Conductive materials offer one-step EMI solutions
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Premix Thermoplastics product story
Edited by the Engineeringtalk editorial team
May 2, 2006
Premix Thermoplastics has introduced a full line of EMI shielding compounds for electronic enclosures called Pre-Elec EMI.
Premix Thermoplastics, a custom compounder of electrically conductive thermoplastic compounds, has introduced a full line of EMI shielding compounds for electronic enclosures called Pre-Elec EMI.
These new products complete Premix's line of EMI shielding compounds for the complete electronics enclosure.
Premix has, or can develop, specialty compounds to solve EMI problems in most electronics enclosures.
These materials offer one-step EMI solutions.
Available in virtually any thermoplastic resin system, Pre-Elec EMI compounds use stainless-steel fibres, carbon fibres, or nickel coated carbon fibres to provide EMI shielding capability.
Currently these compounds are available in PP, ABS, POM, PC, PBT, PA-6, PA-66, PPS, PSul, PES and Peek.
Other polymer systems that contain these conductive additives are TPUs and various fluoropolymers.
Compounds using stainless-steel fibre additives are available in either a fully compounded form or a dry blended form.
With the dry blended form, all of the additives in the compound are in the resin except the stainless steel fibres.
These are blended into the resin in the form of a concentrate, thus preserving the fibres in a linear manner, which enhances the EMI shielding capability.
The physical and thermal properties of both the fully compounded and the dry blended forms are identical.
Compounds using carbon fibres or nickel coated carbon fibre additives are available only in fully compounded forms.
Compounds containing 30% carbon fibre additives can provide 30dB electromagnetic interference attenuation.
At 40% carbon fibre, it is possible to achieve 40dB shielding effectiveness (SE), and at 50% carbon fibre 50dB SE can be obtained.
Nickel coated carbon fibres can be effective with as little as 15% in the compound, and they can provide upwards of 90dB shielding effectiveness at higher loadings.
The new Pre-Elec EMI compounds were developed to complement Premix's Preseal product line, which is based on SEBS elastomer and filled with a variety of silver coated and/or nickel coated particles.
Preseal compounds are used for injection moulding and extruding EMI gasketing materials.
They provide an ideal replacement for silicone gasketing materials because they are easier to process and are recyclable (scrap can be reground and remoulded or extruded).
Most Preseal compounds provide 90dB or more of shielding effectiveness; and some compounds have compression set as low as 30%.
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