Tefcan Universal Joint Sealant

What is Tefcan®- Universal Joint Sealant?

Expanded PTFE in cord form with a self-adhesive backing strip for ease of installation. It is a superior and cost-effective alternative to standard gasket sheeting. Ideal for complex or large gaskets and for resealing damaged, worn or distorted flanges.

Tefcan® Universal Joint Sealant is supplied in a continuous cord with an adhesive back. Made from 100% expanded PTFE, it is highly compressible with excellent sealability. This unique sealant conforms to irregular shapes and surfaces. Compressing into a thin, wide ribbon, it produces a tough, long-lasting gasket, sealing against extreme temperatures, pressures and corrosive media.

What are the core advantages of Tefcan®- Universal Joint Sealant?

Superior Performance

The exceptional properties of PTFE, combined with the unique nature of its own expanded form, contribute to the long life of seals made with this sealant. PTFE is unaffected by virtually any chemicals and corrosive environments. Tefcan® Universal Joint Sealant will not contaminate flow products, nor deteriorate through time.

The structural integrity of this material under compression allows for its use from -240ºC to +310ºC, under pressures from a vacuum up to 3,000 psi, against virtually all media. Non-brittle even when very cold at cryogenic extremes, Tefcan® Universal Joint Sealant is a cost-effective, superior alternative to special sealants typically specified for cryogenic applications. Unlike conventional, non-expanded PTFE, it does not exhibit cold flow problems under sustained loads.

The result is a very thin, wide contour-hugging gasket with minimal area exposed to the enclosed media. Once bolted up, Tefcan® joints remain leak tight and rarely need to be retorqued, and so troubleshooting is simplified.

Easy to Install

Tefcan® Universal Joint Sealant is designed to be easy to use and install, reducing time and labour costs. It requires only a minimum of flange preparation and is readily held in position on vertical, overhead or awkward surfaces by its self-adhesive strip.

Tefcan® Universal Joint Sealant is so soft and flexible, that it easily follows irregular surfaces, turns corners and pushes into narrow openings. The cord’s great pliability, allows it to quickly be formed into complex shapes. A seal is completed by simply crossing the two ends, preferably in line with a bolt hole.

Minimises Downtime

Replacement gaskets using Tefcan® Universal Joint Sealant are immediately available, meaning no delay while conventional gaskets are cut and they are also stronger and longer lasting. It can be swiftly formed into any shape and requires relatively low bolting pressures.

Tefcan® Universal Joint Sealant will not cause pitting of flanges and peels off after use. Gasket sealing therefore is simplified, faster and enhanced. As a result, periods between maintenance can be extended and actual down time is reduced.

Reduces Inventory

Your entire gasketing stock can usually be replaced with just four cord sizes from across the range, to seal any gasket application on your plant. Compact in size with unlimited shelf life, the cost of this specific sealant is low and inventory savings on custom-made gaskets, such as ‘O’-rings and envelopes, can be substantial. This sealant will even seal large diameters for which, costly and jointed conventional gaskets are difficult to cut, transport, stock, handle and install.

Size Selection

As Tefcan® universal joint sealant compresses to form a thin, wide gasket taking up surface flaws, size selection is usually not critical. However, the following guidelines will help you obtain maximum results from this sealant for most applications. For general flange surfaces, select a size of joint sealant with a nominal width diameter (d) of approximately 1/3 of gasket contact area (W). The gasket contact area (W) is the distance from the ID of flange surface to the inside of the bolt hole, not the full flange.

For rough surfaces, select a size with a nominal width (D) that is approximately 1/2 of the gasket contact area (W). On scored surfaces, overlap sealant at the location of the score, or lay in an extra piece to double-up the material. For flanges with narrow gasket contact surfaces, especially 7mm and below, a full width gasket can normally be used, if desired.

Styled Table
Normal Size Spool Length (m)
Width (mm) Width (inch) Thickness (mm) Spool Length (m)
3.0 1/8 1.5 30
5.0 3/16 2.0 25
7.0 1/4 2.5 15
10.0 3/8 3.0 10
14.0 1/2 5.0 5
17.0 5/8 6.0 5
20.0 3/4 7.0 5

Styled Data Table
Nominal Width Compressed Thickness (Imperial) Recommended Clamping Force per Length of Seal (lb/inch)
mm Inch Water Tight (1) Gas Tight (2) Water Tight (1) Gas Tight (2) Rough Surfaces Gas Tight (3)
3 1/8 0.015” 0.010” 250 500 No Seal
5 3/16 0.019” 0.015” 250 850 No Seal
7 1/4 0.023” 0.018” 275 1150 2500
10 3/8 0.038” 0.023” 275 1500 2650
14 1/2 0.050” 0.030” 275 1550 2850
17 5/8 0.066” 0.040” 300 1650 2850
20 3/4 0.100” 0.050” 300 1950 2900

Note: Water at 300 psi internal pressure

Note: Gas at 600 psi internal pressure

Note: Gas at 600 psi internal pressure where surface flaws are deeper than 80 micron

Get in Touch

Email

Reach us at
contact@vulcanseals.com

Phone

Call us at
+44 (0) 114 249 3333

Office

Vulcan Seals
The South West Centre, Troutbeck Road, S8 0JR, Sheffield, UK
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