Electronics Forum | Tue May 22 11:38:04 EDT 2012 | naynayno
I am looking for IPC or other published standards that specify cleanliness levels for: 1) solder paste stencils 2) selective solder pallets When we cleaned PCB's we used a limit of 4 M-ohms. Now that we have transitioned to No-Clean, I am wonderi
Electronics Forum | Tue May 22 14:30:54 EDT 2012 | davef
There is no standard, nor should there be. You need to establish a standard that meets your customer requirements. The problem with those old-timey standard is that there's just so many choices. What works for you just might be too strict [or loose]
Electronics Forum | Mon Jun 11 22:06:00 EDT 2001 | davef
The issue is not the cleanliness of your in-bound water. The issue is the cleanliness of the board your customer receives. Look at J-STD-001C, Para 8, "Cleanliness Requirements". The end product cleanliness is the end result of your: * In-bound
Electronics Forum | Tue May 09 11:46:03 EDT 2023 | tommy_magyar
I re-read the comments and it is unclear what will be the resolution applied in your case, neither if you use the stencil washer for misprint cleaning purposes. I am just curious. Are you not using your stencil washer to wash the PCBs too? Thinking i
Electronics Forum | Fri Dec 29 01:25:32 EST 2006 | yusuf
About one year we have that problem with some of pcbs. Our customers told us about that. Because they can't mounting components on those pcb reason of flux residue. As you know flux not conductive chemical. We didn't change anything before having tha
Electronics Forum | Wed Apr 30 19:55:21 EDT 2003 | Mike Konrad
In all likelihood, you may not be leaving flux on the board rather you may be leaving saponifier on the board. Improper rinsing is a leading cause of cleaning related board failures. The problem with some inline cleaning systems (especially old o
Electronics Forum | Fri Apr 05 17:38:54 EST 2002 | davef
We socket no parts prior to the wave. This practice is an artifact of the days when we�d solder PTH socketed parts from the heat of the wave being conducted through the socket leads to the leads of the component. Sockets??? Thaint sockets no more.
Electronics Forum | Thu Jan 23 14:19:56 EST 2003 | Mike Konrad
Hi Randy, No-clean flux needs to be activated in order to burn off the volatiles in the flux. This normally occurs partly during preheat and certainly during the reflow or soldering process. In most hand soldering applications, an operator applies
Electronics Forum | Thu May 30 10:06:20 EDT 2013 | rgduval
In general, it would not be advisable. DI water is used for a couple of reasons. First, the missing ions aid in the cleaning process, as they seek to bond with the material on the board, allowing the water to act like a fairly aggressive solvent.
Electronics Forum | Mon Aug 27 11:20:58 EDT 2007 | davef
Q1: Is it sufficent to simply put meter probes in the water to get a resistance reading? A1: No. You need a meter for the purpose. Myron-L [myronl.com] is one such company Q2: I'm very skeptical of the Culligan man as they tried to pass distilled w
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