LFT for EMI shielding

PlastiComp LLC’s newest long-fiber thermoplastic (LFT) compounds provide up to 70 dB EMI shielding at frequencies of 1 MHz and higher.

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PlastiComp LLC’s (Winona, Minn.) newest long-fiber thermoplastic (LFT) compounds provide up to 70 dB EMI shielding at frequencies of 1 MHz and higher. The compound was developed for consumer electronics enclosures in which current electromagnetic interference (EMI) shielding materials, including nickel-coated carbon fibers, are efficient only in the 30 to 40 dB range, the company maintains. Moreover, nickel-coated carbon fiber and a secondary conductive paint application are cost-prohibitive, and the fibers reportedly lose mechanical properties and shielding efficiency at lower part sectional thicknesses. The new carbon/nylon compound, however, was designed to meet part requirements — stiffness of 35 GPa or higher, 50 dB or higher shielding, surface resistivity of 5 ohms/square or less and part thicknesses of 1.5 mm/0.06 inches or less — yet meet real-world cost restraints. Long fibers and proprietary additives create a conductive fiber network with high shielding amd high part stiffness.