Electronics Forum | Mon Oct 02 06:41:53 EDT 2006 | saaitk
We have a customer enquiry that requires PCB assemblies to be cleaned to J-STD-001 / -004 class 3. We use both water based and no clean process chemistries. No clean flux residues are not permitted and would therefore have to be cleaned. My question
Electronics Forum | Mon Oct 30 14:27:49 EST 2006 | pjc
Not really. A new Electrovert AquaStorm 100, in-line machine, is under $60K, for straight aqueous applications. The batch type from Aqueous Tech are like $35K I believe. $120K would be for a high performance in-line machine, such as the AquaStorm 200
Electronics Forum | Thu Mar 01 17:56:18 EST 2007 | darby
Tested recently on ENIG finish. profile as follows 100-150, 57 sec. 150 210, 46 sec. 210 + , 63 sec. Peak 231. This profile was developed for this paste as per Asahi literature. Operator said it "looked wet and smelled good"! Print quality was excel
Electronics Forum | Mon Mar 31 09:16:41 EDT 2008 | davef
What is changing the marking on the part? * Is flux residue coating the part to change the the way light reflects from the part surface? [Run a board with tape on the part, then remove the tape prior to AOI] * Is the heat of the oven changing the mar
Electronics Forum | Wed Apr 30 07:33:12 EDT 2008 | davef
It's not acceptable to us. More importantly, you need to determine if it's acceptable to your customer. Recognize that your little IPA scrub does NOT remove the OA flux residues from the board. It mearly spreads them out across the board and under c
Electronics Forum | Tue Jun 24 12:42:35 EDT 2008 | slthomas
Your flux residues may be acceptable for your drain, but the solder balls won't be. You'll need to filter and dispose of the filters per your local city, county, and state regs. Either that or just boil the water off and dispose of the dry remains wi
Electronics Forum | Wed Aug 27 18:28:29 EDT 2008 | blnorman
We have an immersion silver board that has a brown discoloration after processing. It's not flux residue, that normally doesn't cause this condition. Elemental analysis shows less than 1% sulfur, and I thought silver sulfide is more a black color.
Electronics Forum | Sun Nov 22 19:59:26 EST 2009 | prodivegsr
Hi Davef, The bubbles occurs at the body also...there's also a washing process before the conformal coating:-the Flux residue are removed after washing. ... The curing profile is also something that we are looking into during the initial troubles
Electronics Forum | Fri Nov 20 14:50:13 EST 2009 | davef
One of our instruments has a high impedance front-end. We: * Passed functional test in the environmentally controlled shop. * Failed test, on the same unit, while carrying it to burn-in chambers in an uncontrolled part of the plant. Solder flux resi
Electronics Forum | Sat Nov 21 01:42:28 EST 2009 | Sean
Hi Patric, You are right...WE found that this problem disappear once we seal the PCBA bottom side (Intel's Northbridge area). Once we remove the seal, the problem is coming back.. In this case, I thnk conformal coating is necessary... Besides, I
