Epdm rubber seals for hydraulic cylinders

摘要: The invention relates to EPDM rubber seals for use in hydraulic cylinders such as the of automotive brake and clutch systems. Using an composition carefully formulated so be good kneadability, having resistance yielding or loss resiliency by fatigue well sufficient strength elongation are obtained. Essential components 100 parts weight coplymer rubber, 30-80 carbon black 1-5 a peroxide cross-linking agent. It is important copolymer which distribution ethylene uneven that content highest fraction molecular lowest another weight. difference between these two fractions should more than 5 wt % not 9 %.