Higher melt temperatures and slower fill speeds tend to layer the carbon black particles on the part surface. A more conductive carbon black part typically has a more mottled, duller surface. A glossier surface is more resin rich and usually less conductive. Decreased packing usually increases surface conductivity. Mold temperature does not have a significant effect on conductivity.
Surface conductivity is usually independent of back pressure and screw speed.
Compounds with Conductive Fibers Conductive materials based on carbon fiber typically require opposite molding conditions from conductive fillers. Use the base resin drying requirements for carbon fiber reinforced compounds. All corners in the flow path should have generous radii. Short shots in carbon fiber are typically non-conductive. A typical carbon fiber molding is more conductive near the gate.