Hydraulic oil on the performance of the seal

Regardless of what kind of material, should have the following properties:
1, with some mechanical and physical properties: such as tensile strength, elongation strength, elongation;
2, there is a certain degree of flexibility, hardness fit and compression set;
3, the working media, not prone to swelling, decomposition, hardening;
4, wear, there are some anti-tear properties;
5, high temperature, low temperature aging.
However, there is no sealing materials include all of the above properties, the need to work environment, such as temperature, pressure, media and sport mode to select the suitable sealing material, and through the development of materials with recipe to meet certain requirements. Or the use of composite materials or a combination of two or more structures in the form of play to their strengths, to achieve more comprehensive results.
Seal formation: dynamic security seal is divided into non-contact seals and contact seals. Non-contact seal mainly a variety of mechanical seals, such as: graphite packing ring, floating ring seals; rubber composite seals and rubber seals belong portfolio contact seals, relying on filling in a sealed chamber in the pre-compression force, leakage channel blocking sealing effect is obtained. Seals used in hydraulic systems are mostly static seal (seal), reciprocating seals (piston, piston rod seal) and rotating Meter seal.
Factors affecting the sealing effect: seal structure selection and film formation, pressure, temperature, material compatibility, dynamic sealing contact with the working surface of the material, hardness, geometry, surface finish.