By optimizing particle shape, size distribution and particle-to-fiber ratio, up to 85 dB of shielding effectiveness is obtained. The powder is integrated into the PREMIER’s uniquely engineered filler system delivers 6 sigma molding performance at various costperformance break points. Unlike stainless steel fiber fillers, the carbon core will bend and flow around and into cavity details without breaking or clogging. The inherent material properties of both nickel and carbon make PREMIER a highly lossy (dissipates energy) material that is paramagnetic.

To ensure even dispersion, the Ni-C fibers are treated with a unique, proprietary dispersion technology. The dispersion agent when combined with the low sheer mechanical action experienced in the injection molding process delivers a randomly oriented, evenly dispersed and interlocked fiber matrix within the polymer. Only Chomerics has a dispersion agent that effectively promotes an even matrix throughout complex part geometry. Only PREMIER eliminates the gate clogging typically found with EMI shielding plastics. When dispersed the engineered fiber matrix provides the optimum filler morphology for performance. The foundation of PREMIER’s EMI shielding performance is the high aspect ratio Ni-C fiber. The long pathways of uninterrupted electrical conductivity provide low bulk conductivity. A minimum level of fiber is needed to provide effective EMI shielding and all grades of PREMIER have this level.

To increase performance, particulate nickel graphite powder is added to the base fiber matrix to create higher shielding grades. The inclusion of powder to augment the fiber matrix is indicated by “HF” in the material grade designation (Figure 2).

PREMIER is a single component pellet system. The polymer is cross head extruded on top of the dispersion agent treated Ni-C fiber tow. The “HF” grade has nickel graphite powder that is compounded into the polymer. The polymer-filler system is chopped into pellets ready for injection molding.

The pellet length optimizes the conductive fiber aspect ratio to maximize shielding. The single component system eliminates mixing or weighing at the press, fiber nesting and clogged extruder throats. PREMIER parts provide shielding effectiveness greater than 85 dB to meet global commercial EMC requirements. PREMIER provides the electrical conductivity, EMI absorption, and mechanical durability to replace aluminum and plastic housings that have been metallized or conductively coated.