Life evaluation method of the rubber seal material

摘要

PROBLEM TO BE SOLVED: To provide a life evaluation method of a rubber seal material capable of evaluating highly accurately the life of the rubber seal material by pulse method NMR.SOLUTION: In a life evaluation method of a rubber seal material, a spin-spin relaxation time Tof the rubber seal material is measured by pulse method NMR. An obtained Trelaxation curve (free induction decay curve) is divided into a Tcomponent having a short relaxation time and a Tcomponent having a long relaxation time, and the life of the rubber seal material is evaluated based on T.