Analysis on the Reasons Affecting the Service Life of Rubber Sealing Ring

Analysis of the reasons affecting the service life of rubber seals

The service life of rubber seals is usually affected by three factors: mechanical force, oxidation and ozonation. Under normal circumstances, the rubber sealing ring becomes brittle and the growth of fatigue cracks accelerates. Lowering the critical fracture energy will reduce its life. The factors affecting the life of specific rubber seals mainly include the following aspects:

Aging will cause a mechanical cracking reaction under the action of mechanical force: due to the viscous nature of high molecular polymers, the relaxation process of rubber during the deformation cycle is too late to complete, and then it enters the next deformation cycle. As a result, the internal deformation and residual stress of the rubber sealing ring continue to increase. When the stress gradient is large, it will cause the rubber molecular chain to break directly to generate free radicals, and then cause the free radical oxidation chain reaction of the rubber to age under the action of oxygen.

Aging will activate the oxidative cracking reaction of mechanical force: when the rubber sealing ring is repeatedly deformed during the sealing process, its mechanical stress will weaken the atomic valence force in the rubber molecular chain, thus reducing its activation energy of oxidation reaction . The reduction of oxidative activation energy makes the oxidative cracking reaction of the rubber molecular chain easier and accelerates.

The internal heat generation of the rubber sealing ring accelerates the oxidation reaction: the rubber sealing ring will produce hysteresis during repeated deformation and cause internal friction, which will cause the internal heat of the rubber, which further accelerates the oxidation chain reaction of the rubber and aging.

Ozone cracking of rubber sealing ring: Ozone cracking occurs during the aging process of the rubber sealing ring periodically deformed. This phenomenon is more pronounced under high temperature conditions.

The above introduction is the reasons that affect the service life of rubber seals. I hope it can be helpful to you. If there is anything you don’t know, you can directly communicate with our customer service. We will serve you wholeheartedly, thank you for your Watch.

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