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PICList Thread
'[OT] PCB coatings and their solvents'
1998\12\05@175542 by Don Holtz

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Hi!

Does anyone know what kind of solvent would work for cleaning/dissolving
the green conformal coating that is used to stop oxidation on most
commerical PCB's.

I often need to do small repairs on PCB's.  Currently I scrape the coatings
off which can be difficult, and dangerous (for fear of damaging the board
too much).

It would be great if I could use a cotton swab to clean the board in the
vicinity of where I will be working!  I have tried MEK (Methly Ethly
Keton), Xylene, Ascetone, and Laquer Thinner - none of which seem to affect
the green coating!

Cheers, and thanks!

Don

1998\12\05@192131 by Gabriel Gonzalez

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Try N-methyl pyrrolidone, this may work, or call Dynasolve at (201)
887-9270, they will have something for sure. I don't know if they sell to
individuals.

Calvin


{Original Message removed}

1998\12\06@102225 by Mark A Moss

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Steel wool might work.  If the steel wool can't remove the coating, try a
Dremel.  This requires extreme care to avoid grinding completely through
the trace.

Mark Moss
Amateur Radio Operator, Technician, and General Tinkerer


On Sat, 5 Dec 1998 14:53:27 -0800 Don Holtz <spam_OUTdaholtzTakeThisOuTspamAXIONET.COM> writes:
{Quote hidden}

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1998\12\06@105634 by Brian Aase

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IIRC, the green solder mask coating is a heat-cured polyamide
epoxy that is not likely to yield to any kind of "polite" solvent.
Ther are solvents that will take it off, but they are *very* nasty
and are likely to eat into the actual PCB laminate as well!
Check out http://www.dynaloy.com for an overview of these.
Most of us rely on the good old x-acto knife as the safest and
most convenient removal method.


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1998\12\06@114934 by paulb

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Mark A Moss wrote:

> Steel wool might work.  If the steel wool can't remove the coating,

 Steel wool in a *small* ball held in stout tweezers.
--
 Cheers,
       Paul B.

1998\12\07@055545 by Jochen Feldhaar

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Hi Don,

this layer is printed on in near liquid form and then BAKED at almost 200
¡C, almost the same way as a car body paint job. So it is altered
chemically to withstand the stress during the soldering process.
So far I have not discovered a solvent for this thing. But if you heat the
PCB to more than 100 degrees, the layer will become easier to scratch off.
I don't know any other method if it's industry standard stuff..

Greetings

Jochen DH6FAZ

1998\12\12@144202 by Craig Lee

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Oven cleaner?


-----Original Message-----
From: Don Holtz <.....daholtzKILLspamspam@spam@AXIONET.COM>
To: PICLISTspamKILLspamMITVMA.MIT.EDU <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Date: Saturday, December 05, 1998 2:54 PM
Subject: [OT] PCB coatings and their solvents


{Quote hidden}

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