Outgassing and Permeation

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Outgassing and PermeationElastomers for Vacuum! Viton has best mechanicalproperties, bakeability (to 180C),with low permeation and lowvolatility.! Buna N (Nitrile) lower cost thanviton with same benefits exceptpoorer bakeout resistance.Post-Curing Elastomer O-rings! Manufacturers of Viton o-ringsdon’t know where there productis going.! If base pressure is an issue, postcure in air oven at 140C for 48h,or purchase from vendor postcured.! Vendor: www.uccomponents.com6
Outgassing and PermeationAlternative Elastomers! FFKM materials (Kalrez 8575,Chemraz 630) are expensive,chemistry resistant but havehigher permeation rates thanViton! MFQ materials often have selectchemical resistance, but highpermeation rates.Outgassing and surfaceroughnessA high quality surface finish is oftenequated with a low outgassing rate.Effective surface area is reducedwhen high quality surface finishesare employed, but this influence isnot profound.Surface finish usually does not drivefabrication costs in small vessels,but frequently does in large.7
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Outgassing and Permeation

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