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Static Seals

A static condition exists in a sealing application when there is little or no motion of the mating assembly parts upon the seal itself. This type of seal typically has only an initial compression (the sealing of a hose joint), or periodic compressions caused from opening and closing (door seal in a house).

Dynamic Seals

Dynamic conditions exist when the seal experiences repeated motions against it in a circumferential, axial or angular direction. Typical seals in dynamic applications that experience repeated motions include piston ring seals and shock absorption seals.

Because of the repeated changing in stress levels, design considerations for dynamic sealing are often more complex than those of static seals. In addition to the static environment considerations, dynamic seals environments may require:

• Temperature changes or thermal cycles
• High tensile strength or tear resistance
• The ability to recover from distortions — being squeezed or stretched
• Recovery speed after compression
• Compression set parameters
• Abrasion resistance