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News

Premix introduces EMI shielding compounds

Premix Oy : 14 November, 2006  (Company News)
Premix Thermoplastics, a custom compounder of electrically conductive thermoplastic compounds, has developed a complete line of EMI shielding compounds for electronic enclosures called PRE-ELEC EMI. These compounds were developed to complement Premix
Premix Thermoplastics, a custom compounder of electrically conductive thermoplastic compounds, has developed a complete line of EMI shielding compounds for electronic enclosures called PRE-ELEC EMI. These compounds were developed to complement Premix’s PRESEAL product line. This gives Premix a complete line of EMI shielding compounds for the complete enclosure.

Premix’s PRESEAL product line is based on SEBS elastomer and filled with a variety of silver coated and/or nickel coated particles. These compounds are designed for injection molding and extrusion of EMI gasketing materials. PRESEAL replaces silicone gasketing materials as it is easier to process and is recyclable (scrap can be reground and remolded or extruded). Most PRESEAL compounds provide 90 dB or more of shielding effectiveness, and some of the PRESEAL compounds have compression set as low as 30%.

Premix Thermoplastics, Inc. has also introduced its PRE-ELEC EMI compounds. These compounds utilize carbon fibers, nickel coated carbon fibers or stainless steel fibers to give them EMI shielding capabilities. They are available in virtually any thermoplastic resin system, but more especially the engineering thermoplastics and the high temperature thermoplastics such as ABS, PA6, PA66, PC, PSU, PPS, PES and PEEK.

The stainless steel fiber compounds are available in fully compounded form or in a dry blend form where all of the additives in the compound are in the resin except the stainless steel fibers, which are blended into the resin in the form of a concentrate, thus preserving the fibers in a more linear manner, and enhancing the EMI shielding capability. The physical and thermal properties of both the fully compounded and the dry blended series are identical. Below are some comparative graphs of stainless steel fibers in a polycarbonate.
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