Experiment of Viscous Friction Characteristics of Fluorous Rubber O-rings at Low Gas Seal Pressure

Viscous friction characteristic of fluorous rubber O-rings under low gas pressure was investigated. The effects of seal pressure, O-ring compression ratios and velocity of friction arm on the O-ring's viscous friction were analyzed based on the measurement of frictional force between fluorous rubber O-rings and stainless steel 2Cr13. The results show that the friction increased with the increasing of O-ring compression ratio, and it showed obvious rebound characteristics as the friction (hysteresis) increased. The maximum friction force, the sliding friction force and the hysteresis friction force presented a non-linearly increased with the increasing seal pressure. With the decreasing of reciprocating velocity, the friction force increased, while the gas pressure corresponding to maximum friction force decreased.