10 Questions You Should to Know about automotive insulation tape

10, Mar. 2025

 

How and when to use insulating tape - ACIT srl

How can you use insulating tape? How should you apply it for proper insulation? These rolls of colourful tape undoubtedly appear in the top five tools used daily by electricians, together with screwdrivers, pliers, and scissors.

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They are, therefore, pretty common-use tools, which are rarely missing in household toolboxes of people who are at least a little bit of manual skill.

Nevertheless, many people do not know how to use insulating tape correctly, and this is an issue: using insulating tape incorrectly can in fact lead to dangerous consequences, or at least the malfunction of an electrical set-up or an electrical device.

So, let's have a look at how to use insulating tape to insulate electrical wires without any mistakes.

What is insulating tape?

Insulating tape is, in effect, an adhesive tape. It is in fact a roll of tape that is adhesive on one side and smooth on the other.

To distinguish insulating tape from the simple tape, as well as other adhesives such as paper tape or American duct tape, is its ability to isolate objects which have current passing through them.

It is therefore not surprising that insulation tape is made of materials with an extremely low conductivity, such as PVC. Thanks to these materials, it is therefore possible to insulate electrical wires using only a minimum amount of thickness, corresponding to a few tenths of a millimetre.

There are several types of insulating tape on the market, as well as, of course, within our very own professional adhesive tape online store: the best ones are those made with high quality PVC and which are self-extinguishing.

They can also differ in width and length (insulating tape is, generally speaking 15, 20 or 25 mm (0.5, 0.7, 0.9 in) wide, with individual rolls 10 to 25 m (32.8, 82 ft long).

Insulating tape colours can differ too, to facilitate the work of electricians who need to distinguish different electrical wires between each other (because of this, there are sets with 9 different colours, which typically include black, white, red, grey, yellow, green, blue, yellow-green, and brown).

When should you use electrical tape?

When should you use insulating tape? Sometimes insulating tape can be useful for quick home repairs.

For example, you may want to change the hair dryer's power plug type from European to American: in this case, you could cut the wire near the plug, peel off the two electrical wires and, using electrical tape, connect them to an American plug.

Or, you might find yourself having to extend an electrical wire without using clamps: in that case, too, insulating tape will be useful.

In general, insulating tape is useful whenever you need to create a splice between electrical wires without being able or willing to use clamps; usually, for example, insulating tape is better than clamps whenever you have to deal with smaller diameter rigid cables, even more so if the alternative is direct fastening clamps.

Having outlined how to use insulating tape, let's have a look at how to use it properly.

How can you use insulating tape to insulate electrical wires?

How can you use insulating tape to insulate electrical wires? Let's assume you need to simply connect 2 electrical cables. You will need to get everything ready, and then go ahead and strip off the 2 copper wires on both sides.

This operation should be done using appropriate electrician scissors, which make it possible for you to gently remove the sheath protecting the copper wires, without cutting the metal filaments themselves. Once the 4 copper wires are visible (2 on one side and two on the other) you can create the splice by braiding the red wire with the other red, and the blue with the other blue (as an example).

At this point you can start using the insulating tape, with due caution.

If the cable isn't too big, use insulating tape with a reduced width (for example, 15 mm, i.e., 0.5 in) while for larger cables you will need to use insulating tape with greater width. The cables must also be perfectly clean, to avoid compromising the insulating tape's adhesive's grip.

For more information, please visit Hebei Top Tape.

How can you begin taping the electrical wires? Well, it all starts with the act of lifting one side of the electrical tape, pulling out about 2 cm (0.7 in) of tape. You will then be able to place the strip of tape on one side of the cable section to be taped, making it adhere well through slight pressure of your thumb and index finger.

Now you can proceed with the actual taping, unrolling a few centimetres of tape and then wrap it around the electrical wire: the first layer must be totally overlapped.

After this first layer, you can start moving slowly towards the other end of the stretch of cable to need to mask, one layer after the other. You should always remember that each layer must overlap about halfway with the previous one, always keeping the electrical tape tightly stretched.

Once the whole area is covered, it will be possible to make the last wrap-around, once again overlapping, like the initial one, then cutting off the excess electrical tape.

Cloth tape vs Insulation tape - - VW Club

Cloth tape vs Insulation tape

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Post by Pieta » Fri Oct 25, 9:20 am

Hi everyone,

I would like to know,

What is the best way to cover wires in the engine bay? I saw this cloth type electrical tape, is this any good or should I stick with insulation tape and heat shrink?

Thanks Pieter "Pieta" Oberholzer

-04 Audi A4 B6 1.8T
BT In process
Biltein + Eibach Sportline
Too much to mention

- 98 Polo 6N 2.0 8v

Re: Cloth tape vs Insulation tape

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Post by Scatman » Fri Oct 25, 9:28 am

Felt tape is great for interior, but for the engine bay I'd stick to some quality insulation tape. If wrapped correctly, the insulation tape will keep your wires dry, whereas felt tape will soak and may deteriorate your wiring over time. Current:
BMW 320d Msport Auto
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BMW E90 330d Manual
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Re: Cloth tape vs Insulation tape

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Post by Pieta » Fri Oct 25, 9:31 am

Scatman wrote:Felt tape is great for interior, but for the engine bay I'd stick to some quality insulation tape. If wrapped correctly, the insulation tape will keep your wires dry, whereas felt tape will soak and may deteriorate your wiring over time.
Aaah, thanks Martin for the clarity, it is for the dictator on the ABF...Want it to look kinda factory fitted. Pieter "Pieta" Oberholzer

-04 Audi A4 B6 1.8T
BT In process
Biltein + Eibach Sportline
Too much to mention

- 98 Polo 6N 2.0 8v

Re: Cloth tape vs Insulation tape

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Post by Torker » Fri Oct 25, 9:34 am

I hate insulation tape, I use either cloth tape or heat shrink. I redid the GT's original wiring with cloth tape more than a year ago and it still looks like the day I did it. Current rides:

VW Golf - 83 GT 2.1 16V 2-door with throttles
VW Golf - 78 LS 2.0 8V 4-door (2.1 ABF with throttles in progress)
VW Golf - '08 Citi Storm - 1.4 for now
Hyundai - 1.4 Getz (daily)

Re: Cloth tape vs Insulation tape

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Post by Naku786 » Fri Oct 25, 9:46 am

Torker wrote:I hate insulation tape, I use either cloth tape or heat shrink. I redid the GT's original wiring with cloth tape more than a year ago and it still looks like the day I did it.
+1 Cloth/material tape, its also OEM application IIRC. mine is 4 years now & still looks good
Scatman wrote:whereas felt tape will soak and may deteriorate your wiring over time.
Unless its gonna soak up about a liter of water I highly doubt that... cc racecar - back in the garage

Solo786 wrote:after you bust the rsi , should have put down the window and asked "Do you even lift bro?"

Re: Cloth tape vs Insulation tape

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Post by SHAUN » Fri Oct 25, 9:46 am

Cloth tape with sleeving over it. E92 335i * Monica
Audi S3 Quattro * Suzie-Q
Jetta 3 20vt 181kw 390nm * Jet-Li
Caddy 1.6 low and slow * Tossa-Caddy
Polo classic 16v ABF Featured * BLUEmotion
Bmw E30 2.9L - Written off
MKII GTI - Sold
MKII CSL - Sold
Saiendra wrote: I cannot argue with you, you bought a BMW out of motorplan...
You clearly have more balls than me.

Re: Cloth tape vs Insulation tape

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Post by Sparkz » Fri Oct 25, 9:47 am

and where can you buy the cloth tape? Current: Reflex Silver 6R Polo GTI


Ex Rides:
1.9TDi Sportline - 158.7Hp & 413Nm at K.A.R 19-05-
VWicked wrote: I could do 300km/h if I wanted but I don't trust my brakes stopping from that speed so as soon as i hit exactly 241km/h on my garmin i will tap off, generally it takes me me 6.9 sec to get there so I will just cruise the last 5 sec's to allow the car to cool down..

Re: Cloth tape vs Insulation tape

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Post by boost'd » Fri Oct 25, 9:47 am

where do you find cloth tape? EIGHTYSIXAUTOMOTIVE/ACD PERFORMANCE/RK MOTION

Re: Cloth tape vs Insulation tape

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Post by Pieta » Fri Oct 25, 9:48 am

Torker wrote:I hate insulation tape, I use either cloth tape or heat shrink. I redid the GT's original wiring with cloth tape more than a year ago and it still looks like the day I did it.
I also hate it, usually I use the heat shrink, always looks good, but saw this "Cloth" type tape, which was quite expensive.

PS hows the ABF running? Big difference between that and the 8v? Pieter "Pieta" Oberholzer

-04 Audi A4 B6 1.8T
BT In process
Biltein + Eibach Sportline
Too much to mention

- 98 Polo 6N 2.0 8v

Re: Cloth tape vs Insulation tape

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Post by Pieta » Fri Oct 25, 9:49 am

Sparkz wrote:and where can you buy the cloth tape?
Midas here by us keep it, but it is rather expensive vs Insulation tape. Pieter "Pieta" Oberholzer

-04 Audi A4 B6 1.8T
BT In process
Biltein + Eibach Sportline
Too much to mention

- 98 Polo 6N 2.0 8v

Re: Cloth tape vs Insulation tape

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Post by Naku786 » Fri Oct 25, 9:49 am

Gelmar sells, also some midas stock it, your friendly electrician I think you can also buy from VW but cant remember now cc racecar - back in the garage

Solo786 wrote:after you bust the rsi , should have put down the window and asked "Do you even lift bro?"

Re: Cloth tape vs Insulation tape

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Post by SHAUN » Fri Oct 25, 10:07 am

I buy my cloth tape online from these guys, cheapest I have seen it, from R35-R50 per roll

http://www.a-e-w.co.za/osc/index.php?cP ... 9d59be82e7 E92 335i * Monica
Audi S3 Quattro * Suzie-Q
Jetta 3 20vt 181kw 390nm * Jet-Li
Caddy 1.6 low and slow * Tossa-Caddy
Polo classic 16v ABF Featured * BLUEmotion
Bmw E30 2.9L - Written off
MKII GTI - Sold
MKII CSL - Sold
Saiendra wrote: I cannot argue with you, you bought a BMW out of motorplan...
You clearly have more balls than me.

Re: Cloth tape vs Insulation tape

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Post by Torker » Fri Oct 25, 10:18 am

SHAUN wrote:I buy my cloth tape online from these guys, cheapest I have seen it, from R35-R50 per roll

http://www.a-e-w.co.za/osc/index.php?cP ... 9d59be82e7
Bought my last lot from them as well, you get smooth and rough tape, the smooth tape looks better and the rough tape works better... Current rides:

VW Golf - 83 GT 2.1 16V 2-door with throttles
VW Golf - 78 LS 2.0 8V 4-door (2.1 ABF with throttles in progress)
VW Golf - '08 Citi Storm - 1.4 for now
Hyundai - 1.4 Getz (daily)

Re: Cloth tape vs Insulation tape

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Post by MarshallGTi » Fri Oct 25, 10:49 am

SHAUN wrote:Cloth tape with sleeving over it.

from what i've seen normal insulation tape doesnt enjoy being exposed to that much heat, and its a gooey mess when u want to take it off. It is an ingenius solution to a problem that should have never existed in the 1st place...

Ibiza FR


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EX-DOHCTOR wrote: I'd make sure I understand the differences between fish and engine components before attempting any modifications on my motor vehicle as a start.
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Re: Cloth tape vs Insulation tape

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Post by Pieta » Fri Oct 25, 11:19 am

What sleeving are you guys talking about? Pieter "Pieta" Oberholzer

-04 Audi A4 B6 1.8T
BT In process
Biltein + Eibach Sportline
Too much to mention

- 98 Polo 6N 2.0 8v

Re: Cloth tape vs Insulation tape

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Post by AlexTDi » Fri Oct 25, 11:35 am

Bookmarked! Alex
VWCSA Member No.

Daily: '06 Land Rover Freelander TD4 HSE
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EX:
Daily:
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Race Car: Golf MK1 2 Door

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Re: Cloth tape vs Insulation tape

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Post by Forest » Fri Oct 25, 11:39 am

Bought a roll at Wurth for R105 earlier this week, only to find it at Autozone for R35 and R45 a roll the next day... Stock Standard '89 Golf Mk2 VR6 (Sold)
Project "Merge" Mk2VR6 - The Build
'86 Golf Mk2 AGU 2 Door (Sold)
Project "Tudor" Mk2AGU -The Build

Re: Cloth tape vs Insulation tape

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Post by Solo786 » Fri Oct 25, 11:45 am

Want more information on automotive insulation tape? Feel free to contact us.

SHAUN wrote:Cloth tape with sleeving over it.
THIS