What are the reasons for the aging problem of O-rings?

Users who use O ring have found that O-rings have aging problems very early in the process of use? Sometimes O ring do not reach the service life under normal conditions at all! Why is this? Causes O ring aging What are the reasons? Next, Jiadong will introduce to you.


O ring aging is very common in life, but if the aging is very serious, then you should pay attention to it, it may be the problem of your use.


Under normal circumstances, O ring aging is related to 4 factors:

1. Ozone: The chemical activity of ozone is much higher than that of oxygen, and it is more destructive. It also breaks the molecular chain, but the effect of ozone on rubber varies with rubber deformation. When used as deformed rubber (mainly unsaturated rubber), cracks in the direction of stress action, so-called "ozone cracks" appear; when acting on deformed rubber, only an oxide film is formed on the surface without cracking.


2. Light: We all know that the shorter the light wave, the greater the energy. The damage to the miscellaneous parts of silicone rubber is the high-energy ultraviolet. In addition to directly causing the breakage and crosslinking of the rubber molecular chain, the ultraviolet can also cause the rubber to generate free radicals due to the absorption of light energy, and initiate and accelerate the oxidation chain. reaction process. Secondly, direct sunlight will play a heating role through outside light. Another characteristic of light effect is that it mainly grows on the surface of oak.


3. Oxygen: Oxygen undergoes free radical chain reaction with rubber molecules in the rubber, and the molecular chain is broken or excessively cross-linked, causing changes in rubber properties. Oxidation is one of the important reasons for rubber aging.


4. Heat: An increase in temperature will cause thermal cracking or thermal crosslinking of rubber. But the basic function of heat is activation. Increase the oxygen diffusion rate and activate the oxidation reaction, thereby accelerating the rubber oxidation reaction rate, which is a common aging phenomenon-thermal oxygen aging.


What I have introduced above is the cause of the aging problem of O-rings. I hope it can be helpful to everyone.


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