Conductive polymer device with fuse capable of arc suppression

Details Conductive polymer device with fuse capable of arc suppression Conductive polymer device with fuse capable of arc suppression

1995-06-07

1999-07-20

Jeffery, John A.

Electric heating

Heating devices

With heating unit structure

219505, 219544, H05B 300

Patent

active

059252766

ABSTRACT:
A melt-extrudable conductive polymer composition which contains a polymer, a particulate conductive filler, and a particulate nonconductive filler. When a standard strip heater is made from the composition and tested in a UL VW-1 test, it has comparable performance to a heater made from a second composition which is the same as the composition but which does not contain the nonconductive filler. When tested in a standard arcing fault test, the standard heater will trip a fuse in less time than is required by the second heater, i.e. in less than 30 seconds. In some embodiments, the composition also comprises a flame retardant, preferably a halogenated flame retardant. When strip heaters prepared from these compositions are tested in a standard arc propagation test, an arc will not propagate. A preferred nonconductive filler is Sb.sub.2 O.sub.3.

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