Electronics Forum | Tue Mar 25 08:29:33 EDT 2014 | sara_pcb
Please refer the attached jpegs, The problem is noticed after reflow soldering followed by conventional through hole soldering. Flux used one is MIL Std. Brush cleaning in IPA is followed after each soldering step. regards, R.Saravanan
Electronics Forum | Tue Mar 25 11:43:48 EDT 2014 | sara_pcb
It is Solder Mask on Bare copper, The land finish is HASL as per MIL-PRF-55110G which accepts trace of HASL as acceptable. Wetting is acceptable. regards, R.Saravanan
Electronics Forum | Tue May 22 08:43:05 EDT 2001 | ohboy
Wow! I'm going to apply for something at Desiccare, I think... I found similar things about desiccants, but mostly material related stuff, also some concerns more about the indicator card than the desiccant. Nothing conclusive. At the moment, I
Electronics Forum | Wed Mar 19 08:38:13 EDT 2014 | davef
I can't picture much of what you're saying, not for nothing, I'm just not connecting. During assembly, solder mask can affected by heat and chemicals. Typically this would be during: * Soldering * Cleaning I will tell you this: Not to defend assem
Electronics Forum | Wed May 16 08:48:12 EDT 2001 | ohboy
I been a bunch o' places...! Some good, some bad, re-inventing the wheel in many cases. Our specs are pretty specific in a lot of cases, but that doesn't mean they always get followed. It usually becomes a case of "It's not quite right, but we rea
Electronics Forum | Tue May 15 21:57:06 EDT 2001 | davef
Welcome!!! Where the hay ya been??? Sorry bud, were lining-up with your fab [it hurts me to say that, but when yer ] We used to dry pack with desiccants, also. Its probably an old MIL-STD-2073-1C requirement [er something like that]. We qui
Electronics Forum | Mon May 21 17:32:23 EDT 2001 | davef
I said: "Our electronic circuit board fabricators seal the boards in moisture barrier bags [MBB]. We discontinued the use of desiccant bags in these MBB because of concerns about the desiccant releasing materials that would affect the solderability
Electronics Forum | Wed Aug 11 18:35:17 EDT 2010 | julie1
Anyone work with or have knowledge about metal core/clad boards? The board I'm working with is approximately 2" X 3/4" aluminum core pcb, in a 56 up array. There are 3 LED placements per board. I'm having trouble getting a consistent screen print.
Electronics Forum | Fri Sep 06 03:06:18 EDT 2013 | 5pcb
We are a complex pcb supplier in China. We are good at making prototypes and multilayer (8-20)layers PCB. If you think your boards are difficult enough, you can contact me. Let's talk details. sales2@dmele.com Name:Lily Tel:0086-0755-23006293.
Electronics Forum | Fri Sep 06 03:11:31 EDT 2013 | 5pcb
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