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March 2007

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Hernefjord Ingemar <[log in to unmask]>
Date:
Mon, 5 Mar 2007 08:18:18 -0600
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TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
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From:
"Douglas O. Pauls" <[log in to unmask]>
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Well, xylene also works, so does acetone.

Doug Pauls



                                                                           
             "Hernefjord                                                   
             Ingemar"                                                      
             <ingemar.hernefjo                                          To 
             [log in to unmask]>         "TechNet E-Mail Forum"              
                                       <[log in to unmask]>,                  
             03/05/2007 07:50          <[log in to unmask]>       
             AM                                                         cc 
                                                                           
                                                                   Subject 
                                       RE: [TN] Use of Type AR Conformal   
                                       Coating for Military PCBs           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Echo...
Except for Toluene....banned in Europe...we use a Thinner.
Inge

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: den 5 mars 2007 14:36
To: [log in to unmask]
Subject: Re: [TN] Use of Type AR Conformal Coating for Military PCBs

Good morning Les,

Rockwell Collins is one such company.  Many of our military products
require a type AR coating for reworkability.  We have used Humiseal 1B31
successfully on military product for many years.  We have applied by
HVLP spray, automated/programmable spray, dip coating, and brush
coating.  You can get the minimum 1 mil by brush coating with the
as-supplied viscosity.
You have to thin the material to spray, but you can usually get the
minimum
1 mil in a single pass.

Any adverse concerns (e.g., solder joints, solder mask, etc.)?    Not
really.  The biggest concerns are flooding of connectors as the material
spreads and wicks.

Any humidity test results?   Yes.  We regularly pass MIL-STD-810 and
DO-160E humidity testing.

Method of coating removal?  The material dissolves in toluene so most
rework methods involve first dissolving the material in toluene.

Rework using either AR or UR coatings.   We recoat with 1B31 after
rework.
I have not investigated rework with a UR over 1B31.

Doug Pauls





             - Bogert

             <[log in to unmask]>

             Sent by: TechNet
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             <[log in to unmask]>         [log in to unmask]


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             03/02/2007 04:55
Subject
             AM                        [TN] Use of Type AR Conformal

                                       Coating for Military PCBs



             Please respond to

              TechNet E-Mail

                   Forum

             <[log in to unmask]>

             ; Please respond

                    to

                 - Bogert

             <[log in to unmask]>









March 2, 2007

I am seeking info on any military folks who coat their assemblies with
Type AR coating.  How do you apply it/  how many spray coats on each
side of the assembly are needed to achieve the min J-STD-001 thickness?
Any adverse concerns (e.g., solder joints, solder mask, etc.)?  Any
humidity test results? method of coating removal?  Rework using either
AR or UR coatings.


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