The quality of hydraulic sealing technology will affect the working quality and service life of hydraulic supports. So what performance indicators should hydraulic seal products have?
1. Temperature resistance performance
The working temperature of the seal depends on the temperature of the sealing medium and the temperature rise of the seal itself during movement. Temperature directly affects the sealing performance. Excessive temperature often accelerates the aging of sealing materials, reduces their elasticity, hardness, and other properties, leading to material hardening; Low temperature can also lead to accelerated hardening of materials, loss of elastic properties, and reduced sealing effectiveness of materials. In summary, materials with a certain temperature range should be used.
2. Dielectric resistance
Because the swelling degree of materials in the medium is a key factor in the sealing performance, the factor to consider when selecting hydraulic seal materials is whether the selected material can be well compatible with the sealing medium; If the sealing material is compatible with the sealing fluid, it can cause the seal to expand or contract, leading to failure in the early stages of use. The expansion of the seal causes an increase in frictional resistance and also causes the seal to roll. Shrinkage of the seal will cause a decrease in preload, a decrease in eccentricity compensation capability, and eventually lead to leakage.
3. Wear resistance performance
The wear resistance of materials is one of the important performance indicators of dynamic seals. Good wear resistance and long service life. The wear resistance of materials is closely related to their hardness. The higher the hardness of the material, the better the wear resistance and the longer the service life.
4. Tensile strength
Because the tensile strength of general sealing materials tends to decrease with increasing temperature, when selecting materials, it is necessary to consider their actual mechanical strength at high operating temperatures and high temperatures. If the tensile strength is too low, it will cause a certain amount of stress relaxation or even permanent deformation, resulting in seal failure. The tensile strength is too high, and the performance requirements for the material are too demanding. Therefore, when selecting materials in practice, the tensile strength of the material should be comprehensively considered.
5. Permanent deformation
Because the sealing ability of hydraulic seals mainly relies on their recoverable compression deformation within the sealing groove. So, the permanent deformation of the selected sealing material should be small, the elasticity should be strong, and the rebound force should be high. In addition, the permanent deformation of materials is also related to temperature changes, as high or low temperatures can increase the permanent deformation.
6. Elasticity
The so-called squeeze type seal refers to a sealing method that relies on the rebound force generated by the sealing material itself after being compressed to obtain sealing ability. Because lip seals may have a certain amount of eccentricity, it is necessary to rely on the elasticity of the material to compensate for issues such as insufficient contact stress in the seal. So, the elasticity of the material is crucial for the quality of the sealing effect.
7. Hardness
Hardness is an important indicator of sealing materials, mainly determined by the roughness of the sealing surface. When the sealing surface is relatively rough, the hardness of the seal should be low to ensure good sealing effect. For areas with high sealing pressure, it is necessary to increase the hardness of the seal appropriately to prevent excessive deformation of the seal and prevent it from being squeezed out. In addition, the hardness of the material has the characteristic of decreasing with the increase of usage temperature, and the high hardness also results in strong wear resistance of the material.
2025 September 1st Week VAFEM Product Recommendation
Shock absorber bushings come in common forms – rubber and metal. Rubber bushings are at the top and bottom of the shock absorber and are used to attach the shock to the vehicle’s frame and control arm. These bushings are sometimes spherical plain bearings or rod ends in a rubber housing.
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2025-09-04