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1.Material of Piston Hub:#45 steel or 40Cr forging
2.Material of Piston Cup: NBR,Polyurethane,HNBR
3.Service Life of Piston Cup: NBR≥200 hours;Regular PU ≥200 hours;Hihg-pressure PU≥300 hours;HNBR≥400 hours
4.Max. Temperature Resistance of Piston Cup: NBR≤120℃;Regular PU≤65℃; High-pressure PU≤120℃;HNBR≤150℃
