Electronics Forum | Tue Aug 15 15:48:20 EDT 2006 | Chunks
No longer than when it starts to cause defects unacceptable to company goals and/or objectives.
Electronics Forum | Tue Jan 11 07:46:23 EST 2000 | Dave F
Wolfgang: Boy it's tough to convey context in this medium, isn't it? Clipped from our paste storage work instruction, environmental effects on paste are: 1a Avoid excessive heat (over 80� F). It causes flux separation, reducing print quality. 1b
Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef
Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c
Electronics Forum | Mon Jan 10 12:00:06 EST 2000 | Dave F
First, I agree with Wolfgang, in response to Wister. Second, Wolfgang: Sometimes, our blanket purchase order for paste schedules delivery of the paste in advance of production requirements. (What!!!???? In-bound material schedules don't match out-
Electronics Forum | Mon Jan 08 17:32:47 EST 2007 | Board House
Hi Oswald, Shelf life with ENIG if vacuum sealed and kept in controled enviroment would be 12 to 14 months. Shelf life in shrink wrap - No recomended packaging, 6 moths. If Shelf life goes over the 12 -14 months - Baking ? I would not suggest re-b
Electronics Forum | Wed Nov 09 07:43:12 EST 2022 | micropak
ENIG boards have low shelf life as oxidation starts showing up quickly on the solderable areas. We usually keep them vacuum packed till they are ready to be assembled. Most PCB manufacturers will send them vacuum packed.
Electronics Forum | Thu Nov 10 11:59:31 EST 2022 | dontfeedphils
Probably preform some sort of solderability evaluation on the PCBs.
Electronics Forum | Mon Nov 14 13:47:10 EST 2022 | emeto
kumarb would you just check PCBs for solderability or would you do something in addition?
Electronics Forum | Thu Nov 10 20:39:44 EST 2022 | SMTA-64386598
The solderability shelf life of ENIG is related almost entirely to diffusion of O2 through the gold plating. When O2 diffuses through the gold, the underlying nickel is oxidized rendering it unsolderable (with ENIG - you solder to Ni, the gold dissol
Electronics Forum | Fri Mar 21 11:10:24 EST 2003 | davef
There is no standard. If your boards solder well, they're good. Well soldered boards that have been stored a long time will have field life similar to well soldered boards that have not been stored a long time. The solderability of boards depends
