This is Kitronik’s very own Electro-Fashion® branded Conductive Thread and we think it is among the best conductive thread available. It is perfect for hand sewing and can also be used on the bottom bobbin of a sewing machine (this will require the thread to be wound on to the smaller bottom bobbin first).

Conductive thread can be used like conventional sewing yarn, however it electrically conducts allowing electronics to be integrated into textiles. This makes it ideal for use in a range of e-textile applications.

The thread is nano plated with silver to make it conductive. The conductive thread has a generally low resistance but it does vary. We have measured between 40 and 160 ohms per meter, depending on the tension the thread is under. Once sewn the resistance is typically in the middle of this range. Over time the silver plating will degrade particularly if washed and we have measured in excess of 280 ohms on some of our older examples.

Resistance does not vary significantly from one length of thread to the next, so you should be able to use this thread without concern for “dead” sections.

The conductive thread has a breaking strain of around 9.3 pounds (4.2 kilos). It comprises roughly 96 individual filaments, each coated with a micron-thick layer of natural silver. This plating of the yarn is done in Europe to ensure as high a quality finish as possible. In construction, 16 of these filaments are wound together to form an initial twist; two of these twists are then twisted together, and finally three of these twists are combined to form the finished thread. The conductive thread is approximately 18 denier. It is heavier than a regular sewing thread, but not as heavy as an upholstery thread. It can be sewn on most domestic sewing machines using either a regular needle or the next size up. This thread does not fray.

Features:

No (or very low) fray.
Resistivity = approximately 80Ω per metre (24.4Ω per foot).
Count = 875 dTex.
Strength 3000 cN.
Elongation at break = 37%.
Twist = 240Z-380S.

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Questions and answers

what is the size/thickness of this spindle? im trying to see if it would fit in my sewing machine

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Q what is the size/thickness of this spindle? im trying to see if it would fit in my sewing machine
Asked by Winter Mraz on May 1, 2019 12:00 am

Answered by the admin Hi Winter,

The thread is approximately 18 denier so about the same thickness as darning thread. We have used this thread on our machines here before if that helps.

The thread quality seems to have changed, so the thread that used to be really soft is now much mere metalic and silvery. Du you still have the old version for sale?

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Q The thread quality seems to have changed, so the thread that used to be really soft is now much m...... Read more
Asked by Sophie Hovdekorp on December 11, 2018 12:00 am

Answered by the admin I am sorry to say... After checking all availlable versions of the thread. (250 m, 45/50 m and the smC%l 2/6 meters - They have all changed since I originally bought my 250 m. roll back in 2017.
The thread is now on the latest 250 m. roll frizzy and feels like the one you can buy from Sparkfun - which is by no means recommendable for projects, where you have to sew with a very small distance between the threads. At least not in projects other than prototypes.

Hi, I was wondering how thick this thread was dimension wise?

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Q Hi, I was wondering how thick this thread was dimension wise?
Asked by Ploy on June 27, 2018 12:00 am

Answered by the admin Hi Ploy, The thread is 18 denier, typically denier is used to determine the size of the thread. 18 Denier is larger than standard sewing thread but not as large as upholstery thread.

Hi, Does this thread hold up to multiple washes?, does it tarnish or erode when exposed to water and can it be warn safely (i guess this depends on the power running through it) with heating and discharging power when touching the skin.Andy HillyardFashion UK

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Q Hi, Does this thread hold up to multiple washes?, does it tarnish or erode when exposed to water...... Read more
Asked by Andy Hillyard on August 5, 2015 12:00 am

Answered by the admin The conductive thread can be washed and once dry used, however we don’t have any data to suggest how it will cope over a long period of time. Also in regards to the thread tarnishing or eroding we don’t have any data to suggest how the thread will degrade, however this would depend on the conditions that the thread was exposed to, such as period of time wet, frequency and water quality. In regards to the thread being warn safely it would depend on the voltage as you stated, realistically though the thread would burn up before it became unsafe to wear and have the possibility of giving a shock.

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