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| February 10, 2012
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Circulation Over 51,000
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July 31, 2006
Do we have to process a 2 side SMT boards within 24 hours of breaking the seal on the packaging?
The question is in regards to Immersion Silver Board Finish and it is a leaded process. Do we have to process a double side SMT board within 24 hours of breaking the seal on the board packaging. Our room is environmentally controlled.
Ray Whittier
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Immersion silver board finishes are very susceptible atmospheric reaction but not normally form oxygen. Sulfur is the killer of immersion silver. I have been in manufacturing facilities near highway on ramps where silver will tarnish with in on shift due to the sulfur from car exhaust. If you have a clean area and low sulfur you have a wider process window than 24hrs. But it is still recommended to keep control of these boards.
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Karl Seelig
Vice President of Technology
AIM
In his 25 years of industry experience, Mr. Seelig has authored over 30 published articles on topics including lead-free assembly, no-clean technology, and process optimization. Karl holds numerous patents, including four for lead-free solder alloys, and was a key developer of no-clean technology.
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