Is this a TechNet Rohrshach test?
Doug Pauls
Principal Materials and Process Engineer
Rockwell Collins
On Fri, Sep 14, 2018 at 9:46 AM Steve Gregory <[log in to unmask]> wrote:
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>
>
> On Fri, Sep 14, 2018 at 8:31 AM, lduso - Diamond-MT.com <
> [log in to unmask]> wrote:
>
> > I agree. Even stripping a board completely there will always be some
> > coating left between fine-pitch leads or under components. Normally, it
> is
> > only stripped for repair. Then recoated with 1A33 again.
> >
> > Then again, I have customers tell me to apply 1B31 over parylene.
> >
> > Lloyd Duso
> > Plant Manager
> > Diamond-MT
> > (814) 535-3505
> > www.Diamond-mt.com
> >
> >
> > On Fri, Sep 14, 2018 at 10:24 AM Douglas Pauls <
> > [log in to unmask]> wrote:
> >
> > > I don't know Chris, I would consider scrapping the assembly. 1A33 is a
> > > pretty durable urethane. You can spot strip it OK, but stripping ALL
> the
> > > coating off of an assembly is going to be pretty tough. As Les said,
> the
> > > residues from the stripper can be harmful if not completely removed.
> > >
> > > Doug Pauls
> > > Principal Materials and Process Engineer
> > > Rockwell Collins
> > >
> > >
> > > On Fri, Sep 14, 2018 at 9:19 AM Chris Thierolf <[log in to unmask]
> >
> > > wrote:
> > >
> > > > Humiseal 1A33 UR was applied instead of SR. Vendor suggested removing
> > > then
> > > > re-applying SR conformal coating. If residue is a potential issue as
> > you
> > > > say then the Silicone will trap the residue on the PCB. This is a
> > > problem.
> > > > I will have to do 100% electrical testing to hopefully rule out this
> > > > condition.
> > > >
> > > > -----Original Message-----
> > > > From: TechNet <[log in to unmask]> On Behalf Of Bogert, Gerald L
> > > (Contractor)
> > > > Sent: Friday, September 14, 2018 9:27 AM
> > > > To: [log in to unmask]
> > > > Subject: [EXT] Re: [TN] Humiseal Stripper 1063
> > > >
> > > > September 14, 2018
> > > >
> > > >
> > > > This chemical stripper gel product should only be used as a last
> resort
> > > > for removing Type UR coating when other methods of removal such as
> grit
> > > > blast or use of heat are not viable. If the gel is not completely
> > > removed
> > > > or neutralized by cleaning process, it will leave conductive residues
> > > that
> > > > can cause improper circuit card operation.
> > > >
> > > >
> > > > ________________________________
> > > > From: TechNet <[log in to unmask]> on behalf of lduso - Diamond-MT.com
> <
> > > > [log in to unmask]>
> > > > Sent: Thursday, September 13, 2018 9:05 PM
> > > > To: [log in to unmask]
> > > > Subject: Re: [TN] Humiseal Stripper 1063
> > > >
> > > > Yes and yes. I have used this many times to remove urethane coating
> > from
> > > > customers CCAs. It does work but can be dangerous. Success often
> > depends
> > > on
> > > > the coating, the thickness, and how much of the board is uncoated. We
> > try
> > > > to use the most mild stripper that will get the job done
> sufficiently.
> > > >
> > > > Is complete removal necessary?
> > > >
> > > > On Thu, Sep 13, 2018, 19:57 Chris Thierolf <[log in to unmask]>
> > > wrote:
> > > >
> > > > > Anyone use this on fully assembled PCBs to remove Urethane
> conformal
> > > > > coating? Any risk to components?
> > > > >
> > > > >
> > > > > Chris Thierolf
> > > > > Principal Engineer, EE
> > > > >
> > > > > L3 Power Distribution - SPD Electrical Systems
> > > > > 13500 Roosevelt Blvd.
> > > > > Philadelphia, PA 19116
> > > > > Ph. 215-698-6390
> > > > > [log in to unmask]<mailto:[log in to unmask]> /
> > > > > www.L3T.com<<http://www.L3T.com<> http://www.l3t.com/>
> > > > > [cid:[log in to unmask]]
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>
>
>
> --
> Steve Gregory
> Kimco Design and Manufacturing
> Process Engineer
> (208) 322-0500 Ext. -3133
>
> --
>
>
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