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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I am building a small SGTC powered by an ignition coil invertor I have a white teflon/ptfe tube (3 inches od x 12 inches high) for the secondary on which I will wind about 1200 turns of 0.2mm copper wire (0.233mm incl. enamel)
Normally I'd use polyurethane varnish to secure the windings but this time I'd like a truly clear/transparent varnish for cosmetic reasons.
Can anyone reccommend a truly clear varnish/laquer? Low dielectric loss would be good too.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
The stuff I have comes either in brush on/spray on, and has a very slight brown tint to it (but for the most parts is clear)... I am just guessing that you have some type of stain/varnish mix.
Registered Member #92
Joined: Thu Feb 09 2006, 03:11PM
Location: Indian Trail, NC
Posts: 39
Sherwin Williams has an industrial line of products and one is a spray can of clear insulating enamel for motor windings. I borrowed a can from my local motor winding shop and it worked great. Steve
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Any cheap polyurethane clear spray lacquer should do fine. Spray application is also far more rewarding the brush-and-rotating-jig slavery.
the lacquer isn't going to stick to the teflon though -- but it'll hold the wire together onto the former just fine. Just watch that with impact the winding doesn't start slipping off the secondary! (that was the obvious secret behind my 'formerless coil' :P hehehe)
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I used to use ordinary clear lacquer, from the car parts shop. The only thing is you need to use a LOT of coats, because it is so thin. The early coils I made, I gave them 3 coats, but the windings still separated and fell off a few months later. Therefore I would recommend at least 8 coats.
I've now started using stain/varnish for my coils now, because it gives the coil a nice deep copper-like finish.
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Colourless varnish required
