RESEARCH ON RADIATION CROSS-LINKED SELF-REGULATING ELECTRICAL HEATER

A self-regulating electrical heater whose resistivity is characterized by a positive temperature coefficient, consists essentially of electr cally conductive thermoplastic compositions achieved by the addition o f conductive carbon black to a polymeric base. The sample series are Z D-25 type and ZD-50 type. Thir thermal outputs reach to 25 W/M and 50 W/M respectively, when surroumding temperature is 10 degrees C. The re sistivity variance of the electrical heater with remperature has been investigated. The relation between the thermal outputs of the electric al heater and surrounding temperature has also been investigated.