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Date: Thu, 29 May 1997 17:01:29 -0400
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From: annie laberge <[log in to unmask]>
Subject: Re: Re[2]: LPISM Stripping
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============== Begin part 2 ==========================

     Annie,
     
        I have found that heating the solder mask with a hot air soldering 
     tool will soften the epoxy.  It can than be easily scraped off with a 
     dull (less change of etch damage) Xacto knife.  Be careful not to 
     concentrate the air on one spot for too long.
     
     Gary Camac
     Dickey-john Corp.
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Re: Re[2]: LPISM Stripping
Author:  INTERNET:[log in to unmask] at CSERVE
Date:    5/29/97 5:03 PM


Regarding soldermask stripping...
We are an assembly plant and sometimes we want to remove soldermask (PISM) 
on PCB but just on a small area.
I  was wondering if there is anything that we can use to remove soldermask 
other than physically remove it with "x-acto"   (considering you just want 
to strip a little area on the board; not the entire board.
     
Thanks in advance
     
Annie Laberge
Quality Engineer
Matrox Electronic Systems
     
     
     
At 07:12 PM 5/28/97 -0500, you wrote: 
>     Vince,
>     
>     Is this before or after cure?  I've had some bad experience with 
>     stripping soldermask after being cured, especially batched stripped 
>     versus in-line spray method.  Worse case scenario, conductors lifting 
>     from laminate, expecially in isolated areas.  This was two years ago, 
>     so what has changed?  I currently have a situation with a vendor where 
>     the soldermask is very thick, color is not to spec (no biggy) and 
>     slightly mis-registered (S/M runs on to lands).  Our wireless group 
>     forwarded the PCB's back to the vendor to have the soldermask 
>     stripped.  I was furious when I found this out, due to past 
>     experiences.  Should I still be catious or has soldermask stripping 
>     tremendously improved.
>     
>     John Gulley - Process Quality Engineer 
>     Inet Inc 
>     1255 W. 15th St. 
>     Plano, TX 75075-7270
>
>
>______________________________ Reply Separator 
_________________________________
>Subject: RE: LPISM Stripping
>Author:  "Bob Oliver; Jr." <[log in to unmask]> at Internet 
>Date:    5/28/97 10:31 AM
>
>
>     
>-----Original Message-----
>From:   Anil K Singh [SMTP:[log in to unmask]] 
>Sent:   Saturday, May 17, 1997 11:21 AM
>To:     TechNet
>Subject:        LPISM Stripping
>     
>We are using Coates LPISM could anyone suggest a good  formulation for 
>stripping cured LPISM boards.
>     
>Thanks in advance
>     
>Anil K Singh
>Linaks Microelectronics Ltd, India
>Fax:+91-522-222061, 315978
>      
>*************************************************************************** 
>     
>
>
>
-------------------------------------------------- 
Annie Laberge
-------------------------------------------------- 
Ingenieure Qualite
Matrox Electronic Systems (MES)
Tel: (514) 685-7230 ext 2933
Fax: (514) 685-3415
     
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============== End part 2 ============================

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