1、 Hydraulic seal Temperature of material

Hydraulic Sealing element Not only the use ability of hot high temperature, but also the use condition of cold low temperature resistance should be considered. Under the use of hot state and high temperature, the sealing material will begin to soften at a certain point (this is the high temperature resistance rate) or change in chemical substances. Under the condition of cold anti low temperature use, the sealing material will begin to harden at a certain point, which will make the seal brittle until the seal cracks.

2. Elastic properties of hydraulic seals

Since the tensile strength of all elastomer sealing materials is lower than that of other sealing materials. When the tensile strength decreases, the elastomer will be damaged if it is lower than the normal value due to the influence of the surrounding environment or incorrect assembly.

3. Elongation property of hydraulic seal material

The elongation in the use temperature range of the rubber seal refers to the percentage of the elongation of the hardened sealing material in the original length under tension. The percentage of the increased length of the gauge length of the section and the initial length of the pattern after the pattern breaks during the tensile test of the metal is called the elongation. The elongation reflects the plasticity of the material. The greater the elongation, the greater the plasticity.

4. Hardness resistance of hydraulic seal materials

Elastomer rubber sealing materials will form different hardness points. Such as type O seal ring The Shore hardness range of is usually 60-90 hardness units. The harder O-ring seals form extrusion resistance, and the O-ring has lower explosive or sliding friction properties.

5. Compression and tension of hydraulic seals

Due to the different formula of O-ring compound, the compression and tension of O-ring produced by different enterprises are also different. Under long-term compression, the product will produce the imagination of compressive stress relaxation. This phenomenon will gradually expand over time. The longer the time is, the smaller the compression and tension will be, which will lead to the leakage phenomenon due to its insufficient elasticity. The direct change method is to increase the cross section size of the product, but it will also lead to the increase in the structure of the product.

6. Permanent deformation performance of hydraulic seal material

The pressure of working medium is the main factor causing permanent deformation of hydraulic seals. The working pressure of modern hydraulic equipment is increasing day by day. The long-term high-pressure action will cause permanent deformation of the seal ring. Therefore, appropriate pressure resistant rubber materials shall be selected according to the working pressure during design. The higher the working pressure, the higher the hardness and high pressure resistance of the materials used.