Abstract: A composition for forming a cast nylon part comprising a base caprolactam mixture and at least one of a first additive comprising acetylene carbon black; a second additive comprising at least one of nonyl phenol ethoxylate, silicon oil, and at least one nonionic surfactant having a viscosity similar to that of nonyl phenol ethoxylate; a third additive comprising silicon dioxide; and a fourth additive comprising intercalated expandable graphite.