Electronics Forum | Thu Jun 26 10:02:06 EDT 2008 | rdnggbsss1
I am a PCB Designer and I have to put a note on the assembly drawing to tell the assembler how to clean the board. This is new to me. Here is a sample note. Can someone give me some feedback on it? "Use water washable, no clean solder paste for t
Electronics Forum | Tue Jun 24 13:46:21 EDT 2008 | bschreiber
I know it is not what you want to hear, but first and foremost, you must consult your local regulating agencies and here is why: Solder paste contains heavy metals. We are all familiar with the problems associated with lead, but lead free solder pas
Electronics Forum | Fri Feb 13 12:16:05 EST 2004 | Mike Konrad
Ashok, It is most likely not the DI water that is attacking the aluminum rather it is the saponifier. DI water is only in contact with the parts for a relatively short time. If your cleaning process provides for a rapid drying cycle, you should be
Electronics Forum | Sun Jun 10 23:49:17 EDT 2001 | Robert Sykoh
No-clean is definitely a cheaper process. It will eliminte cleaning. Some issues associated with no-clean are: -- the flux stain left behind on the PCB will create a cosmetic issue. You may want to seek advice from your customers. -- next, the flux
Electronics Forum | Sat Aug 25 12:22:30 EDT 2007 | erokc
Is it sufficent to simply put meter probes in the water to get a resistance reading? I'm very skeptical of the Culligan man as they tried to pass distilled water for DI water. As I watched my container being filled I asked how they determined when
Electronics Forum | Fri Apr 02 11:18:02 EST 1999 | Scott McKee
| | We've been using a newly installed DI re-circulating system. | | It's been a big headache. Mostly understanding what causes our resistivity to be unpredictable. I think I've got a handle on that part now. The system consists of a Carbon,HMR(cheal
Electronics Forum | Mon Sep 09 19:17:56 EDT 2002 | dragonslayr
steve- once again I mention that the lead that is actually in the water is in solution i.e. the lead is in a molecular form that has attached to a H2O molecule. To have a minimum of lead that is below the regulated ppm, there cannot be any chunks,
Electronics Forum | Fri Jul 23 14:41:41 EDT 2004 | Steve Stach
Dear JSK, It sounds like the root causes of your problem are two fold. First, excessive heat will polymerize the abietic acid found in rosin forming neo-abietic diamers and polymers which are much less soluble than the parent monomer. There are
Electronics Forum | Thu Sep 14 11:39:59 EDT 2000 | Steve Thomas
Ahhhh, Dave, I'm glad I can still count on you for some real cutting edge info. yuck, yuck. Believe me, there's a lot more information available on how to resolve no-clean issues than there is on how to keep this stupid board wash/DI/Stencil wash/
Electronics Forum | Fri Sep 15 09:24:54 EDT 2000 | C.K.
At my last place of employment, that was the big reason why nobody (especially the Design Engineers) bought into a no-clean process - interference with high-impedance circuits. One guy was so paranoid about flux residues remaining on the board, that
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