Electronics Forum | Sat Sep 25 03:44:38 EDT 2004 | GS
Thanks Davef, unfotunately in order to keep TIC of PBA inside our customer TIC requirements, we have to pre-wash (DI water only)connectors before assembly. Too high level of Br- continuosly get released by connectors molding compound. Our assemb
Electronics Forum | Fri Dec 01 16:02:33 EST 2000 | Jim M
Thanks for your reply. I 've tried to clarify and answer your questions. The water soluble paste used is WS3060, type 4. The boards are sent through a inline di cleaner after reflow. There is a hot Di waterwash, rinse and then hot air to dry the wa
Electronics Forum | Thu May 13 20:38:32 EDT 1999 | lima
Does anyone know of any industry guidelines for the exhausting of volatiles in reflow ovens? I've seen some numbers like 1,000ppm for the oven atmosphere, but is this typical? My concern is the volatiles in my WS629 solder paste may be attacking th
Electronics Forum | Tue Aug 21 21:39:19 EDT 2001 | davef
1) why is No-clean (NC) the preferred process, for BGA mounting by SMT? Probably the same reason NC is the preferred process for mounting non-area array SMT components. 2) why is water-soluble (WS) not a hot choice? There�s not reason not to use
Electronics Forum | Wed Feb 26 13:15:52 EST 2003 | Mike Konrad
The specific answer depends on what your specific application includes. #1: What are you removing? (solder paste, adhesives) #2: What are you cleaning? (stencils, screens, misprints, pallets) #3: What type of machine are you using? (Spray-in
Electronics Forum | Wed Dec 19 02:24:40 EST 2001 | ianchan
Did I mention, we tried to use the same WS flux formulae to brush-cover the affected flex-PCB pads, and subject it to another round of water-wash, followed by oven-baking, and it still doesn't help abit? Oven bake : 100 deg-C, approx 15~30mins (manu
Electronics Forum | Fri Nov 17 14:42:06 EST 2006 | billwestiet
Mark, This is a big topic. Where are you located, it would probably be best to hook you up with someone in your area. Anyhow, lead or lead free should be based on whether the circuits are lead or lead free. I would guess that cell phones would all
Electronics Forum | Fri May 14 00:16:28 EDT 1999 | Mike D.
| Does anyone know of any industry guidelines for the exhausting of volatiles in reflow ovens? I've seen some numbers like 1,000ppm for the oven atmosphere, but is this typical? | | My concern is the volatiles in my WS629 solder paste may be attack
Electronics Forum | Tue Oct 09 12:23:07 EDT 2001 | Mike Konrad
Hi Danial, Yes, you can use one cleaning chemistry for all paste types. There are many available chemistries from many manufacturers. The chemistries that I would recommend include: StencilWash Plus from Aqueous Technologies http://www.aqueouste
Electronics Forum | Mon Sep 27 08:52:11 EDT 1999 | Brian
| i had a problem here, during the wave soldering process, we apply a water soluble mask on the gold finger to protect it from contamination. But after washing, there is still some mask left on the gold finger. | Can anyone pls advise is there any pa
