Why Encapsulated O-rings??

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In the business of O-rings, it has been done the same way for so many years with the jointing of standard elastomeric O-rings. A simple glue to an O-ring and then it is used within the applications. So many times I have heard from customers about how their O-rings have become defective in their application.  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 temperature. There are several problems people will face when using this specific type of O-ring:

  • 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.
  • PROBLEM 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.

The ROW advantage not only allows us to provide high quality O-rings in Silicone, Viton or EPDM, but we can also custom-make our O-rings to meet your specified dimensions. 

Don't wait and reach out to ROW, Inc. today for more information and a quote!