Physical properties:
- Minimum crack resistance is high. At 100 degrees Celsius it will lose 60% of the crack resistance.
- Low heat, at 94 degrees Celsius vulcanized rubber lost 2/3 strength and 30% stretch. .
- large crack.
- The amount of energy consumed in pre-cooking, large mixing. Long-term plasticity decreases.
- Low plasticity so it is difficult to fill the mold, can increase flexibility with naphthalene oil, pine resin ...

- Endothelial heat is greater than natural rubber, causing major damage to the product being crushed repeatedly.

- SBR cure rate is slower than natural rubber.