ABSTRACT
Since most plastics are thermal and electrical insulators, it is necessary to add a conductive material to the polymer in sufficient volume that a conductive path can be found through the matrix. The inherent conductivity, the shape of the particle, and the nature of the particle surface are all important but particle-to-particle contact is a
necessity [1]. Conductivity is usually determined by measuring volume resistivity which is given by Vr = RA/L where R is the measured resistance between two points, A is the cross sectional area through which the current flows and L is the distance between the two points. Therefore, the lower the volume resistivity, the higher the conductivity. The volume resistivity of some typical metals is given in Table I.
