A comparative study on the properties of S
BR1721 and SBR1712 was made.The results showed that when compared to SBR1712，SBR
1721 gave similar processibility of both raw rubber and compound；and its vulcani
zate presented higher hardhess，tensile strength and elongation at break，similar
modulus at 300% and tear strength，improved wet traction and steering ability，but
higher heat build-up and poorer wear resistance.In general，SBR1721 was an idea
l synthetic rubber for tread compound of speed-rated radial passenger car tire.
