USP Class VI O RingsUSP Class VI O Rings from ROW INC. ROW, Inc. manufactures standard and custom size o-rings compliant to the U.S. Pharmacopoeia (USP) Class VI requirements. USP Class VI compliant compounds are formulated with ingredients providing certifiable biocompatibility and low extractables for system toxicity and purity. USP Class VI materials are available in 70 durometer EPDM, Silicone, and Viton.
Why Choose Us for USP Class VI O Rings
NOT ALL USP CLASS VI 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.
First Potential Problem Introducing a foreign material, cyanoacrylate, may cause contamination thru permeation of the FEP or PFA jacket.
Second Potential Problem Certain chemicals, thru permeation, will attack and break down the glue, causing premature seal failure.
Third Potential Problem 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.
Fourth Potential Problem 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 USP Class VI 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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