Electronics Forum | Tue Jun 30 13:20:10 EDT 2009 | charliedci
He wants to "see underwater"
Electronics Forum | Thu Jun 11 22:57:45 EDT 2009 | davef
NASA recommends baking a PCB for a minimum of 4 hours at 93+/- 5.5�C before conformally coating. [NASA-STD-8739.1, �Workmanship Standard for Staking and Conformal Coating of Printed Wiring Boards and Electronic Assemblies,� August 6, 1999]
Electronics Forum | Wed Jun 24 05:08:37 EDT 2009 | Mark
Try immersing the assembly in IPA for 30 minutes. IPA is hydroscopic ans will drive off most of the water. Dry the assembly. Then bake at 110°C for 2 hours.
Electronics Forum | Wed Jun 10 22:47:17 EDT 2009 | davef
You're correct that JEDEC J-STD-033 defines baking condidtions for moisture sensitive components. Why do you want to bake assemblies after cleaning? Search the fine SMTnet Archives for threads like: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Me
Electronics Forum | Fri Aug 06 10:07:50 EDT 2004 | blnorman
OSP has limited elevated temperature exposure capability. Couple that with the fact that solvents (IPA in particular) will remove the OSP. The more material you loose the higher the chances for pad oxidation. We ran an experiment with board washin
Electronics Forum | Thu Jun 25 20:01:54 EDT 2009 | davef
Shanelo Technologies Given that isopropyl alcohol [IPA] is produced by combining water and propene. How does soaking a board in water and a flammable liquid drive off water?
Electronics Forum | Wed Jul 01 05:26:31 EDT 2009 | kpm135
But the boards and parts on the boards are also hygroscopic(no not a typo I did a search on hydroscopic and it is not a word the actual word is hygroscopic look it up if you don't believe me) so if you have two hygroscopic materials which one wins?
Electronics Forum | Tue Jun 09 18:44:20 EDT 2009 | dyoungquist
We are using a water soluble flux which requires the assemblies to be cleaned in an ultra sonic cleaner after assembly. Is there a standard that specifies how long the assemblies need to be baked/dried after being submersed in a water solution for a
Electronics Forum | Thu Jun 11 10:02:36 EDT 2009 | dyoungquist
Our cleaning process involves the assemblies being completely immersed in the water bath of the ultrasonic cleaner. The assembly has a QFP44 on it. Customer stated that when these assemblies have been cleaned with water in the past (at a different
Electronics Forum | Thu Mar 25 09:27:08 EDT 2010 | stepheniii
Thanks I guess I got used to google where the "and" is implied. I searched various combinations and all I could find were threads regarding the pcb's not the components. Does anyone bake their boards after wash before second reflow because of MSD c
