Ah...you are right, I did not see the subject line in the email.
Oh well...is all good :)
Ken
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Monday, September 21, 2009 1:49 PM
To: [log in to unmask]
Subject: Re: [TN] silicone conformal coat removal
The original question was removal of silicone-based conformal coatings. See the subject line.
Not a rough crowd, just engineers wanting to make sure nothing bad happens. Sorry if I came across the wrong way.
-----Original Message-----
From: Kenneth Wood [mailto:[log in to unmask]]
Sent: Monday, September 21, 2009 11:28 AM
To: 'TechNet E-Mail Forum'; Stadem, Richard D.
Subject: RE: [TN] silicone conformal coat removal
Wow...rough crowd in here.
The original question was "Is there a solvent that will help remove silicone coatings?”
There was no mention of conformal coating...
Maybe he is removing a silicone coating from his desk or screwdriver :)
Ken
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Monday, September 21, 2009 11:57 AM
To: [log in to unmask]
Subject: Re: [TN] silicone conformal coat removal
Thanks. Underscores my earlier posting; refer to the IPC recommendations for conformal coat removal. Go by the industry standards. Avoid "everybody's" ad hoc toilet cleaners, unsafe chemicals, untested methods, etc.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, September 21, 2009 10:48 AM
To: [log in to unmask]
Subject: Re: [TN] silicone conformal coat removal
nPB is n-propyl bromide or 1-bromopropane, a substance that is
ozone-depleting, but unfortunately unregulated under the Montreal
Protocol. It is also a reproductive toxin, reducing sperm count and
motility, and a neurotoxin, with anecdotal cases of severe effects. The
US EPA have strict regulations how it can be used with recommended
exposure values. OSHA have not officially pronounced on it. Various
authorities have suggested exposure levels between 1 ppm and 100 ppm. My
opinion is that a time-weighted value of 10 ppm may be OK with a ceiling
short term exposure of 25 ppm. Every effort should be made to prevent
evaporation into the atmosphere. Make sure that there is no skin
contact, as it would seem that there may be considerable transdermal
absorption and it is not known how such absorbed solvent is metabolised.
Brian
Stadem, Richard D. wrote:
> What is nPb?
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Charlie Pitarys
> Sent: Monday, September 21, 2009 9:47 AM
> To: [log in to unmask]
> Subject: Re: [TN] silicone conformal coat removal
>
> Guy, a cold soak in nPb will work. Trade offs are with the thickness of
> the
> coating and it still may require some manual work or you could luck out
> and
> it may swell and completely lift off the substrate.
> Then of course you have the disposal issues.
> Positives, It is relatively cheap and may suffice in this recovery
> process
> and at room temp should fare well on many components compatibility.
>
> ________________________________
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
> Sent: Monday, September 21, 2009 8:52 AM
> To: [log in to unmask]
> Subject: [TN] silicone conformal coat removal
>
> Is there a solvent that will help remove silicone coatings?
>
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