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-   -   Etch Resist Stripping (http://www.diyaudio.com/forums/parts/63167-etch-resist-stripping.html)

richie00boy 25th August 2005 06:38 PM

Etch Resist Stripping
 
Is acetone any good for etch resist stripping? I've searched and it seems it will strip it, but takes some doing. Am I better off just making up a strong solution of sodium hydroxide?

Magura 25th August 2005 06:49 PM

Acetone strps the etch resist quick and easy. Wet a piece of clothe in acetone and simply wipe off. I never use anything else, too much hassle.

Magura :)

peranders 25th August 2005 06:55 PM

Forget about the acetone.

Drill the board first then use a Scotch Brite sponge or steelwool. Then you will have a shiny copper surface and in the same time all sharp edges from the drilling removed.

bigmike216 26th August 2005 01:48 AM

I use laquer thinner to remove toner. Works great, it just floats right off, no scrubbing.

richie00boy 26th August 2005 07:50 AM

Thanks guys, looks like acetone is the way forward. Should be cheap as well :)

Peranders, I did think about using very fine wet and dry paper or steel wool. Might dip steel wool in acetone and get best of both worlds :)

AudioWizard 28th August 2005 04:58 PM

I use acetone too. Does the job nicely.

Don't forget two things: use acetone in a well ventilated room (avoid breathing the vapors too much) and use rubber gloves. Acetone is harsh on the skin. It won't burn it or anything, but it leaves it very dry, and I suspect it could do more damage over time. So don't take chances.

richie00boy 28th August 2005 05:47 PM

Thanks

AuroraB 28th August 2005 06:15 PM

I normally use acetone, too.... but the positive photo resist usually developed by NaOH, --- appx 14 g to the liter, can be stripped by a stronger NaOH solution, -- appx 50-60 g pr liter..
use a brush to help dissolve the resist
Often I actually use both- acetone first- because i use a chemical tin plating, and the last NaoH strips any residues sometimes left by the acetone, and preps the boards for the tin.
OTOH- at least some of the pre coated boards sold throughout europe, don't need stripping, as the resist can funtion as a solder mask and can be soldered right through.........at least that's what the PR says...

richie00boy 29th August 2005 08:30 AM

The resist is claimed to be solderable/fluxing on the board I use but I find it's a complete lie. What is NaOH? SInterested by your comments as I'm also using a chemical tin plating.

AuroraB 29th August 2005 09:19 AM

NaOH---Sodium hydroxide -. or caustic soda.........
The usual paint shop stuff does the job just nicely.. no need to disturb the chemists....

BTW- I don't trust it either, - as solder mask.....
tin plate.. and/or use some good spray-on stuff...............


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