SBR for an emulsion; SSBR for a solution:
Composing:
SBR and SSBR are derived from petroleum oil. SBR represents half of all synthetic rubber production, and is much consumed in tires, where it competes with and complements NR. There are many subgroups of the raw gum elastomer, depending on the method of synthesis of the polymer, such as whether it is solution or emulsion polymerized, and the ratio of the two major chemical building blocks styrene and butadiene.

Properties and Applications:
In comparison with natural and CR, gum vulcanizates made from SBR have poor mechanical properties. The raw gum elastomer must have reinforcing fillers, such as carbon black, in order to attain good mechanical strength and the filler increases hardness at the same time.

The properties of SBR are broadly similar to NR, for chemical, solvent, and weather resistance. The upper temperature heat aging resistance limit is a little higher. The cost of the raw gum elastomer is low on the relative scale for elastomers in general and is comparable with NR.