. . . . . . . . . .. . .. .. .. . . . . . . . . . . ..
. . .. ..tX8SX888@@@@88X:88S; . . . . . .
. . . . . tX 8 @S @ 8 8 8 @XX8 @8t . . . .
. . . :@XX88 @88S88SX%X%X%888X 8X@ @ %.. . . . . .
. . . ..888 8 8X88Xt:@[log in to unmask] 8.8:%;.%S 8888@8X %.. .
. . .. ;888 888%8;[log in to unmask] [log in to unmask]:;%S88X888S .. . . . .
. . :%88 8S8;@8@@S8:8:8.8.8.8.8.8:8%@888X888S@8@8;.
. . ..@88 %88@8%%SXS@t8888;8:8:@888.S8XStS8@8@S8@8888.. . . .
. .%@ 88S8S88888@@@XSX@tX88888;88X@X@SS@8888SS888888%.. .
. .:88 88888X888@8X;t8%88@888888888@8X;;8St: 88;@t88X@8t . . .
. ;888 S88@88@8X888t88888888888X8%8888t888t8%@XXt8888888X . . .
. .:8@8X8888888@@8X8S8%8S8S8X8X8S8@8S8X88%8%8%8@XX888888888S .
. ;@8888@888X@@@XX@8X@S8%8@@S8@@S@S8%8S@t@8X@XX@8S888X@8888; . .
. %888X8@8@888888888888@8XS%@XS%@%@X%@S8@8888888%888X@@8888 @ .
. X.. X888888 :888888%;888@XS%XSSSS%XX888 8888888t.88X88888 .: . .
. %8 :S@888t 88X@@XX@X%X8%:XS@%XXX%X%%X@ 8888@XXS::S%XS888@8 %S:.
. @::@@@88% 88S%%ttt%St:%8 tS%%S%SSS%8S:88SS%tttt%;:t8S 88888.8t..
. %. X8 8 [log in to unmask];8S.SX%t%tX@8S@S%S% 888SS%%:;XS.@88 t8; .
. X8.@88;8;@%X:@X:..:S8t;.X;8SS@S%SS8S8XSX:8S::..S8t; @tt@[log in to unmask] .
..X X8@@;X%S:8;:..:;@t; %;tXS%@S%X8X8XSS:8::..:t@t; X%%88X.%8S . .
. S%8. % 8.@SS%X 8;;@;tS::8 .%S@%%SX:.8@SSS@ @:;X;%S:.888X8 ::St .
. %8.8..t88:8SS%;%@X%SS%%8 8 @XS8SXX888SXSS%t%8X%SSt;8X 88 ;8%8; .
..%::%;X8@X@;8SSSSSXSSSX8 8 88XSXX8S@88%@SSSSSXS%SX@% @8X.@888::
. 8%;8 . 88@;8@@XXX88:X@;[log in to unmask]: .:tttS@.. .
8%8.%88 8888@8@XX@888S 8X@X8SX@8X8X@@@@8888@@8 8888:8:t @%8..
8S888.;8 8 @88 8X888@@88X8@X@[log in to unmask]@ 8 ::::%%88 . .
. .X88.%%8 :8 ;.8 @ 888888X8@88@88@88888888 @ @ 88888.8tX8S. . .
. ;S88 t88.t;8 X 8888888888@88888@888888X88 :@ @ .;%S8@t:: .
. :8t8.t88 @8 X888888888888888888888888 8 @ ;8. @t8S::...
S % :8 .;@ X888;X8X888S8@S88@88888@8 X;t88. 8S ;. . . .
. :8S: 8:8;;;X.X8X88X@8t@8888X%8X8@88@8 @.;t@@:;;XtS;.. .
. ..;:88.S88: X8 X8 8%8tS.8tS.8:X88888X.%S; %88.%.:: . .
. . ..: X88.8t :[log in to unmask]@8X X X 888.8t:8:%S88.:.... .
. . %X X XSt8tt;@ :.X.X .X.:X;X.t:@.t88:8;S:.. . . . .
. . . . ; %X8t888@ .tSS%8.t; t: %S8t8X.tXXt@;.. . . . .
. . .; tXS8888X:@.%Xt @8;X;:.8.8@;: ... . . . . .
. . . ...; %@@8 888tS:S;88.88@ S; . ... . . .
. . . . . .:: ; t .;:;.... . . . . . .
: . . . . . ... . .:... . . . . .
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]]
> > > > Confidentiality Notice
> > > > This Electronic mail transmission is confidential, may be privileged
> > > > and should be read or retained only by the intended recipient. If
> you
> > > > have received this transmission in error, please immediately notify
> > > > the sender and delete it from your system.
> > > >
> > > >
> > > > Beginning April 1, 2018, L3 Technologies, Inc. will discontinue the
> > > > use of all @L-3Com.com email addresses. To ensure delivery of your
> > > > messages to this recipient, please update your records to use
> > > [log in to unmask]
> > > >
> > >
> > > Beginning April 1, 2018, L3 Technologies, Inc. will discontinue the use
> > of
> > > all @L-3Com.com email addresses. To ensure delivery of your messages to
> > > this recipient, please update your records to use
> [log in to unmask]
> > >
> >
>
--
Steve Gregory
Kimco Design and Manufacturing
Process Engineer
(208) 322-0500 Ext. -3133
--
This email and any attachments are only
for use by the intended
recipient(s) and may contain legally privileged,
confidential, proprietary
or otherwise private information. Any
unauthorized use, reproduction,
dissemination, distribution or other
disclosure of the contents of this
e-mail or its attachments is strictly
prohibited. If you have received
this email in error, please notify the
sender immediately and delete the
original.
|
