... offer others materials: EPDM NBR VITON HNBR PU PTFE PA SI SI O ringSuitable for hydraulic pneumatic parts,and machinery equipment inrotary ... .cm(according to o-ring material).3)Material:PTFE,NBR,SI,VITON,HNBR.Specification:1)ID From 0.74mm to 670mm2 ... Japan(o-ring JIS B-2401) are available. water resistance SI O ring