New ESD control material based on special carbon

New ESD control materials, based on combining special carbon material with moderately conductive surface resistivity with polycarbonate (PC) and polyetheretherketone (PEEK), have been developed and assessed. The surface resistivity of special carbon with resistivity of 10⁷ ohms/sq., filled with PC and PEEK, remained in the range of 10⁹ to 10⁸ ohms/square regardless of the carbon content beyond each critical. The surface resistivity was easily controlled at the specific levels required for ESD control materials by using the special carbon. The surface resistivity fluctuation on the injection-molded plate was very small and the surface resistivity change against applied voltage was small.