How to Work With Conductive Fabric

Ohms Per Square

Conductive fabrics are made up of different fibers (e.g. nylon, cotton) and conductive metals (e.g. stainless steel, silver, copper). The resistance of a particular fabric depends on what conductor is used and how it is made. When purchasing conductive fabric the unit of resistance will be listed as Ohm/Sq or Ω /▢, meaning Ohms per Square.This unit of measurement calculates the sheet resistance of a material.

What does it mean?

If a fabric is labeled as 2 Ω per ▢ it means that when the material is cut in a square, no matter how large or small that square is, it should be 2 Ohms. If cut in another dimension, such as a rectangle, the Ohms per inch are multiplied by the aspect ratio. For example:

If we define a 1" square an one unit and cut a rectangle that is 1" x 3", the aspect ratio if that rectangle is 3.

2 Ω (per ▢) x 3 (aspect ratio) = 6 Ohms

The thickness is also taken into account when coming up with this unit. If you wanted to calculate your own sheet resistance, two multimeters and 4 probes would be needed. We won't go over how to do this, the resistance you measure using your one multimeter will be more useful to you and your projects. If you would like to learn more, check out this explanation of Four Point Probe Resistivity Measurements.

Figuring Out Resistance

So, now we know what Ohm/Sq. means. This measurement is different than the resistance you will need when figuring out what voltage and current you will need and so on. It is helpful when buying material, look at this measurement as a guide to get a sense of it's conductivity.

The circuits you build will be made of specific sizes and shapes created by you. To get the resistance, cut you basic shapes and keep a multimeter by to test each trace or shape that you make. You may be able to come up with a unit of measurement yourself. If you are cnc cutting swirls and know that one swirl is 6 Ω, you then know that when you make your larger circuit, comprised of 10 swirls, the resistance will roughly be 60 Ω.

Voltage/Current Ratings

Most fabrics I have found and worked with do not state the current or voltage that the material can handle. If it is not available, be cautious when working and email the manufacturer for advisement. Remember that it's uninsulated, so you if you are pumping a good amount of power through an exposed circuit, it can be dangerous. Be extremely careful not to create a short, you could get electrocuted! Jump to the step on insulation to learn how to protect and insulate yourself and the circuit from contact and weather conditions.

Conductive Vs. Resistive

Electrical conductivity measures a material's ability to conduct electrical current. If a material has high conductivity and low resistance, current moves freely through it.

Electrical resistivity is the measurement of how strongly a material opposes the flow of electrical current. If something has high resistance, it therefore has low conductivity.

Fabrics with electrical properties can be put into either category. I can't put a particular cut off point where one material becomes resistive and not conductive, because it will always be conductive and have resistivity. From my experience, when a fabric is called resistive, it usually means that it will measure to be 1K Ω/▢ or more.

When thinking of what makes a fabric conductive, I remind myself that wire typically used for traces and connections can be anywhere from .02 - 10Ω. This is dependent of length too. Always grab the multimeter to test for yourself!

How to Choose for a Specific Purpose

When used to replace traces in an electrical circuit, the fabric you want to use is the one with the lowest resistance.

For contactswitches, the same is true, choose a fabric that has low resistance. You can get away with high resistive fabrics sometimes, but it's easier to stick to one rule.

Capacitive touchswitches can be made using material that has a fairly high resistance, the change in voltage is all that is being detected.

Resistors can be replaced using resistive materials by cutting the right dimension of a resistive material to equal the value you are looking to replace.

When pressure or force is applied to piezoresistive materials the electrical resistance changes. This makes them ideal for creating sensors, especially force sensing resistors (FSRs), bend sensors and stretch sensors.

Fabric which can conduct electricity

A conductive textile is a fabric which can conduct electricity. Conductive textiles can be made with metal strands woven into the construction of the textile or by conductive yarns which are conductive thanks to a metal-coating. Some historic fabrics use yarns of solid metals, most commonly gold. Alternatively, novel materials such as nanomaterials (including graphene, and carbon nanotubes) or conducting polymers may also be used as the conducting materials.[1] There is also an interest in semiconducting textiles, made by impregnating normal textiles with carbon- or metal-based powders.[2]

Conductive fibers consist of a non-conductive or less conductive substrate, which is then either coated or embedded with electrically conductive elements, often carbon, nickel, copper, gold, silver, titanium or PEDOT. Metals may be deposited chemically with autocatalytic chemistry,[3] printed with conductive nanoparticle inks,[4] or applied with physical vapor deposition methods.[5] Substrates typically include cotton, polyester, nylon, and stainless steel to high performance fibers such as aramids and PBO. Straddling the worlds of textiles and wires, conductive fibers are sold either by weight or length, and measured in denier or AWG.

Because of the rapid growth in the kinds of conductive fibers and the uses of these fibers, a trade association—the Conductive Fiber Manufacturers Council[6]—was formed to increase awareness, utilization, and possibly standardize terminology.

Applications

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Uses for conductive fibers and textiles may include static dissipation, EMI shielding,[7] signal and power transfer in low resistance versions, and as a heating element in higher resistance versions. Their benefits over solid or stranded metal wires come from conductive fibers' flexibility and ability to use them in existing textile and wire machinery (weaving, knitting, braiding, etc.).

The sport of fencing employs lamés, jackets made of conductive textiles, to detect hits in competitions.

One major use is by Micro Coax's ARACON™ fiber built on a KEVLAR® base, and used for shielding cabling in air- and spacecraft and other speciality purposes where light weight, high strength, and high-frequency shielding is imperative. Another more recent use is in the production of 'stun gun' or Taser-proof clothing, where the conductive textile forms a flexible Faraday cage in a layer of the garment. Conductive fabric can also be used to make electrodes for EEG and other medical applications;[8] such electrodes were used in a commercially available sleep-monitoring device made by former company Zeo, Inc. Highly conductive stainless steel fiber is available.[9]

See also

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References

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In the realm of textiles, there exists a remarkable innovation that combines functionality with style-conductive fabrics. These extraordinary materials possess unique characteristics that have revolutionized numerous industries, from fashion and healthcare to technology and sports. In this comprehensive article, we delve into the fascinating world of conductive fabrics, exploring their properties, applications, and the benefits they offer. Join us on this captivating journey as we unlock the wonders of conductive fabrics and understand why they are becoming increasingly sought after in the modern era.

What are Conductive Fabrics?

Conductive fabrics, also known as smart textiles, are textiles that have been engineered to possess electrical conductivity. Unlike traditional fabrics, which are primarily passive in nature, conductive fabrics actively interact with their environment through the transmission of electrical signals. This unique property is achieved by incorporating conductive elements, such as metal fibers or conductive polymers, into the fabric structure.

The characteristics of conductive fabrics

1. Electrical Conductivity

The defining characteristic of conductive fabrics is their ability to conduct electricity. These fabrics exhibit low resistance and can effectively transmit electrical signals across their surface. This property opens up a multitude of possibilities for various applications, ranging from wearable technology to electromagnetic shielding.

2. Flexibility and Durability

Conductive fabrics are designed to be flexible, allowing them to conform to different shapes and movements. This flexibility makes them ideal for applications that require conformable and stretchable materials, such as smart clothing and wearable sensors. Despite their pliability, conductive fabrics also possess remarkable durability, ensuring they can withstand repeated use and maintain their functionality over time.

3. Breathability and Comfort

One might assume that incorporating conductive elements into fabrics would compromise their breathability and comfort. However, modern advancements in textile engineering have successfully overcome this challenge. Conductive fabrics can now be designed with enhanced breathability, ensuring optimal comfort for the wearer. This feature is particularly crucial in applications where extended use is required, such as sports apparel and medical garments.

4. Sensing Capabilities

Another remarkable characteristic of conductive fabrics is their ability to sense and respond to external stimuli. By integrating sensors into the fabric structure, these textiles can detect various parameters such as temperature, pressure, and moisture. This sensing capability has led to the development of smart textiles that can monitor vital signs, track movement, and provide valuable data for medical diagnostics, sports performance analysis, and more.

5. Versatility and Customizability

Conductive fabrics offer a high degree of versatility and customizability, allowing designers and manufacturers to tailor their properties to specific requirements. The choice of conductive materials, fabric structures, and integration methods provides endless possibilities for creating unique and innovative solutions. This adaptability has propelled conductive fabrics into diverse industries, including fashion, automotive, aerospace, and architecture.

Applications of Conductive Fabrics

The remarkable characteristics of conductive fabrics have paved the way for a myriad of applications across various sectors. Here are just a few examples of how conductive fabrics are transforming industries:

1. Smart Clothing and Wearable Technology

Conductive fabrics are at the forefront of the wearable technology revolution. They enable the integration of sensors, actuators, and connectivity into clothing, making way for smart garments that can monitor health parameters, track physical activity, and even charge electronic devices. From fitness trackers to temperature-regulating jackets, conductive fabrics are redefining the way we interact with our clothing.

2. Medical and Healthcare

In the field of healthcare, conductive fabrics have proven to be invaluable. These fabrics can be used to create smart bandages that monitor wound healing, wearable sensors for remote patient monitoring, and even electrodes for non-invasive medical procedures. Conductive fabrics are also being explored for their antimicrobial properties, which can help prevent infections and improve patient outcomes.

3. Electromagnetic Shielding

Conductive fabrics play a crucial role in shielding against electromagnetic interference (EMI). They can be used to create protective garments, curtains, and enclosures that safeguard sensitive electronic devices from unwanted signals. This application is particularly significant in industries such as aerospace, defense, and telecommunications, where the reliability of electronic systems is paramount.

4. Energy and Power

Conductive fabrics are being harnessed for their potential in energy generation and storage. By integrating energy-harvesting technologies into textiles, conductive fabrics can capture and convert ambient energy, such as body heat or mechanical vibrations, into electrical energy. This innovation holds promise for powering small electronic devices and reducing our reliance on conventional batteries.

Conclusion

Conductive fabrics represent a paradigm shift in the world of textiles, bridging the gap between fashion, technology, and functionality. Their exceptional characteristics, including electrical conductivity, flexibility, breathability, sensing capabilities, and customizability, have propelled them to the forefront of innovation across numerous industries. As we continue to unlock the full potential of conductive fabrics, we can anticipate a future where our clothing not only adorns us but also enhances our lives in unprecedented ways. We are a conductive fabrics supplier. If you are interested in our products, please contact us now!