New injection moldable ESD compounds based on very low carbon black loadings

The electrical resistivity, mechanical properties, outgassing, ion contamination and particle-shedding characteristics of new electrostatic dissipative (ESD) injection moldable thermoplastic composites containing carbon black and glass fibers were studied. The results for polypropylene, polybutylene terephthalate and polycarbonate based compounds were compared to typical carbon black and carbon fiber filled materials. Injection moldable composites with desired resistivities in the static dissipative range (10/sup 6/-10/sup 9/ /spl Omega//sq) for conveying in production lines, storage, shipment and for cleanroom applications, having good and balanced mechanical properties can be prepared by combining a number of polymeric materials with glass fibers and less than 2 wt% carbon black.