Electronics Forum | Wed Jun 30 18:12:59 EDT 2004 | crios
Thanks for the information. davef, I will search for and review the Ion Chromatography for Ionic Cleanliness test method. This definitely is the test I want to perform. Do you know what the IPC specification is using this test method? The outside
Electronics Forum | Mon Mar 21 09:33:25 EST 2005 | davef
RoHS Substance||RoHS MCV Limits||Typical Testing Approaches Lead||1000 ppm* ||Wet chemical digestion followed by ICP (Inductively coupled plasma) or AAS (atomic absorption) spectroscopy ||||XRF (X-ray fluorescence) spectroscopy Cadmium||100 ppm ||Wet
Electronics Forum | Fri Apr 15 14:06:24 EDT 2005 | saragorcos
Shean made some good points and offered some good starting resources. Adding to what he said, I would also mention that many times, even a no-clean flux can cause contamination that requires cleaning. Our lab has dealt with numerous cases of client
Electronics Forum | Fri Jan 06 09:15:34 EST 2006 | sarar
I would suggest that it would be helpful to perform ion chromatography analysis on some of the boards that have failed your ionograph tests as well as some boards that have passed. This will tell you exactly what ionic species are present on the boa
Electronics Forum | Thu Oct 05 16:04:00 EDT 2006 | GS
I am not expert, just my comment, the total ionic contamination allowed after SMT, by using No Clean process, theoretically it should be close to Zero. Any way the Standard IPC-JSTD-001 allows 1,56 ugr NaCl/cm2 for the final Printed Board assembled.
Electronics Forum | Thu May 31 21:45:48 EDT 2012 | davef
rsthompson ... if you're talking about bare boards IPC-5701, Users Guide for Cleanliness of Unpopulated PBC, Table 8 ||Bare board final surface finish Ions||Hot air solder level||OSP over copper||Gold over nickel Chloride||0.75 ug/cm^2||0.75 ug/cm^2
Electronics Forum | Mon Jun 25 03:52:24 EDT 2012 | awtm
Our Customer had detected tarnished pad on ImAg PCBA and had conducted several SEM-EDX test at the soldermask below some of the chip resistors. High concentration of sulfur was found and it can be significantly reduced after further chemical cleaned
Electronics Forum | Thu Sep 26 15:28:16 EDT 2013 | joeherz
I know - A stimulating topic.... IPC-TM-650 2.3.28 method calls for a PCBA or PCB to be placed into a bag with solution, shake, analyze. Great. There is a method of doing this testing that focuses on a specific area of a PCB or a component where r
Electronics Forum | Wed Dec 09 21:45:11 EST 1998 | Dave F
Graham: I agree. Very thorny. What is clean?? And how is that controlled?? Back 25 or so years ago, soldering was done with high solids rosin fluxes. The issue with cleanliness was ionic contamination. The US military and others set a fairly a
Electronics Forum | Thu Sep 17 11:09:32 EDT 1998 | Dave F
| I need an evaluation process to prove to a customer that our no-clean process does not leave excessive residue? Any ideas? Wayne: More of the same as Chry and Justin. KEY ISSUE The first thing that you need to know is: What does your customer me
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