technical Rubber Goods
Conveyor belts, industrial hoses, vibration mounts, and moulded components requiring high resilience and fatigue resistance.
Impact Modification
High-impact polystyrene (HIPS) and ABS modification. PBR improves impact strength in engineering plastics and protective equipment.
Sports & Leisure
Golf ball cores, shoe soles, and sports equipment. PBR’s exceptional bounce and resilience make it the material of choice for high-performance sports goods.
Key Properties
Core specifications for PBR (Cisamer grade). For full technical data — see the Technical Data Sheet.
| Polymer Type | High-Cis Polybutadiene (Nd-catalysed) |
| Cis-1,4 Content | ≥ 96% |
| Mooney Viscosity | 40 – 50 ML (1+4) @ 100°C |
| Specific Gravity | 0.91 |
| Tensile Strength | 15 – 18 MPa (compounded) |
| Glass Transition Temp | −100°C |
Blends Into Any Compound
PBR processes on standard rubber compounding equipment. Typically blended at 20–50% with NR or SBR. Compatible with carbon black, silica, and process oils.
Store in a cool, dry warehouse away from direct sunlight and heat sources. Keep bales in original Reliance packaging on pallets. Shelf life: 12 months from manufacture.
Need PBR for Your Compound?
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