Silicone Ring Is Easy To Damage For A Long Time, Do You Know The Main Factors?

Silicone O-ring is the most widely used in a variety of sealing products, its production process is relatively simple, the use of the environment is also diverse, in our lives a variety of electrical equipment, small and medium-sized different models may have its figure appear, and its life also with the product equipment working medium has aging and deformation, so what causes it to appear these phenomena?

Seals are usually produced by extrusion assembly in the working environment. It creates contact pressure with the sealing surface in the device. When the pressure is greater than the pressure of the sealing medium, the sealing effect will be produced. If it is lower than the pressure, the seal failure will occur and the product deformation phenomenon will occur.

In the process of use, due to the different compound formulas of silicone rubber rings, the amount of contraction and stretching of O-rings produced by different enterprises is also different. When the product is in the compression state for a long time, the phenomenon of compression stress relaxation will occur. This situation has gradually expanded over time. The longer the time, the smaller the amount of compression and stretching, resulting in insufficient elasticity and leakage. The most direct way is to increase the cross-section size of the product, but this will also lead to an increase in the product structure.

Secondly, the temperature is related to the relaxation of the silicone seal. Temperature is very important for the relaxation of the silicone ring. No matter what kind of rubber material is used, it will accelerate its aging rate at high temperatures. When the temperature in the environment is high, when the product deformation exceeds 40%, the O-ring will slowly lose its elasticity, causing leakage. When installed, these seals create initial stress.

These seals relax for a long time and slowly disappear as the temperature gradually decreases. In some cases, they may dissipate with a sharp drop in temperature, and even if the rubber material is resistant to low temperatures, the stress generated at 20 degrees will not be greater than 25%. Therefore, when setting the initial stress during the installation of silicone seals, the working environment temperature must be fully considered.

Influence of working medium pressure on deformation of silicone seal ring. Compared with the above two factors, the medium pressure has a greater impact on the deformation of the silicone sealing ring. This is the reason why the sealing ring has different deformation, which is the most common situation under various working conditions. With the development of hydraulic equipment, the pressure of hydraulic medium is increasing. It works in this high pressure environment for a long time, will cause the overall deformation of the product is irreversible damage, and in this high pressure environment, the deformation of the sealing ring will lead to the material with the increase of temperature and aging acceleration.

Working fluid pressure is an important factor that causes permanent deformation of silicone rubber seal. Ancient hydraulic equipment worked under increasing pressure. Long-term high pressure will cause permanent deformation of silicone rubber O-ring seal. Therefore, the design should choose the appropriate pressure resistant rubber material according to the working pressure. The greater the working pressure, the higher the hardness and high pressure resistance of the material used.