o-rings and seals

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Home > O-ring, Seal Design > Vacuums > Trapped Gas

Trapped Gas in O-Rings and Seals

Trapped gasThe release of gas trapped by the elastomer in the groove (especially dovetail grooves) can slowly leak over time.

Comparisons of sealing materials and design alternatives are often made by charting the pump-down curve. Recording of temperature and pressure (vacuum) levels over time can provide useful information to equipment manufacturers.

Recent testing by a major vacuum components manufacturer confirmed that there were "no appreciable difference[s] in the permeation rates (increase in helium partial pressure) for brown or black Viton."*

Vacuum grease may not provide a significant reduction in permeation, but may improve the seal installation and repeated sealing performance.*

perfluoroelastomer pump-down curves

trapped gas

* Nor-Cal Products, Permeation of Various O-Rings, 1998

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