Colourless varnish required
Sulaiman, Sat Oct 21 2006, 06:05PMI 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.
Re: Colourless varnish required
Marko, Sat Oct 21 2006, 07:12PM
Polyurethane spray I have here is colorless..
Color must be some additive they stuffed in.
Marko, Sat Oct 21 2006, 07:12PM
Polyurethane spray I have here is colorless..
Color must be some additive they stuffed in.
Re: Colourless varnish required
..., Sat Oct 21 2006, 07:26PM
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.
Short of that, you can always use epoxy...
..., Sat Oct 21 2006, 07:26PM
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.
Short of that, you can always use epoxy...
Re: Colourless varnish required
teravolt, Sat Oct 21 2006, 11:16PM
won't the windings unravel with out spray especialy on teflon
teravolt, Sat Oct 21 2006, 11:16PM
won't the windings unravel with out spray especialy on teflon
Re: Colourless varnish required
ReddyK, Sun Oct 22 2006, 12:28AM
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
ReddyK, Sun Oct 22 2006, 12:28AM
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
Re: Colourless varnish required
ragnar, Sun Oct 22 2006, 01:28AM
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)
ragnar, Sun Oct 22 2006, 01:28AM
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)
Re: Colourless varnish required
Avalanche, Sun Oct 22 2006, 08:23AM
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.
Avalanche, Sun Oct 22 2006, 08:23AM
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.
Re: Colourless varnish required
Simon Barsinister, Sun Oct 22 2006, 08:27PM
This is the stuff I use:
p.s sorry for the image quality, I used my son's cheepo cam.
Rich
Simon Barsinister, Sun Oct 22 2006, 08:27PM
This is the stuff I use:
p.s sorry for the image quality, I used my son's cheepo cam.
Rich
Re: Colourless varnish required
Sulaiman, Mon Oct 23 2006, 01:05AM
I've been looking at RS components varnishes/coatings
and it looks like I'll use either Acrylic or Silicone resin
Sulaiman, Mon Oct 23 2006, 01:05AM
I've been looking at RS components varnishes/coatings
and it looks like I'll use either Acrylic or Silicone resin
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