Electronics Forum | Fri Jan 15 11:28:50 EST 1999 | Bob Willis
| | Folk's, | | | | I'm looking for information of how long you cna store a gold finish PCB before building it. I know there are problems with the gold disappearing into the underlying nickle over time / temperature etc but exactly how long do you h
Electronics Forum | Fri Jan 15 14:45:48 EST 1999 | Earl Moon
| | | Folk's, | | | | | | I'm looking for information of how long you cna store a gold finish PCB before building it. I know there are problems with the gold disappearing into the underlying nickle over time / temperature etc but exactly how long do
Electronics Forum | Mon Jul 26 06:32:58 EDT 2004 | cyber_wolf
Grant, The only thing that you really gain from refrigeration is a couple more months� shelf life. Refrigeration also seems to slow down flux separation. I am not sure how your paste consumption is, but we use ours up way before the expiration date
Electronics Forum | Wed Mar 14 17:52:49 EST 2001 | davef
6 Work Life Test 6.1 Obtain a stencil with 15 to 20 rows of a series of 0.025 by 0.050 inch apertures spaced 0.050, 0.040, 0.025, 0.015, 0.010, 0.010, 0.025, 0.040, 0.050 inches apart. See Appendix 1. Source of supply: Metal Etching Technology.
Electronics Forum | Wed Mar 14 22:41:03 EST 2001 | CAL
There are also Process monitoring tools that mount directly to your blades and monitor the paste. Impedance Spectroscopy is the process monitoring theory behind the tool. It works by having good sample data logged that the monitoring tool can compare
Electronics Forum | Tue Dec 04 14:16:32 EST 2012 | eniac
AIM can give a good result, I tried the solder paste from many manufacturer - AIM, Kester, Indium, Koki, Alpha Metals, Heraeus - but I stopped my choice at Kester. For example, right now I have EM907 with date of manufacture in february 2010 (it's ju
Electronics Forum | Tue Jan 16 15:42:45 EST 2007 | slthomas
Now yer talkin'! FTR, I've seen 7 month old (5 month shelf life in a 45� F fridge) WS based pastes in tubes turn to clay and refuse to print through anything less than about 50 mil pitch. This was stuff stored in the fridge per mfr's spec. I suspe
Electronics Forum | Tue Jan 16 10:19:36 EST 2007 | slthomas
Then how do we explain the poor printing performance (appears to be rheology based, paste thickening/drying, poor aperture fill, sticking to the blades, etc.) of paste that has exceeded it's shelf life? You know, the stuff that no amount of stirring
Electronics Forum | Tue Feb 14 09:30:42 EST 2006 | cyber_wolf
Pardon me for being so bold, but I still cannot understand to this day why solder paste thawing is an issue. I am not sure what types of paste you all are using but it has been my experience that the only thing you gain by refrigerating is 3 months
Electronics Forum | Wed Dec 05 11:04:06 EST 2012 | emeto
AIM can give a good result, I tried the solder > paste from many manufacturer - AIM, Kester, > Indium, Koki, Alpha Metals, Heraeus - but I > stopped my choice at Kester. For example, right > now I have EM907 with date of manufacture in > februar
