Polyurethane (PU) covered conductors are thermally rated to operate up to temperatures of 140°C.

PU is a solderable, self-fluxing enamel wire offering distinct advantages to the user. The enamel insulating film has been specially formulated to decompose rapidly and solder at temperatures above 350°C, leaving minimum residue. This attribute produces a saving in assembly time and avoids damage to the conductor covering. This is particularly important when the finer wires are being used and reduces the danger of weak terminations and dry joints.

PU wire can therefore be tinned without prior removal of the enamel coating. Immersion for one or two seconds in a 60/40 tin/lead solder mixture heated to 360°C will remove the enamel coating and tin the copper.

It is also possible to tin Pu conductors with a soldering iron, the time taken will be determined by the mass of the termination. If desired a flux may be used to assist this operation but must be of a non-corrosive nature, preferably resin and not acid based.

Since the decomposition products in polyurethane are toxic, care should be taken to provide adequate ventilation, preferably an extraction unit at the soldering point.

The use of PU will be of greatest benefit to those in the electronics industry who are faced with numerous and difficult terminations.

PU is generally not available above 1,00 mm in diameter.

Please contact our technical department for further details.