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TFE28 PTFE glass cloth Teflon tape roll
October 26, 2026

Teflon Tape Explained: Glass Cloth vs. Skived PTFE, and How to Choose

"Teflon tape" is one name that covers at least three very different products. There is the thin white tape plumbers wrap around pipe threads. There is the tan woven tape living on heat sealer bars. And there is the slippery pure film wrapped around rollers and chutes. All three are PTFE. Almost everything else about them is different, and buying one when you need another is a common and avoidable mistake.

This guide explains the industrial types, glass cloth and skived PTFE, how they are made, where each one belongs, and how to pick a thickness. Specs quoted come from our product pages, which note they are manufacturer specs and are not tested for accuracy.

Start here: Shop the PTFE Teflon Tape collection | Request a free sample

First, the Name

Teflon is a brand name for PTFE (polytetrafluoroethylene), the non-stick, heat-resistant, chemically inert plastic. Industrial tapes are sold by construction, not by the brand name, so it helps to shop by what the tape is made of: a woven fiberglass cloth coated with PTFE, a solid film of pure PTFE, or a non-adhesive thread seal tape. The adhesive matters too. The industrial tapes in this guide use high-temperature silicone adhesive and run from -100°F to 500°F.

Type 1: PTFE Glass Cloth Tape

Glass cloth tape starts as woven fiberglass fabric, warp and fill yarns like a textile. The cloth is impregnated with PTFE and coated with silicone adhesive. The cloth gives it dimensional stability and serious breaking strength. The PTFE surface gives it release, low friction, and chemical resistance. This is the workhorse for flat, hot, abrasive jobs.

It is sold three ways:

  • With liner (WL): a release liner protects the adhesive, which helps with precise placement, die cutting, and large surfaces
  • Self wound (SW): no liner, wound on itself, faster for wrapping and maintenance. The 1/2 inch and 3/4 inch widths come self wound
  • Without adhesive (NA): the coated fabric alone, for release sheets, covers, curtains, and gaskets that get fastened in place
Model Total thickness Adhesion Breaking strength (warp) Best for
TFE28 5 mil 43 oz/in 100 lb/in Vacuum sealers, heat sealing bars, electrical insulation
TFE46 6.8 mil 36 oz/in 135 lb/in General heat sealing and insulating work
TFE54 8.4 mil 40 oz/in 150 lb/in Chute liners, guide rails, heavier wear
TFE91 12.1 mil 60 oz/in 290 lb/in Gaskets, roll covers, the heaviest wear

TFE54 PTFE glass cloth tape rollShop TFE54 glass cloth tape

Type 2: Skived PTFE Film Tape

Skived tape is pure PTFE with no cloth inside. A solid billet of PTFE is shaved into a thin film, then coated with silicone adhesive and wound on itself without a liner. Without the woven backing, the film stretches and conforms: it wraps tight bends, irregular shapes, wires, and rollers in a way glass cloth cannot. The trade is raw strength and stability, which is why the two types are not interchangeable.

Model Film thickness Elongation Dielectric strength Best for
SPTFE2HD 2 mil (3.5 mil total) 147% 3,414 V/mil Electrical wraps, coil separators, transformers, slot liners
SPTFE5 5 mil (7.2 mil total) 200% 12,000 V Heat sealing jaws, pressure pads, rollers, mold release
SPTFE10 10 mil (11.5 mil total) 300% 20,000 V Heavy mechanical wear, bearing surfaces, roll protection

The 2 mil grade is a high-density tensilized film, stronger and less stretchy than standard skived film, which is why it is the electrical pick. The thicker grades trade a little dielectric rating per mil for a lot more wear life and conformability.

SPTFE5 skived PTFE tape rollShop SPTFE5 skived PTFE tape

And the Plumber's Tape Is a Different Animal

PTFE thread seal tape (PTST35) has no adhesive at all. It is a thin 4 mil PTFE film you stretch and wrap around pipe threads, where it lubricates the fitting and fills the thread gaps for a leak-tight seal, up to 2,000 psi. It comes in standard density (about 0.26 g/cm3, for everyday plumbing) and high density (about 0.36 g/cm3, more PTFE per wrap for industrial and higher-pressure work), and it meets spec A-A-58092. Never substitute it for an adhesive PTFE tape on a machine, and never use machine tape on a pipe thread.

How to Choose Between Glass Cloth and Skived

  • Flat surface, heat, and abrasion: glass cloth. Sealer bars, chutes, rails, and covers are its home ground
  • Curves, wraps, and irregular shapes: skived film. Its elongation lets it hug the part instead of bridging over it
  • Electrical insulation: both work. Glass cloth for flat insulation, SPTFE2HD for wraps, coils, and slot liners
  • Thickness: go thicker for wear life, thinner for conformability and faster heat transfer. Match the thickness you are replacing before you experiment
  • Release and low friction: both release well. Skived film has the slicker, more uniform surface for roll wrapping and web handling

Try It First: Request a Free Sample

Not sure which construction your application needs? Request a free sample and test it on the actual surface before you commit.

Go to Request A FREE Sample, enter the SKU of the product you want to test, add it to cart, and check out. Samples are free, but shipping is not included. Samples are for testing purposes, up to 4 inches wide and about 10 to 15 feet long.

Get started: Request your free sample here

Complete Your Kit

Questions? Talk to Our Team

Learn more about Tape Providers, check our FAQ and shipping information, or contact us and describe the surface and the temperature, and we will point you at the right construction. You can also reach us on our contact page.

Final Thoughts

PTFE is the material. The construction is the decision. Glass cloth when the surface is flat, hot, and abrasive. Skived film when the part curves, wraps, or needs to slide. Thread seal only on threads. Pick by construction first and thickness second, and Teflon tape stops being confusing.

If you are unsure which type fits your application, our team can help you pick the right option.

Contact Tape Providers for product recommendations and technical support.

Ready to start? Shop PTFE Teflon Tape | Request a free sample

Teflon is a trademark of its respective owner. References are provided for product selection purposes only.

Filed in: glass cloth tape, PTFE, skived PTFE, Teflon tape, thread seal tape
Previous article PTFE Tape on Heat Sealers: How to Choose It, Apply It, and Know When to Replace It
Next article 3M Is Phasing Out Its PTFE Tapes in 2026: What to Use Instead

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