I would certainly appreciate a copy of this article.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
Sent: Thursday, October 11, 2012 2:21 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal coating removal

I completely agree Brian, I am at a loss to understand where the notion started to employ either Toluene or Xylene.

When I ran HumiSeal Europe we developed a stripper 1080A for 1B31 and its like. I have a tech report we did back in 2005 and I will be happy to supply a copy if anyone is interested.

We could completely dissolve 1B31 in less than 20 minutes.

As regards micro-blasting, we always found that chemical dissolution - if done correctly - was the better solution (sorry, a little Deweyism crept in there!)

Graham Naisbitt


On 11 Oct 2012, at 14:59, Brian Ellis wrote:

> I would MOST decidedly not use THF or even toluene. My choice would be whatever chlorinated solvent is permitted in your neck of the woods. Dissolves acrylics faster than toluene and is non-flammable. As with all organic solvents, good vapour extraction is mandatory.
> 
> Brian
> 
> On 10/10/2012 21:39, Stadem, Richard D. wrote:
>> I also enjoyed working with both toluene and THF to strip coating. Looking down and watching myself work from the ceiling was a cool experience.
>> 
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey 
>> (EHCOE)
>> Sent: Wednesday, October 10, 2012 1:37 PM
>> To: [log in to unmask]
>> Subject: Re: [TN] Conformal coating removal
>> 
>> GDAIS Security Warning:
>> This message was delivered from the Internet. Be cautious about trusting the content, particularly any links or attachments.
>> 
>> If there is any doubt as to the authenticity, forward this email as an attachment to [log in to unmask] for analysis prior to opening any attachment or link.
>> 
>> THF is great stuff. I did a lot of work with it and it never bothered me; what was your question/ what was your question. It never bothered me. It never bothered me.
>> Dewey
>> 
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
>> Sent: Wednesday, October 10, 2012 11:07 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Conformal coating removal
>> 
>> Pat and Ioan,
>> I would be vewy vewy cautious with these.  Yes, they work, but the if it is the one I am thinking of (purple pen body), the chemical is tetrahydrofuran.  The smell of that chemical will knock a buzzard off a manure spreader at 50 paces.  The greater concern is that if you have any residual THF, hitting it with a soldering iron releases some REALLY nasty chemicals.  If you look back in the technet archives, Brian Ellis did a great dissertation of the bad effects of THF pyrolysis products.
>> 
>> On the other hand, you can take those same pens, pull out the fuzzy end, pour out the THF and refill with toluene to do what is needed.  But I still found that once that tip gets a little use, it creates the same fibers Ioan gets from the Q-tips.
>> 
>> Doug Pauls
>> 
>> 
>> 
>> From:   "Goodyear, Patrick" <[log in to unmask]>
>> To:     <[log in to unmask]>
>> Date:   10/10/2012 12:24 PM
>> Subject:        Re: [TN] Conformal coating removal
>> Sent by:        TechNet <[log in to unmask]>
>> 
>> 
>> 
>> Ioan,
>> 
>> We use Conformal Coating Removal Pens made by Trace Technologies and
>> distributed by Tech-Spray.    They are self-contained press tip pens that
>> are about 4"x1/2" contain 12.5 ml fluid and have a wedge shaped felt tip, and we uses either Qtips or Foam tipped swabs to remove the duff. Their website is Techspray.com the part number is 2510-N, the material is also
>> in bulk.    You can maybe mix your own the chemicals are listed.    We
>> purchased some in bulk but the pens are easy, exact, and disposable.
>> 
>> Pat
>> Pat Goodyear
>> Control Technician
>> Pacific Gas and Electric
>> 
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
>> Sent: Wednesday, October 10, 2012 9:56 AM
>> To: [log in to unmask]
>> Subject: [TN] Conformal coating removal
>> 
>> Dear Technos,
>> 
>> We need to locally strip the acrylic coating (1B31S) from a few components, on a few thousands of boards. Right now we're using Q-tips to do the rubbing and, besides having to pluck tons of fibers afterwards, we're also going through a lot of Q-tips.
>> 
>> So the question is: is there anything else we can use, that will be more effective, cleaner and more economical?
>> 
>> Thank you,
>> 
>> Ioan Tempea
>> Ing nieur principal de fabrication / Senior Manufacturing Engineer 
>> [signature002]<http://www.digico.cc/>
>> 
>> 950 RUE BERGAR, LAVAL, QC, H7L 5A1<http://g.co/maps/2gh3f>
>> T+ 1 (450) 967-7100, EXT244
>> ------------------------------------------------------------------------
>>   [signature001] <http://www.facebook.com/pages/Digico/277076778479>
>> ---------------------------------------------------------------------
>> --- Laur at Dunamis 2012<http://digico.cc/dunamis-2012/>
>> Entreprise manufacturi re / Gestion du capital humain
>> 
>> 
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