Issue is the it is potentially as bad as applying a very acidic flux and taking a risk that it will all not be washed off afterwards.
Caustic can be very unforgiving (corrosive & conductive) if not removed.
~ Like using oven cleaner on the assembly.
Rich Kraszewski
Senior Staff Process Engineer
Plexus
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D
Sent: Tuesday, July 17, 2018 1:28 PM
To: [log in to unmask]
Subject: Re: [TN] Urethane Coat Remover
Pardon my ignorance, but what is the issue with the stripper having potassium hydroxide in it?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, July 17, 2018 11:55 AM
To: [log in to unmask]
Subject: Re: [TN] Urethane Coat Remover
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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