SLSK-49B plasticity tester is suitable for determining the plasticity of raw rubber, plasticized rubber, mixed rubber, in accordance with the national standard GB/T12828-1991 "Determination of plasticity value and recovery value of raw rubber and mixed rubber-parallel plate method" The rubber specimen will be placed in the pressurized hammer between the smooth planes, compressed under a certain temperature, load for a certain period of time, and measured test Before and after the test, the change in height of the specimen is measured. The size of the deformation of the specimen is called the plasticity of the rubber specimen.