Self-regulating heating materials are a type of smart materials, which are useful for applications where temperature controlling electronics are difficult to implement. In this work, the electro-thermal properties of carbon black (CB) and ethylene-octene copolymer (EOC) composites are investigated for use as self-regulating heating material. EOC-CB composites with different mass parts of CB ranging from 10 to 30 phr were investigated. The sample electrical resistance was measured as a function from temperature and the sample temperature was measured as a function from strength of electric current and voltage. The composite material exhibits positive temperature coefficient of resistivity, which means that the electrical resistance increases exponentially with the increase of temperature. The equilibrium temperature of composite samples is tunable with filler content and power supplied.