What is Self Fusing Tape and How Does It Work?

Date: 20/08/26

When you are working in tight spaces, trying to create a watertight or electrically safe repair under pressure, self fusing tape is exactly what you need. No mess, no tape sticking to your fingers or folding on itself, just a quick, clean, permanent repair you can count on.

Self fusing tape is an adhesive-free silicone rubber tape that creates a strong and lasting bond with itself. It can be used in plumbing and electrical repairs, creating an instant seal that only gets stronger over the next 24 hours. 

It sounds like magic, but self fusing tape is actually just a very smart use of materials science. 

How Does Self Fusing Tape Work?

Self fusing tape doesn’t need an adhesive, because it chemically and physically bonds through polymer science. It’s often described as ‘sticking to itself’, but in fact the two layers of tape don’t stick to each other at all; they meld together to become one single layer. 

That’s why the bond is so strong: there are no longer two separate pieces of tape to pull apart, just one solid silicone rubber layer.

How self -using tape works:

• Stretch the tape – to start the process, you need to stretch the tape to two or three times its original length. This activates the polymers by placing them under tension.

• Overlap the layers – when the layers are overlapped and pressed together, the polymer chains on each surface intermingle with the polymers on the other, and the separateness of the two surfaces disappears into one. This is called polymer-chain diffusion and cross-linking.

• Leave for 24 hours – the initial bond is strong and watertight, but over the next 24 hours, polymers will continue to intermingle, making the bond even stronger and more permanent. 

What are the benefits of adhesive-free tape?

We’ve all been there… struggling to find the stuck-down end of the tape roll before you can even start, then struggling again as it seems to stick to everything – itself, your fingers, your tools – everything except the repair you need it to stick to. 

Even when you do complete a repair with traditional tape, it’s often not long before the ends start to peel back as heat, moisture and oils penetrate the adhesive and break it down. And when you come to replace it, you’re left with a sticky residue on the pipes or wires that simply refuses to budge.

The benefits of self fusing tape mean that you don’t have to put up with any of these problems. Self fusing tape is easy to work with because:

• It comes with a plastic backing so it unrolls easily

• It contains no adhesive, so it won’t stick to anything except itself

• It forms a permanent bond that is waterproof and hard (40 ± 10 Shore A)

• It is thermally stable from -45°C to 200°C 80°C (and short-term extremes of 260°C)

• It has ‘excellent’ UV, electrical and ozone resistance, ‘good’ flame and solvent resistance, and ‘good/fair’ resistance to acid, oil and hydrocarbons

• It leaves no residue when removed 

If you want more details, check out our 369 Self-Fusing silicone tape data sheet for the full technical specs.

What is self fusing tape used for?

As you can imagine, a tape as easy to work with and as practical as self fusing tape has endless uses in electrical work, plumbing, automotive and marine, as well as many other areas. Take a look at our blog ‘Top 10 uses for self fusing tape’ to see just a few of the many reasons why it should be in every toolbox for every job.

Say goodbye to sticky tape

Say goodbye to the frustrations of traditional tape, and start creating strong, simple repairs in seconds with 369 Self-fusing Silicone Tape from Sleeve It. It’s just part of our extensive range.

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