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The advantages of rubber O-ring are as follows:
1) The sealing part has the advantages of simple structure, compact installation part and light weight.
2) Has the effect of self-sealing, often only one seal can complete the seal.
3) Good sealing performance, almost no leakage when used as static seal. When used for reciprocating motion, the sealing performance is unchanged in the reciprocating travel, the leakage is very small, only some leakage when the speed is higher.
4) The friction resistance is very small, and it can also adapt to the occasion of alternating pressure.
5) Size and groove standardization, low cost, easy to use and outsourcing. Because of the above advantages of O-ring, it is widely used in various mechanical equipment.

Causes of deformation of oil-resistant O-ring
(1) Factors of compression and tensile amount of O-ring
Because of the different formula of O-ring compound, so different enterprises produce O-ring compression and tensile amount is different. The product in the long-term state of compression will produce compression stress relaxation imagination, this phenomenon will gradually expand with time, the longer the time the amount of compression and tension will be smaller, so that the lack of elasticity leads to leakage phenomenon, the most direct change method is to increase the section size of the product, but also lead to the increase of the product in the structure.
(2) The relationship between temperature and O-ring tensioning process
Temperature is very important for the relaxation of O-ring. No matter what kind of rubber material is, it will accelerate its aging speed at high temperature. The higher the temperature in the environment, the greater the deformation of gas compression will be. When installing the O-ring there will be initial stress, these will sleep the sealing ring for a long time relaxation and gradual reduction in temperature and slowly disappear, in some cases may disappear with a sharp drop in temperature, even if the rubber material is resistant to low temperature, compared to the stress generated at 20 degrees, is not greater than 25%, Therefore, when setting the initial stress in the installation of O-ring, we should fully consider the temperature factor in the working environment.