Merco Tape Threadmaster Threadseal Tape with Nickel - M77Ni
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M77Ni- Threadmaster® DOMESTIC  PTFE TAPE - FULL DENSITY 1.55g/cm3 with Nickel

MERCO M77Ni Threadmaster®
Meets Mil Spec A-A 58092  *

Merco Threadmaster® M77Ni PTFE Sealant Tape is for those applications that require the sealing  properties of a premium grade thread sealant, with Nickel. This thread sealant is intended to be used for critical applications sealing in Stainless Steel pipe threads for liquid and gaseous systems, other than oxygen. The nickel prevents galling, common with Stainless.

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. in addition to Stainless, M77Ni is suitable for use with Galvanized, Iron, Brass, Copper, Aluminum, PVC, ABS and more.

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 full density PTFE thread sealant tape is virtually chemically inert, non-toxic and nonflammable. It will not harden and requires no curing time. 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, UL® Listed thread sealant 561R, and is Made in the USA. Its 10 years shelf life ** allows prewrapping and storage of threaded parts.





other COLORS:




.0037" to .0043"



1.55 g/cm3



exceed 1,000 psi



exceed 100 psi



75% minimum



Plastic spool & shell



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


MSDS available

MSDS for M77, M78, M78Ni


Chemical Compatibility

see here


What do the stars and caveats mean?

* Technically, Nickel Based PTFE Threadseal Tape does NOT meet Mil Spec A-A 58092. Not Merco's, not anyone's.  Why? Because that spec calls for "tape (that) shall be at least 99 percent polytetrafluoroethylene"  Nickel based Threadseal Tape is approximately 2% nickel, 98% PTFE. The 2% is not enough to degrade the performance of the threadseal tape at all. And it is the only solution for preventing galling in stainless. Hopefully the Procurement people will address this at the next spec revision. Until then, you are just going to have to be out of compliance.

** This one is better news. Because almost all tape specifications call for a shelf life of some sort, industry practice is to use 10 years for Threadseal tape. However, Polytetrafluoroethylene will be around almost forever. It just doesn't break down. While this is a good news for engineers and technicians, it probably has some Green Peace types planning a picketing of our facilities soon. Like dinosaurs in the form of plastics (petroleum products) and frying pans coated with DuPont® Teflon® non-stick film, PTFE in any form will be here for a long, long time.

Merco Threadmaster M77 Nickel Threadseal Tape

*** 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.

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

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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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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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