With higher squeeze also comes more friction and faster wear in dynamic applications. If you increase the squeeze, and its compressive force, too much you can potentially damage mating hardware, depending on the materials and the design of the hardware. Beyond a certain level, however, other factors intervene that can work against an effective seal, such as the stress the force causes on mating hardware. There are a number of factors to consider, which include:Īs just noted, tighter seals generally result from higher levels of squeeze. But that doesn’t necessarily mean that designers should always specify the most squeeze (assuming they knew what that level was or why it was “the most”). The greater the squeeze, the more force is applied against the hardware and the tighter the seal.
This contact force blocks the passage of liquids, gases and dry powders, preventing them from flowing between the rubber seal and the mating hardware. Deforming the seal cross-section “energizes” the elastomer matrix much like compressing a spring the inherent elasticity of the rubber material causes it to push back against the mating components. Squeeze is a ratio of the amount of deformation applied to the seal expressed as a percentage of the free-state cross-sectional thickness. One of the decisions equipment designers need to make when installing O-ring seals in their applications is how much the O-ring will be squeezed by its mating hardware to create an effective seal. Original content can be found on Parker’s Blog. Article re-posted with permission from Parker Hannifin Sealing & Shielding Team.
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