Amol,
The three day rule came out of our paste manufacturer's spec. Because we run so little leaded product, we wind up throwing a lot of this stuff away. And of course, people now are looking for every nickel they can save. I'm all about saving money, but I just want to make certain we don't compromise the quality of our product as a coincidence.
Leland
-----Original Message-----
From: Amol Kane [mailto:[log in to unmask]]
Sent: Tuesday, September 27, 2011 12:51 PM
To: TechNet E-Mail Forum; Leland Woodall
Subject: RE: Solder Paste Shelf Life Extension
Leland,
After going thru the technet archives, talking to our paste manufacturers, and reading their SOPs for paste handling, we concluded that 7 days at RT was the usable limit (as long as the paste tube/tub is sealed). We have been using that time limit with no paste issues.
How did you arrive at the 3 days? (experimentation, past experience etc?). what I am getting is that there may be no need to re-certify after 3 days
Regards,
Amol Kane | Process Engineer
Catalyst Manufacturing Services, Inc.
941 Route 38, Owego NY 13827
Phone: (607) 687-7669 Extn 349 | Website: www.catalystems.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Tuesday, September 27, 2011 11:42 AM
To: [log in to unmask]
Subject: [TN] Solder Paste Shelf Life Extension
Folks,
Quick question here...
We have a rule here to scrap solder paste after it's been out of the fridge for 3 days. If we recertify and extend the expiration date by first verifying the proper viscosity, is it permissible to return the paste to the jar that was used for the viscosity testing?
Thanks for your help,
Leland
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