Electronics Forum | Tue Sep 21 10:53:53 EDT 2004 | davef
We know nothing about Envivar UV 1244 and you weren't real clear about the details of the problem or the materials [eg, ws flux, solder mask, etc], but we'd speculate your adhesion problem goes back to the cleanliness of your board. First by 'alcoho
Electronics Forum | Wed Sep 07 16:53:15 EDT 2005 | GS
Contact Cookson Electronic, they can support you with OSP solutions (ENTEK---) new formulations for Lead Free apllication. Regards GS --------- from a 2003 Cookson presentation: Objective Although Existing ENTEK� PLUS CU106A technology is suc
Electronics Forum | Fri Jan 10 15:02:03 EST 2003 | John
Hi. I am familiar with the Transition blades. Normally, when there is metal to metal contact, as in the squeegee-stencil situation, there will be scratches, or a "brush pattern". Sometimes it takes the pattern of the high profile surface elements u
Electronics Forum | Sat Sep 08 08:55:24 EDT 2007 | davef
We expect to see a copper shadow along the edge of pads when soldering boards with organic solderability protection [OSP]. IPC-A-610 has defined this as acceptable for years. During early reflow stages, the flux in paste dissolves the OSP where ther
Electronics Forum | Wed May 27 21:05:30 EDT 1998 | Steve Gregory
Hey yooze guys! Enough of the jokes between you and Earl (GRIN), let's get back to the topic...well, okay... you can tell a few more...(but good ones, 'kay?) Anyhoo...I'm not sure if ya'll are on the IPC Technet list or not, I've not seen any posts f
Electronics Forum | Fri Jun 27 10:27:59 EDT 2003 | davef
Since you�re asking the question about proper handling of OSP board, there may still be time to talk you out of using that material. * Cleaning of mis-printed board could cause non-wetting problems. This tends to remove a fraction of OSP coating. 0.3
Electronics Forum | Mon Oct 16 20:29:32 EDT 2000 | Dave F
Jason: How did you determine that the deposits are tin oxide? What does this stuff look like? Klein Wassink "Soldering in Electronics" (p. 221, quoting original work by others). States (in effect) tin (or solder) quickly forms a protective oxide
Electronics Forum | Fri Apr 07 17:17:55 EDT 2000 | Dave F
Ashok: You should select and use low residue tapes. But ya know, ya go out and research a great tape and if yer not careful, the buyer will second source ya and (surprise) ya got residues again. We have found that Lemme say this about Katon tape
Electronics Forum | Mon Apr 26 11:04:53 EDT 1999 | Dave F
| | Earl said, in essence: | | | | | Justin is absolutely right ... | | | | | | Again, Entek is not much more than a flux coating ... | | | | | | Metallic coatings protect best, as we all know - especially those electroplated. Those coatings chemi
Electronics Forum | Thu Mar 09 16:56:19 EST 2000 | Dave F
Ashok: If I was to count, I'd guess there was more than 4 subquestions. Hey, but who's countin' anyway? I have answer (s) "on ESD all related to use of wood in a typical PCB Assembly line:" Before pushing-on, it is only "a typical PCB Assembly li
