Electronics Forum | Tue Dec 28 15:12:03 EST 1999 | Bill Schreiber
Rick, Ultrasonics is a mechanical scrubbing action (cavitation) similar to any other scrubbing action, if you scrub long enough, you stand the chance of wearing away some of the surface material (shiny coating of a solder joint). The shiny coat on a
Electronics Forum | Mon Jan 29 11:52:55 EST 2001 | blnorman
We have been using a VOC-free, no-clean flux on our boards that we conformally coat with no problems. We're using both a UV cured and a heat cured Silicone conformal coating. One thing to beware of is inhibition in the silicone. We found that out t
Electronics Forum | Wed Jul 20 10:07:05 EDT 2005 | cecil
Does anyone have any input on the need to bake out an assembly prior to the conformal coat process? I understand baking out components/pwb's prior to processing through the reflow or wave solder process if the material shows excess moisture absorbtio
Electronics Forum | Fri Apr 25 17:03:34 EDT 2003 | davef
Leaching. Dissolution of a metal coating into liquid solder. Leaching applies to liquid solder and, at times, is applied inaccurately to metallurgical effects, like diffusion, that occur after the solder has solidified. Please help us understand y
Electronics Forum | Thu Aug 31 09:30:42 EDT 2006 | saaitk
GS, Resin choice is really dependant on what you are protecting the PCB from. I would suggest that AR or UR would be the 2 that may be most suitable. Material manufacturers can give some good advice on material properties would be worthwhile giving
Electronics Forum | Wed Jan 31 14:07:24 EST 2007 | electronhose
Material, fumes, cured or uncured, all are suspect. Silicone gets on an operator's hands, that operator handles components ( even a day or more later ) silicone is transferred to the solder connections = contamination. Process and workcell control
Electronics Forum | Thu Nov 15 15:27:50 EST 2012 | davef
Finally, help for those searching for compatibility A new standard and guideline will make it much simpler for users to determine whether they’ve got the right chemistry to ensure compatibility. April 23, 2012 By Terry Costlow, IPC online edit
Electronics Forum | Fri Jun 18 13:55:44 EDT 1999 | Earl Moon
| | Now don't everyone jump on this at once, but it seems time for me to send out copies of my not even close to being dated copy of an article about HASL. Though it was published in 1992, in Printed Circuit Fabrication Magazine, and it got rave revi
Electronics Forum | Thu Jun 05 07:54:20 EDT 2008 | davef
You're correct, uV costs 1.7X solvent-based silicone. This high purchased material cost is counter balanced by uV requiring lower thickness due to higher solids and that 60 to 80% of a solvent coating is volitile and goes up the pipe between applicat
Electronics Forum | Wed Dec 06 19:55:13 EST 2000 | Dave F
it's a "clear" material printed on top of each via [top & bottom side]. Apparantly, there is some color to it so it changes ... * Mask blue from green * Gray stuff in the vias to gray stuff colored [although it may be some other color and the clea
