This 'nPb'  sounds nasty. Methylene chloride isn't very healthy either, but 
I would use that. In fact, methylene chloride takes most CCs. If you can buy 
it. As far as I know, some silicon based coatings don't lift for any 
chemicals.
/Inge


----- Original Message ----- 
From: "Stadem, Richard D." <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, September 21, 2009 5:57 PM
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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