Steve, would you mind posting these pictures for me.
Thanks in advance
Donald Kyle

Good morning

I have some inductors that were made recently that we are having an issue with.

They are wound multifilar with 26 AWG HML wire.  The problem is with 
the polyimide insulation; it's peeling off the wire.  Not good for 
the wires to short.

I'm suspecting that the insulation was not cured or maybe it's not 
polyimide insulation.

The insulation is peeling where the wire was bent tight and even 
where it wasn't.

These inductors have had a varnish applied and cured but no other 
processes after that except assembly onto boards.

Picture 1 is a lead that was soldered to the board; you can see the 
insulation has peeled back.

In picture 2, the wires are held together with epoxy and the 
insulation has peeled back where the wires make a bend.

In picture 3, is another wire with the insulation peeling back.

In picture 4, you are looking straight down the barrel.  Notice how 
the insulation has come away all around the wire.

In picture 5, you are looking at picture 4 but at an angle.

In picture 6, you are looking at a good piece of wire from my stock.


Any ideas?




Donald Kyle C.I.D.+  

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