A rubber roller formed by molding an elastomer composition not less than 250
s
nor more than 400 s in a T2 relaxation time (spin-spin relaxation)
of a bound rubber formed between a rubber and/or a thermoplastic elastomer and
a reinforcing filler. EPDM can be used as the rubber and/or the thermoplastic elastomer,
carbon black as the reinforcing filler, and an organic peroxide as a crosslinking
agent. The T2 relaxation time (spin-spin relaxation) of the bound rubber
formed between the rubber and/or thermoplastic elastomer and the reinforcing filler
is more than a T2 relaxation time of a bound rubber of the rubber and/or
thermoplastic elastomer to which the reinforcing filler is not added by not less
than 150% nor more than 300%.
