Electronics Forum | Fri Feb 24 11:32:29 EST 2006 | inds
In addition to the response from Board House... You WILL see delamination at lead-free temp even during reflow.. more often than not.... sometime manufacturer's try to get aways with it by pre-baking the board to remove moisture..but I think one has
Electronics Forum | Wed Aug 07 08:46:38 EDT 2002 | davef
The time and temperature required for baking moisture from your boards varies according to the conflicting desires to: * Remove enough entrapped moisture. * Desire to retain solderability of solderable surfaces. Search the fine SMTnet archives for s
Electronics Forum | Mon Sep 21 15:45:35 EDT 2009 | boardhouse
Hi Ryan, Standard shelf life for FR4 Non-RoHs & Rohs material with HASL or Lead Free HASL would be 12 months + in a controlled environment. on all RoHs materials over 6 months, we would suggest your board shop run a solder ability test before ship
Electronics Forum | Wed Jul 28 20:56:58 EDT 1999 | Dave F
| Currently, we are baking any PCB before process on SMT, the 'reason' is to dry any possible humidity that could be inner the PCB, it does not matter if the PCB is multilayer or not. We bake PCB's at 107C for 4 hrs and the board must be process into
Electronics Forum | Thu Mar 15 17:28:44 EST 2001 | rentreo
Sounds like a problem I ran into recently. In my case it was a problem with via holes which were used as test points on our in-circuit tester. My problem was caused by moisture in the boards. My cure was a 24 hour bake at 100 deg c.
Electronics Forum | Thu Sep 15 22:23:36 EDT 2005 | davef
Use your board supplier recommendations Specific procedure or guidelines that need to be followed for handling Moisture Sensitive Devices => J-STD-020 & J-STD-033 Is there any paste height/volume requirement for a lead-free process? => You need to
Electronics Forum | Mon Oct 02 05:51:46 EDT 2006 | dave
All, What controls do you have in place for PCB moisture control? If you had a kit of 400 and you ran out of a part which wasnot due in until 6 weeks- do you store the boards in a dry cabinet ? Vacuum seal and store on a rack? Alan...
Electronics Forum | Thu Jun 29 04:50:42 EDT 2023 | SMTA-70263692
This looks like it could be related to oxidation.Do you per-bake your pcb before assembly to remove any moisture inside your board panel?
Electronics Forum | Wed Dec 08 09:53:23 EST 2010 | fönsi
Hello Because of the cold weather, we had some troubles with drying out of printed solder paste on the pcb's. The relative humidity in the air declined below of 20%. We have a process window of store the printed board for maximum 24 hours, but with
Electronics Forum | Mon Jan 06 17:37:54 EST 2014 | hegemon
Make sure you are providing an adequate moisture bake out prior to wave soldering. It sounds moisture related since is so random. I would suggest perhaps 120C for a minimum of 8 hours to drive the moisture out, and then complete your wave soldering
Products, services, training & consulting for the assembly, rework & repair of electronic assemblies. BGA process experts. Manufacturers Rep, Distributor & Service Provider for Seamark/Zhuomao and Shuttle Star BGA Rework Stations.
Training Provider / Manufacturer's Representative / Equipment Dealer / Broker / Auctions / Consultant / Service Provider
1750 Mitchell Ave.
Oroville, CA USA
Phone: (888) 406-2830
.gif)
