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eConduct: Conductive Pigments for EMI Shielding

eConduct are silver coated pigments which can be used as electrically conductive filler materials in EMI shielding solutions.

eConduct: Conductive Pigments for EMI Shielding
eConduct: Conductive Pigments for EMI Shielding

The combination of the high electrical conductivity of the silver shell with a pigment core consisting of a comparatively inexpensive material allows us to provide a hybrid system with balanced cost-performance ratio.

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The eConduct product range from ECKART contains either flake shaped or spherical silver-coated glass, aluminum or copper substrates, which are provided in powder form.

eConduct: Conductive Pigments for EMI Sheilding.
Optical appearance of eConduct powders and exemplary SEM micrographs of eConduct Al 202000, eConduct Cu 340500 and eConduct Glass 352000 (from left to right)

The right choice of eConduct pigment generally depends on the required electrical conductivity, the application method and the preferred type of binder system. Our experts at ECKART are looking forward to assisting you – we are waiting for your inquiry.

The following grades are currently available:

 

Application Examples

In order to successfully block electromagnetic radiation a conductive enclosure following the principle of a Faraday cage is required. However, due to low costs, low weight and simple production methods, most enclosures nowadays are fabricated from polymers which are not electrically conductive.

Consequently, such non-conductive plastic casings must be equipped with an electrically conductive coating in a subsequent step.

This can be achieved by using conductive paints based on our eConduct grades. An application via spraycoating not only adds only little additional weight but also allows to equip plastic enclosures with complex designs and geometries.

EMI-shielding performance of coatings based on eConduct.

Polyacrylic formulations based on our conductive pigments were spraycoated on PET substrates. The pigment volume concentration (PVC) for flake shaped pigments was 25% whereas the PVC for spherical fillers was adjusted to 60%. The reference sample was a PET substrate coated with the not filled polyacrylic paint. The film thicknesses of the applied coatings were in the range of 50 to 200 µm.

The shield attenuation tests were performed according to ASTM D 4935-10. As can be seen form the graph, shield attenuation values in the range of 45 to 60 dB could be achieved.

EMI-shielding performance of coatings based on eConduct.
Shield attenuation tests of polyacrylic formulations filled with eConduct and spraycoated on PET performed according to ASTM D 4935-10.

Remark: Depending on the required frequency range other methods might be considered.

What is electromagnetic shielding?

Electromagnetic shielding is reducing an electromagnetic field within an area by blocking the interference with a barrier comprised of a conductive material.

Electromagnetic radiation

Electromagnetic Radiation is when waves of an electromagnetic field radiating through space. EMR is omnipresent and inevitable with respect to modern electronic communication. Prominent EMR sources are FM radio, TV, mobile phones (5G, NFC, Bluetooth), wireless LAN etc

ApplicationFrequency Range (MHz)
FM Radio and TV80-800
Mobile Phones453.5 - 1,980.0
Mobile Phone Base463.5 - 21,170.0
Microwave Links1,000
Cordless Phones1,800 - 1,900
Terrestrial Trunked Radio380 - 470
Bluetooth Devices2,450
Baby Monitors40, 445, 865, 1,900 and 2,450
Wireless LAN2,450 and 5,000
Smart Meters900 - 1,900 or 2,400
Diathermy2,450
Microwave Ovens915 - 2,450
Radar30 - 300,000
Near field comm (NFC)13.56
Civil Aviation127.8


Zhi et al., Military Medical Research (2017) 4:29 DOI 10.1186/s40779-017-0139-0

Electromagnetic interference

Electromagnetic interference (EMI), or radio frequency interference (RFI), is the disturbance caused by an electromagnetic radiation (EMR). This interference can cause malfunction and failures of sensitive electronic components.

Electromagnetic compatibility

Electromagnetic compatibility (EMC) is when electrical equipment functions properly in it its intended environment by dampening EMR and thus reducing EMI. nearly all electronic systems are required to meet EMC. Consequently, EMC is a product safety as well as compliance issue → Various EMC standards available 

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