Electronics Forum | Mon Dec 17 08:34:58 EST 2012 | emeto
I would scrap it. As you said part of it is going to be old paste. All manufacturers don't recommend mixing old with new paste because you change the rheology of the paste.
Electronics Forum | Thu Apr 03 22:56:48 EDT 2008 | davef
Potential impacts of using expired solder paste are [University of Bolton]: * Changed paste rheology. Result: poor print quality * Loss of solvents. Result: reduced flux activity * Changed flux formulation. Result: More difficult to clean flux residu
Electronics Forum | Thu Jan 03 02:26:12 EST 2002 | arzu
Hello, I need to know the volume spread of solderpaste after screenprinting fine-pitch paste using a nickelformed screen. It is the end-result that counts , so of course the spread of metalcontent in the paste is important too. Can anyone tell me som
Electronics Forum | Wed Sep 23 12:16:17 EDT 2009 | davef
The US EPA has a Toxics Release Inventory (TRI) program. They may have some information on paste wastage estimation for leaded pastes.
Electronics Forum | Thu Apr 26 11:40:10 EDT 2007 | CL
Good Morning, We have a 3D solder paste inspection machine. We purchased it on a recommendation from a consultant. We are a CM high mix low volume. The President of my company has attended some seminars and meetings where it was conveyed to her that
Electronics Forum | Fri Dec 17 08:05:00 EST 2004 | davef
Your solder paste is talking to you, follow its message. Listen to the paste. Be at one with the paste. If you insist on ignoring the message of the paste, add more paste, if you just need to complete the last board or so, but you really should ju
Electronics Forum | Thu Dec 16 18:36:01 EST 2004 | mattkehoe
We use water soluble solder paste. When it gets a little dried out, can we add something to rejuvenate it? Liquid flux? We do not place components, just print and reflow the solderpaste so solderballs, spattering, and other issues like those are of
Electronics Forum | Tue Feb 22 17:57:32 EST 2005 | Austinj
Most solder paste has a shelf life of 1 week at room temperature after opened, if resealed at the end of the shift/day. Most shelf lives are 4-6 months at 40F (refridgerated) or 1 month at room temp (unopened/sealed). Recommended stencil life is appr
Electronics Forum | Fri Aug 08 07:27:43 EDT 2008 | lonta96
Hi, I'm from a semiconductor package assembly, and currently looking for an offline solder paste inspector capable of true volume measurement. Any recommendation for a machine that can measure paste volume on a leadframe (metal substrate)? I found
Electronics Forum | Tue Feb 17 01:12:52 EST 1998 | J.H. Kim
In solder bumping in flipchip technology by splder printing, the precise control of solder volume and height is very difficult. Therefore I'd like to know the solution of this problem. Thanks
