Styrene Butadiene Rubber is the most used rubber. SBR is a family of copolymers made by polymerising styrene and butadiene.
SBR is a relatively inexpensive and general-purpose rubber which can often be used as a good substitute for natural rubber.
SBR usually has superior abrasion resistance and heat ageing properties compared to NR. However, SBR typically has less resilience and strength.