Connector covers are made from conductive polyethylene composite materials, are free of carbon black particulate, are permanently volume conductive and are low outgassing and noncorrosive. - Menda Connector Covers are made of an intrinsically conductive composite material with uniformly distributed fibers. This makes the covers free of carbon black particulate and better suited to clean situations. The covers do not leave black marks and are permantly conductive.
Suggested Replacement for 3M 4270 Series Connector Covers