KUMHO HBR is a high-cis polybutadiene rubber(BR) manufactured by solution-polymerizing 1,3-butadiene. Along with SBR, it is one of the widely spread synthetic rubber products because its Cis content is 96% or more resulting in higher wear resistance, resistive elasticity, aging resistance, and water resistance and it has very low glass transition temperature (Tg) of -100℃.