Hi Kate,

Stripping Urethane coating as you know is very difficult to strip. If you
have a stripper that works well on the urethane, you then have to be
careful whether or not it will affect any other material on the assembly. I
found one that doesn't have potassium hydroxide in it. I've never used it,
so I don't know how well it works:

https://www.miller-stephenson.com/product/conformal-coating-stripper/

These are the ingredients:

Material
CAS No.                    Approx. %
1,1,1,2,2,3,4,5,5,5-Decafluoropentane (HFC-43-10mee)
138495-42-8               22 - 30%
Trans,1.2-Dichloroethylene
156-60-5                     45 - 50%
Methanol
67-56-1                       4 - 10%
N-Methyl-2-Pyrrolidone
872-50-4                     18 - 22%

When we had a big project where we had to rework a bunch of boards that
were urethane coated, it was an engineering change where we had to remove
and replace parts on boards that were urethane coated we purchased a
micro-abrasion station from a company called CCR Co.

http://www.ccrco.com/

I think I remember it being recommended by a Lockheed engineer. Anyways the
station worked great. The media used in the station is ESD safe which is
something you need to worry about when using a media-blasting station.
Urethane is best stripped when it is aged a bit. When it is freshly applied
the beads tend to bounce off. I remember if they didn't strip well I would
put them into an oven for a few hours to make the coating become a little
harder so it would strip easier.

Steve

On Tue, Jul 17, 2018 at 5:45 AM, Ekaterina Stees <[log in to unmask]>
wrote:

> Hello Technetters,
> Does anyone know of a chemical remover for urethane conformal coat that
> does not use potassium hydroxide as it's active ingredient?
>
> Thanks,
> Kate
>



-- 
Steve Gregory
Kimco Design and Manufacturing
Process Engineer
(208) 322-0500 Ext. -3133

-- 



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