Based on the ageing behavioral data of a certain silicone rubber sealing ring used in solid rocket mo鄄
tor,the power-exponent ageing model parameters and the regularity of ageing behaviour have been received using ap鄄
proximation and fit methods. The result of these tests reveals that storage of such type of silicone rubber for one month
at the temperature of 100益equals to 15 years storage at 25益. Simultaneously, numerical caculations about stress
distribution at the state of permanent compression deformation have been processed, and the state of stress distribution
of silicone rubber sealing ring after ageing is obtained, accordingt to which the view that the maximum strsess of per鄄
manent deformation with compression is smaller than that without compression is put forward. At the end of this pa鄄
per, relativity of stress distribution and permanent deformation is established. Taking thirty percent permanent com鄄
pression deformation as a rule, the storage life of silicone rubber sealing ring is about 12. 4 years.