... .material:NR, SBR, CR, SIL, HN.BR, FSIL,etc Age resistance Elastic cushion of Type X 1.Used with Elastic cushion of ... Type X2.Material:NR, SBR, CR, SIL, HN.BR, FSIL,etc3. ... work environment of the rubber parts, choosing the best material. Age resistance Elastic cushion of Type X