Viscosity

The resistance of a material to flow under stress.

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Voids

The absence of material, or an area devoid of materials where not intended

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Volume Change

A change in the volume of a seal as a result of immersion into a fluid, expressed as a percentage of the original volume.

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Volume Swell

Increase in physical size caused by the swelling action of a liquid.

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Vulcanization

A process involving the use of heat and pressure, resulting in a permanent chemical change, giving greatly increased strength and elasticity of rubber materials.

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Weathering

The detrimental effect upon a material after outdoor exposure. For example surface cracks on an O ring after exposure to ozone.

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