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January 2012

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Subject:
From:
Karen Tellefsen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Karen Tellefsen <[log in to unmask]>
Date:
Mon, 16 Jan 2012 15:40:15 -0500
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sorry wrong email
Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069



                                                                            
                                                                            
                                                                            
   Re: [TN] Expired Solder Paste                                            
                                                                            
                                                                            
   Karen Tellefsen                                                          
                  to:                                                       
                     TechNet                                                
                                                        01/16/2012 02:54 PM 
                                                                            
                                                                            
                                                                            
                                                                            
   Sent by:                                                                 
          TechNet <[log in to unmask]>                                         
   Please respond to TechNet E-Mail Forum, Karen Tellefsen                 
                                                                            
                                                                            
                                                                            






thanks

Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069






   Re: [TN] Expired Solder Paste



   Matthias Mansfeld

                    to:

                       TechNet

                                                        01/16/2012 01:37 PM





   Sent by:

          TechNet <[log in to unmask]>

   Please respond to TechNet E-Mail Forum, Matthias Mansfeld









On 16 Jan 2012 at 8:17, Stadem, Richard D. wrote:

> You can re-certify expired solder paste per J-STD-005 section 6.0.
> Used the form attached therein, and follow the appropriate test
> methods (also listed at the end of J-STD-005, #2.4.34, 2.4.34.1,
> 2.4.34.2, 2.4.34.3 for the viscometer you wish to use. You should
> always perform first article testing, monitor your PPMO, etc., and
> document all product run with the re-certified paste.

For what it's worth, a good solder paste, stored under good
conditions may work well even years after expiration. Been there,
done that without re-certification (don't worry, no customer
projects, just some own DIY-stuff....). For this stuff I use still
the same 1kg-jar with old Sn63Pb Alpha RMA390D3K from 2003.... prints
well, tacky like new, and visually perfect, shiny solder joints...
even 8 years after expiration date.

Best regards
Matthias Mansfeld
--
Matthias Mansfeld Elektronik * Leiterplattenlayout
Neithardtstr. 3, 85540 Haar; Tel.: 089/4620 093-7, Fax: -8
Internet: http://www.mansfeld-elektronik.de
GPG http://www.mansfeld-elektronik.de/gnupgkey/mansfeld.asc


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