A heater preform comprised of a layer of magnetic material on a layer of nonmagnetic conductive metal comprises a self-regulating heater, and the heater preform is wrapped around or against a solder preform within a length of heat recoverable tubing. A conductor wire is inserted into one end of the tubing...http://www.google.com.au/patents/US5064978?utm_source=gb-gplus-sharePatent US5064978 - Assembly with self-regulating temperature heater perform for terminating conductors and insulating the termination
