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Re: [TCML] Varnish for SSTC secondary

Ive gone through all sorts of varnishes. Some years ago the Dolph's AC43 was highly recommended and I used that. This is an industrial material used to varnish transformers. It was difficult to get it not to bubble up unless the temperature is held very constant during the drying process. I tried several other coatings and eventually I settled on a strategy developed by fellow TCML members.

After the secondary is wound I coat the windings with regular old "Spar Varnish" that is easily obtained at any home/hardware store in the U.S. This stuff is used on boats and other places where the surface will be subjected to water. One or two coats of Spar Varnish will keep the windings "glued" in place.

Then I coat the entire secondary in a thick layer of "Envirotex" which is also available locally, but also on line. The Envirotex is poured on and smoothed with a blade while the secondary is rotating (very wide putty knife works well for this for instance). That dries to a coating which is durable. I usually coat to 1/16-1/8" thick, and I apply 2 coats, allowing for complete drying throughout. So the process takes several days.

The Envirotex is also prone to bubbling if it is not applied/dried at a constant temp.

Pics of my coil winding process available here: <http://www.flickr.com/photos/iceowl/5995053288/in/photostream>


On 2/1/2013 7:29 AM, Atomic wrote:

When I bought magnet wire for my small SSTC I also bought a can of varnish
but I'm not sure it's the right one.

These are the datasheets but unfortunately they are in Portuguese - the
varnish is the Lacktherm 1303.

This one says it's a polyester based varnish modified to try on air.
Indicated for motors up to 50hp and small transformers and coils.

This one says it's alkyd diluent 1021. Also says it's for low voltage (up
to 480V) transformers and reactors.

The varnish can says it's a modified alkyd rosin, aliphatic and aromatic

Can I sue this?

If I can't which one should I get? Note that I don't have a spinning rig
and will have to apply it manually.
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