🧩 BR – Polybutadiene Rubber
(A synthetic elastomer based on butadiene, recognized for its exceptional elasticity, high wear resistance, and impact durability. It features very high resilience and a low glass transition temperature of approximately –80 °C.)
🔹 What is BR
BR is the “resilience champion.” At ReplastMD, we treat this material as the ultimate choice for dynamic, anti-vibration applications. It has low mechanical hysteresis, meaning it returns energy efficiently during cyclic deformations. This makes it ideal for tires, engine mounts, and flexible joints that must withstand high fatigue and remain flexible even in the coldest climates.
🔧 Composition & Properties
- Polymer Base: Polybutadiene (cis-1,4 BR).
- Density: ~ 0.90 – 0.95 g/cm³.
- Thermal Range: Excellent performance down to –80 °C.
- Wear Resistance: High abrasion and fatigue resistance.
- Visuals: Highly elastic black rubber; smooth with rapid recovery.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Tires / Treads | All Manufacturers | Extreme wear resistance and elasticity |
| Engine Mounts / Bushings | VW, Toyota, Renault | Excellent vibration damping |
| Bellows / Elastic Covers | BMW, Dacia | Flexibility at low temperatures |
| Shock Absorber Rings | Hyundai, Peugeot | High elasticity and long service life |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Chemical Bonding | ✅ Recommended | Rubber adhesive (Loctite® 406 + 770 primer) |
| Local Vulcanization | ✅ Ideal | Possible with sulfur-based repair patches |
| Hot Air | ⚠️ 120 – 150 °C | Controlled heating for surface activation only |
💡 ReplastMD Recommendation: Repair via bonding or local vulcanization at ~140 °C using synthetic rubber adhesives. BR is the perfect material for dynamic parts, bellows, and mounts where extreme elasticity and shock resistance are mandatory.