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Teflon Encapsulated O-Rings



FACT 1: Most manufacturers of encapsulated O-Rings use CYANOACRYLATE (quick glue) to join the ends of the Viton™ cord instead of vulcanizing with a fully curable fluorocarbon based adhesive. The glued joint is inferior to a vulcanized joint at elevated temperatures.

PROBLEM A: Introducing a foreign material, cyanoacrylate, may cause contamination thru permeation of the FEP or PFA jacket.

PROBLEM B: Certain chemicals, thru permeation, will attack and break down the glue, causing premature seal failure.

Competitor's Split Teflon Encapsulated O-RingsPROBLEM C: The quick glue bond is dramatically weakened during a rise in temperature and breaks down completely nearing 400°F; whereby the elastomer shrinks and the joint separates leaving a gap between the ends of the Viton™ cord.

PROBLEM D: When heating and stretching a glued O-Ring to fit over a shaft, the bond may break.

SOLUTION: Insist on ROW, Inc. TFE-O-SIL® vulcanized encapsulated O-Rings! Ask your supplier what method they use to join the ends of their Viton™ encapsulated O-Rings...or simply run your own test by placing the O-Ring in an oven at 350°F for only 15 minutes. It will be clearly visible that the splice has completely separated, creating a gap or potential leak path.

FACT 2: Occasionally, encapsulated O-Rings will exhibit an AIR GAP of .005" - .010" between the elastomer core and the jacket.

PROBLEM A: The air gap allows considerably more compression set and reduces the resilience of the encapsulated O-Ring, resulting in premature leakage.

SOLUTION: Run compression tests to compare TFE-O-SIL encapsulated O-Rings with other supplier O-Rings...or specify ROW TFE-O-SIL O-Rings which have no air gap.

Design Recommendation Disclaimer:
Recommendations on application design and material selection are based upon available technical data and are offered as suggestions only. Each user should conduct evaluations to determine the suitability for his particular application. ROW, Inc. offers no express or implied warranties concerning the form, fit, or function of a product in any application.

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