It might also be from too hot of a soldering iron, water soluble flux migrating and causing the gapping/oxidation, or even an incompatible wash additive. I know of a few cleaners who destroy some mag wires so maybe this is similar.
Kat
----- Original Message -----
From: "Hogg, Blair K." <[log in to unmask]>
Date: Monday, August 27, 2007 4:22 pm
Subject: Re: [TN] 26 AWG HML Wire
To: [log in to unmask]
> I'm not sure about the process that applies the insulation, but if the
> wire is oxidized, perhaps the coating won't adhere?
>
> Blair
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Friday, August 24, 2007 2:30 PM
> To: [log in to unmask]
> Subject: Re: [TN] 26 AWG HML Wire
>
> Hi Donald!
>
> I got your pictures posted. I'll paste the appropiate picture
> links to
> each of your descriptions below...
>
> Steve Gregory
>
> ________________________________
>
> From: Donald Kyle [mailto:[log in to unmask]]
> Sent: Friday, August 24, 2007 11:08 AM
> To: [log in to unmask]
> Cc: Steve Gregory
> Subject: 26 AWG HML Wire
>
>
> 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
> wiresto 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.
>
> http://stevezeva.homestead.com/files/Picture_1.jpg
>
> In picture 2, the wires are held together with epoxy and the
> insulationhas peeled back where the wires make a bend.
>
> http://stevezeva.homestead.com/files/Picture_2.jpg
>
> In picture 3, is another wire with the insulation peeling back.
>
> http://stevezeva.homestead.com/files/Picture_3.jpg
>
> In picture 4, you are looking straight down the barrel. Notice
> how the
> insulation has come away all around the wire.
>
> http://stevezeva.homestead.com/files/Picture_4.jpg
>
> In picture 5, you are looking at picture 4 but at an angle.
>
> http://stevezeva.homestead.com/files/Picture_5.jpg
>
> In picture 6, you are looking at a good piece of wire from my
> stock.
>
> http://stevezeva.homestead.com/files/Picture_6.jpg
>
>
> Any ideas?
>
>
>
>
>
> Donald Kyle C.I.D.+
>
>
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