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Encapsulated O Rings Telfon, Silicone and Viton Encapsulated O-Rings with FEP or PFA are designed to address the growing problem of sealing in the most hostile chemical and temperature environments. TFE-O-SIL combines the best qualities of two materials, FEP or PFA on the outside with its chemical inertness and an elastomer on the inside for resilience. This unique combination forms a highly effective, long lasting seal for the most demanding applications.Encapsulated O-Rings are available in over 60 standard O-Ring sizes from .063" (1.60mm) to 1-1/4" (31.75mm). Standard TFE-O-SIL O-Rings are comprised of FEP over silicone, Viton®, or EPDM, and can be used in temperatures from -75° to +400°F (-60° to +205°C) depending upon the choice of elastomer core. For high temperature applications to 500°F (260°C), TFE-O-SIL is made with PFA over silicone. PFA has higher mechanical strength than FEP or TFE at elevated temperatures and has excellent crack and stress resistance. Teflon encapsulated O-Rings are primarily used as a static seal (axial or radial). Why ROW For O RingsNOT ALL TEFLON ENCAPSULATED O-RINGS ARE OF EQUAL QUALITY AND PERFORMANCE ABILITIES EVEN THOUGH THEY MAY LOOK ALIKE! 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.
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. |
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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.
