In a dynamic application, the O-ring seal moves. In a static application, the O-ring seal does not move.
The type of movement can also be divided into rotational and translational movements.
Rotatory: Rotating movement (example: shaft)
Translational: Back and forth movement (example: hydraulic cylinder)
Important: When designing a dynamic O-ring, the higher load must be taken into account. As the O-ring is constantly in motion, it is exposed to significantly higher friction.