abstract |
A buffer material is obtained by foaming a rubber composition containing an ethylene-propylene-diene rubber. In the buffer material, the content ratio of a sulfur atom calculated based on the measurement result of a fluorescent X-ray measurement, based on mass, is 1000 ppm or less, the buffer material has a 50% compressive load value of 0.1 N/cm 2 or more and 2.0 N/cm 2 or less, and the buffer material has a stress relaxation rate in a compressed state of 50% after 10 seconds of compression of 60% or more. |