Semi-conductive polymer composition

A semi-conductive polymer composition consisting of:

• (A) an ethylene-methyl acrylate (EMA) copolymer, present in an amount from 45 to 65 wt % of the total polymer composition;
• (B) an atactic polypropylene homopolymer, present in an amount from 1 to 10 wt % of the total polymer composition;
• (C) carbon black, present in an amount from 30 wt % to 36 wt % of the total polymer composition;
• (D) optionally a cross-linking agent;
• and
• (E) optionally at least one further additive selected from the group consisting of antioxidants, scorch retarders, cross-linking boosters, stabilizers, processing aids, flame retardant additives, acid scavengers, inorganic fillers, voltage stabilizers, and additives for improving water tree resistance;
• wherein the atactic polypropylene homopolymer (B) has a degree of crystallinity below 0.5%;
• and
• wherein the atactic polypropylene homopolymer (B) has a Mw below 35,000.