Causes of general damage to seals

General causes of damage to seals

1. The use temperature of the seal exceeds the specified value

Low temperature will make the seals of polyurethane, rubber and other materials become brittle and brittle due to freezing, and the elasticity will decrease, and even the entire seal becomes hard and brittle, causing leakage. The high temperature will make the volume expansion of the seal soft, resulting in a rapid increase in friction resistance and a decrease in pressure resistance of the seal during movement. It is recommended that the operating environment should not exceed the applicable temperature specified in the performance table. Excessive movement speed, unsuitable surface roughness, and poor lubrication will cause friction and heat generation, so that the local temperature exceeds the use temperature and it is easy to cause poor sealing and cause leakage.


2. Using the condition of too high online speed to cause carbonization to form a leak

In the sealing industry, the speed used is generally divided into three levels: low speed 0 ~ 0.8m / s; normal speed 0.8 ~ 2m / s; high speed 2 ~ 5m / s; the performance of the seal is affected differently at different speeds If the performance and quality of the seal do not match the actual working conditions, it will cause damage to the seal.


3. The pressure is too high, the hardness of the seal is small and it is pushed out of the metal groove

In a high-pressure environment, seals are easily deformed by compression, and materials with insufficient hardness are easily squeezed out. The precision of processing of grooves and seals also affects the sealing performance.



4. The hardness is too high, the seal cannot fill the metal groove completely

If the hardness is too high, it is easy to leave a gap between the metal groove and the seal, causing leakage and also causing damage to the seal. When selecting the sealing material, the use environment and the performance of the material itself should be combined.


5. Used in media with PH exceeding the specified value, the seal is softened or dissolved. Different materials have different tolerances to substances with different chemical properties. Non-professional testing and selection may cause the seal to react with the sealing medium, resulting in Damaged and leaking seals.
6. The size of the seal does not match the groove

The size and processing of the seal are not precise enough, which will directly damage the seal during installation and disassembly, and will also cause leakage due to its inconsistency with the size of the groove during use.


7. Long-term use will inevitably cause wear


8. The storage time of the seals exceeds the quality guarantee period, aging causes leakage

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