A conductive composite was prepared by blending carbon black with a modified crystal fluoride resin alloy. The formulation and the processing technology were optimized, and the positive-temperature-coefficient (PTC) characteristics under different conditions were studied by SEM, WAXD, and DSC. Relationships between the properties and the structures are illustrated, and applications of this composite in high-grade temperature self-regulating heating cables (135degreesC) are suggested. (C) 2003 Wiley Periodicals, Inc.