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November 2004

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Subject:
From:
"Valenzuela, Michelle (MO)" <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Thu, 4 Nov 2004 18:30:53 -0500
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text/plain (13 lines)
Hello,
New to the forum. Was wondering, with the change to Pb-free soldering (resulting in higher soldering temps, among other process changes) if anyone was seeing problems with their soldering fluids (e.g. blanketing fluids, hot air leveling fluids, solder reflow fluids, solder flux, hot liquid leveling fluids, etc.).  We have heard that some fluids char, smoke, degrade much quicker and cannot withstand the higher temps. My knowledge is limited in the PCB soldering industry (so I apologize for any technical errors); we are trying to help formulators/manufacturers improve the thermal and oxidative stability of soldering fluids to be more compatible with the Pb-free demands. Would also be good to know what peak temperatures these fluids see (240C-270C) in the Pb-free process and how long these fluids see those high temps. Grateful for any info!
Michelle
The Dow Chemical Company

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