Re: Why some Litz wire is difficult to strip

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>

Tesla list wrote:
> 
> Original poster: "Scott Hanson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <huil888-at-surfside-dot-net>
> 
> There are many different types of insulating "varnish" applied to magnet
wire,
> depending on the application: temperature requirements, environmental
exposure,
> bend radius, voltage, processing requirements, polymer type, etc, etc.
> 
> Insulating coatings can be broken down into many different groups. One
possible
> grouping is based on how the wire is stripped for soldering. One group
> (including the very common "Formvar" varnish, Polythermaleze, etc) requires
> mechanical or chemical removal of the coating. Even extended immersion in a
> solder pot with highly activated flux WILL NOT remove this type of
coating and
> allow the wire to "tin".
> 
> Other coatings ("Sodereze" "Nyleze", etc) are specifically designed to allow
> tinning in a solder pot. Often this results in somewhat of a trade-off of
> thermal, mechanical, or chemical resistance.
> 
> In my experience, the thickest, toughest, most robust, highest temperature
> insulation will always be the most difficult to strip & tin.
> 
> This probably explains why some users find their wire easy to tin, and others
> find it almost impossible, especially with surplus wire that may not have the
> insulation identified.
> 
> Scott Hanson

I've never had any problems stripping any type of magnet wire.  I use a
very hot soldering iron with a big glob of solder.  If you get the end
hot enough, the hot flux starts to dissolve the coating.  This even
works with large gauge wire if you have a 175W iron like I do.  I can't
comment on Litz wire though.  

Recently I bought some 26ga teflon insulated wire from Newark.  They
have 1000ft spools of 32ga.  Sounds like the ultimate for coils. And I'm
sure the silver plating won't hurt either.

Rob.

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