Electronics Forum | Thu Jul 18 21:04:06 EDT 2002 | davef
So, why can't you clean misprints on Entek boards? Entek: Cheap, flat, OK shelf life, not without process and fabrication issues. Your Entek organic solderability protection is probably Entek Plus [CU106A] made by Ethone OMI. Consider getting a co
Electronics Forum | Tue Mar 09 18:04:34 EST 2004 | davef
Obviously, if your customer instructs you to use a certain flux type, using THAT flux type is probably a good idea. Responding to your question: Chloride is one of the more detrimental materials found on printed circuit assemblies. Chlorides can com
Electronics Forum | Tue Aug 15 20:41:54 EDT 2006 | davef
Alpha UP78 was a modern solder paste. Check with your supplier for recommendations. You're are cleaning some flux residue with the IPA and reducing the leakage current. We're not wild about using IPA. Problems with IPA are: * IPA / material being
Electronics Forum | Fri Nov 03 11:30:29 EDT 2017 | davef
regarding dwl comment, "For low volume hand assembly, deionized water or IPA should work fine." Deionized water: Deionized water is corrosive. It needs to be removed. Proof? Drop a copper coin into a covered jar of DI water and watch what happens ov
Electronics Forum | Mon Feb 25 21:13:12 EST 2002 | davef
No, none of us can tell you what is the acceptable level of halide content or contamination in flux residue. The level of harmful residues on your product helps determine the reliability of your product. We know nothing of your product, its custome
Electronics Forum | Thu Jan 14 15:10:14 EST 1999 | Earl Moon
| | Hi Folks. Has any Process Engineer here done a complete evaluation or controlled experiment for VOC-FREE Flux? Our goal here at CEBUKid, Inc. is to implement a VOC-FREE process. We have all the necessary (OPTIFLUX) spray equipment, and we're c
Electronics Forum | Sat Jan 27 08:45:43 EST 2007 | davef
[clipped] Chemistry of Hard and Soft Water From Anne Marie Helmenstine, Ph.D., Your Guide to Chemistry. Water Works I'm sure you've heard the terms 'hard water' and 'soft water', but do you know what they mean? Is one type of water somehow better th
Electronics Forum | Mon Apr 17 19:46:39 EDT 2000 | Dave F
Murad: Your customer is smart to be concerned about the affect of changing production processes on product reliability. Your Company is smart to inform customers and keep them in the loop about these changes. In developing your demonstration of th
Electronics Forum | Thu Nov 13 17:18:11 EST 2003 | davef
First, don�t get distracted by �OA� and �NC� formulations. This is nomenclature. We want to discuss the issue of �activity�. J-STD-004 "Requirements for Soldering Fluxes" classifies fluxes by their chemical composition, activity level and halide c
Electronics Forum | Thu Aug 24 09:23:29 EDT 2000 | Dr. Ning-Cheng Lee
You are asking a very good question which has been an issue in the industry for a long long time. For operating at 225C, you will need a solder with melting point no lower than 270 or even 280C. HMP solder is very difficult to come by. At this stage,
