Merco Tape: Teflon Brand Chemical Compatibility
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This chart is pretty self explanatory. It's from DuPont's technical people, so please understand our caveat printed below and on our literature: Make Sure You Understand the Properties of What You Are Using As We Make No Warrantee of Suitability.

According to DuPont's legal department, there is NO thread seal tape on the planet authorized to be made with DuPont Brand PTFE. A copy of this letter is available upon request. However, this should be of little concern as the underlying properties of all PTFE films manufactured by a quality chemical house are the same. If your PTFE film is from a quality house (as it is when you buy Merco brand Threadseal Tape) than your PTFE product will perform as well as any other. PTFE is PTFE.

The main factor determining suitability for use is the density of the grade you are using, i.e., how much air is in your film. Does your present supplier specify the specific gravity of their product? We do.

For a fuller listing and more discussions, please see:
                        Teflon® PTFE Fluoropolymer Resin, Properties Handbook, DuPont Co., July 1996
                        Teflon® Fluorocarbon Resin, Performance Guide for the Chemical Processing Industry, DuPont,                                               Technical Bulletin No. E-21623-3
                        Exploring the Chemical Resistance of Teflon® Resins, the Journal of Teflon® 3(9), Nov-Dec 1962
                        Teflon® FEP Fluoropolymer Resin, Properties Handbook, DuPont Co., pub No. H-37052-3, Jan 1998
                        "Teflon Tape"? Its not what you may think.  DuPont web page

DuPont's Chemical Compatiblity Chart for Teflon brand PTFE

A word or two about pressure ratings:

The pressure comment on the spool label of our (Domestic) products is specific to the test performed by Underwriters Laboratories (UL) in the certification of our products.  All PTFE thread seal tapes, regardless of manufacturer, which are submitted to UL for certification are subject to their uniform test at 100 psi.  If we produce a product labeled with their certification, we have to include that paragraph at the bottom of the label which includes the 100 psi statement.

That does not mean our tapes cannot exceed 100 psi, in fact they generally do, One Hundred PSI is just the extent of the UL test and their required labeling.

All our Domestic products are 100% virgin PTFE, they do not contain any fillers or reprocessed materials, and are frequently used in systems where pressures exceed 10,000 psi.  We cannot certify to this level because we do not control the other components in the system or the assembly process.  But as a rule, our tapes, when properly used, will meet or exceed the minimum pressure rating of the components they are used with.

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Merco Hackensack, Inc
P.O.Box 875, 201 Route 59  Hillburn, NY 10931
Phone:  845-357-3699 Fax: 845-357-3677

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Contents copyright Merco Tape/Merco Hackensack, Inc, 1995-2013. All rights reserved. No part of this site may be used without prior permission.
All  statements, technical information and recommendations contained on this site, or  in any of our literature, are based upon research and experience which we  believe to be reliable, but such information or recommendations shall not  constitute a warrantee of suitability. Determination of final qualifications for  any particular use rests solely with the ultimate end user.

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