Merco Tape Threadmaster Threadseal Tape M 77
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M77- Threadmaster® DOMESTIC PTFE TAPE - FULL DENSITY 1.55g/cm3

MERCO M77 Threadmaster® Meets Mil Spec A-A 58092

Merco Threadmaster® PTFE Sealant Tape is for those applications that require the sealing  properties of a premium grade thread sealant. This thread sealant is intended to be used for critical application sealing in pipe threads for liquid and gaseous oxygen systems.

This premium Grade Full density PTFE sealant tape permits quick, clean economical sealing of male pipe threads of all sizes and reduces the risk of system contamination common with liquid and paste sealants. Ideal for applications involving fluids and gases, including Plumbing, Science and Laboratory, Manufacturing, Aerospace, Technologies and  other critical applications.

The Self-lubricating quality of this unsintered PTFE (polytetrafluoroethylene) tape makes joints easy to assemble and disassemble, and extends the fatigue life of the sealed connection.

Totally maintenance free premium grade medium density PTFE thread sealant tape is virtually chemically inert, non-toxic and nonflammable. It will withstand temperatures from –450F to 550F (265C), and pressures from a hard vacuum to 10,000 psi. with the adequate system. This superior tape complies with requirements of MIL-T-27330A and MIL-A-A-58092 and is Made in the USA. Its 10 years shelf life allows prewrapping and storage of threaded parts.

    SPECIFICATION              ASTM Method



other COLORS:

Yellow, Pink, Green, Gray




1.55 g/cm3


exceed 1,000 psi




Plastic spool & shell


Made in the USA
meets Mil Spec A-A-58092

MSDS available

MSDS for M77, M78, M78Ni

Chemical Compatibility

see here

Looking for Stainless PTFE Threadseal?  Check out this specification page.

The original PTFE resin was invented by DuPont in 1938 and called Teflon®. While all Teflon® is PTFE, not all PTFE is Teflon®. As stated in a letter from the DuPont Legal Department, DuPont does not license the manufacture of ANY Teflon® film into ANY PTFE Thread Seal Tape, i.e. there is no thread seal product authorized to be licensed to be made with Teflon® brand PTFE. In fact, they maintain there is NO such thing as Teflon® Tape. Please see the link for this unusual marketing position and, a copy of the letter from their trade marks department is available on request. This should be of little concern to the user however. As explained elsewhere on our site, it isn't the BRAND of PTFE that is important but the density. Virtually all PTFE from quality chemical houses are identical in performance.
Threadmaster® is a registered trademark of Merco Company

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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