The material which made of silicone O sealing ring is synthetic rubber .It is belong to viscous-elastic material The initial setting Compression and rebound congestion will Produce permanent deformation and lost, eventually leak for use a long time .
The reason of permanent deformation about silicone O sealing ring :
1.The temperture affect O sealing ring permanent deformation. High temperature will accelerate the aging of rubber materials. Working temperature is higher, the greater the compression permanent deformation of silicone O sealing ring.
2, Compression ratio and tensile impact permanent deformation
silicoen O sealing ring used in the permanent deformation of the production of various rubber formula, under the compression state produces compression stress relaxation phenomenon, at this point, the compressive stress will decrease as the growth of the time. For a long time, the compression rate and tensile amount is larger, the stress produced by rubber stress relaxation and the greater the fall, so that the elasticity of silicone O sealing ring, sealing ability.
3, The pressure of work medium may caused silicone O sealing ring permanent deformation
the pressure of work medium is a major cause of silicone O sealing ring permanent deformation. Modern hydraulic equipment work stress are increasing. Long time high pressure effect will make silicone O sealing ring permanent deformation. Therefore, the design should be appropriate according to the working pressure of compression rubber material. Working pressure is higher, the hardness of the material used and high voltage resistance should be higher.

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