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INERTEX® UHF Joint Sealant

INERTEX® UHF Joint Sealant looks and feels different from other Joint Sealant products.It is smooth and flexIble with an exceptionally uniform texture and density. Under the surface is a microscopic structure that makes this remarkable material the strongest, most versatile sealant available today.

INERTEX® UHF Joint Sealant is made of 100% expanded virgin PTFE. INERTEX® alone usesa patented processt hat produces a uniform and highly fibrillated microstructure with thousands of small fibers running in many directions. These create a soft and pliable, yet very tough oval-shaped joint sealant that is very compressible with a high tensile strength. INERTEX® UHF Joint Sealant provides excellent cold flow and creep relaxation resistance. It is FDA suitable and it comesw ith an easyp eel off selfadhesive backing that makes installation simple.


  1. Choose INERTEX® UHF Joint Sealant that is approximately 1/3 to 1/2 the width of the sealing surface.
  2. Peel off the adhesive backing and apply it around the flange inside the bolt circle.
  3. Overlap ends about 3/4" at a bolt hole.
  4. Follow standard torquing sequence to tighten.
  • 100% expanded virgin PTFE
  • Withstands a wide range of temperatures from –4500°F to + 6000°F
  • Unaffected by common chemicals, pH range, 0-14
  • Non-contaminating, non-toxic
  • FDA suitable (FDA 21 CRR177.1550)
  • Will not age or harden in service
  • Extremely strong; pressure range from full vacuum to 3000 PSI

INERTECH manufactures a full line of advanced sealing products including Gasket Sheet, Gasket Tape, Joint Sealant, Valve Stem Packing, Thread Tape and EZ-Seal Insertable Gaskets. For assistance with custom applications or for more information, consult your INERTEX® distributor.


INERTEX® UHF Joint Sealant can be ordered in a wide variety of sizes and lengths. All sizes with the exception of IMM include an easy peel, self-adhesiveb acking. Custom sizesa nd shapes are available for special applications. Consult your INERTEX® distributor about custom INERTEX® products.

Standard Sizes Size Selection Reference
Size Standard Length (ft/spool) 150-300 lb ANSI Flangers Use this size
1 MM 100,1000 1/2" - 3/4" 1/8"
1/8" 100,1000 1" - 1-1/2" 3/16"
3/16" 75,750 2" - 3-1/2" 1/4"
1/4" 5, 100, 500 4"-6" 3/8"
3/8" 25,50,250 8"-16" 1/2"
1/2" 15, 30, 150 18"-20" 5/8"
5/8" 15,30,150 24"-36" 3/4"
3/4" 15, 30, 50, 100 30"-60" 1"
1" 15, 30, 75 60"- HIGHER 2"
2" 39
Non Standard or SPecial Size Flangers
Sealing Width Use this Size
1/8" - 1/4" 1/8"
5/16" - 3/8" 3/16"
7/16" - 5/8" 1/4"
3/4" - 1" 3/8"
1-1/8" - 1-1/2" 1/2"
1-5/8" - 2" 5/8"
2" - 2-1/2" 3/4"
2-1/2" - 3" 1"
3" - higher 2"


General Information

INERTEX® UHF Joint Sealant, UHF EZ Seal Insertable Gaskets, and SQ-S sheet gasketing material are expanded PTFE (Teflon) products made from 100% virgin PTFE (Polytetrafluoroethylene). INERTEX® products are produced via a unique process, protected under U.S. patent #5,098,625 (see patent within booklet).

Our UHF process generates a Uniformly and Highly Fibrillated microstructure. This high ratio of the fibrillation results in millions of interlocking fibrils which provides significantly LESS CREEP and COLD FLOW characteristics than other expanded PTFE products. INERTEX® products are more dense, are more easily compressed with less clamping force, and fill flange surface irregularities more easily than other gasketing products.

Under compression INERTEX® products form an extremely strong inner structure which translates into high retention of bolt load with a tighter sealing gasket. This provides the user with lower emissions at every gasketed joint.

Because it is a formed-in-place gasket, INERTEX® UHF Joint Sealant is ideally suited for large diameter applications such as pressure vessels, tank lids, heat exchangers, manholes, and can also be used to form gaskets for any irregularly shaped equipment configuration.

INERTEX® UHF EZ Seal Insertable Gaskets are preformed rigid insertable gaskets which fit all standard ANSI Flanges 150# and 300# class. All properties and information defined in the following data for INERTEX® UHF Joint Sealant are applicable to INERTEX® UHF EZ Seal Insertable Gaskets.

INERTEX® SQ-S Sheet Gasket material is the largest expanded PTFE sheet in the world at 77” x 77” in either 1/16” or 1/8” thickness. It is easily hand cut or die cut. Please refer to the separate test data section for standard ASTM testing results.

Due to the characteristics of 100% Virgin PTFE, all INERTEX® products are completely unaffected by all common chemicals, do not deteriorate with age, will not contaminate flow media and will not leave a residue on the sealing surface when removed.

Operating Parameters

Temperature Range
-450°F to +600o F
Pressure Range
Full vacuum to 3000 PSI
Chemical Compatibility
Fully compatible throughout the pH range of 0 to 14! Affected only by elemental Fluorine and molten alkali metals.
Oxygen Service Limits
Oxygen index of 94.5% (PRODUCT MUST BE ORDERED WITHOUT ADHESIVE STRIP) (PTFE will burn in 100% oxygen atmosphere when ignition source is provided)
FDA Suitable
FDA 21CFR 177.1550

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