We have many years' experience for producing the EPDM,NBR,Silicone,Viton FKM,FPM,Fluorelastomer O-ring, we exported o-ring part to USA, Europe and egypt. The o-ring for PDM,NBR,Silicone,Viton FKM,FPM etc,  it is used in the mechanical industrial fields.  The hardness of Viton,FKM/FPM o-ring always from 45-85 shoreA.If you have some very difficult for o-ring, we can produce the o-ring according to your requirement.Welcome the small qty order for viton, FKM/FPM O-ring.