Electronics Forum | Wed May 08 11:07:54 EDT 2002 | Carol Stirling
We have a concern with moisture absorbtion/humidity effects on PWBs specifically used for automated SMT (including BGA). I'm sure there is a IPC spec on this and would appreciate the number - I've searched the IPC web-site -no results. Could you t
Electronics Forum | Thu May 09 17:28:33 EDT 2002 | davef
There is no IPC specification, nor should there be. * There are just too many peculiarities in the design and fabrication of PWB. * The issue is not defining how to store boards. The issue setting expectation for reliable products and allowing you th
Electronics Forum | Sat Jun 28 22:52:34 EDT 2003 | ramanandkini
We have an Electromechanical assembly (clock) that has a step motor on the board. This electromechanical assembly is assembled in a screw less plastic moulded casing. The plastic casing is neither air tight nor water proof. The board is with SMOBC+ H
Electronics Forum | Mon May 14 17:16:27 EDT 2001 | slthomas
We use both, cartridges for water soluble and jars for no clean. The only reason we do is so they can't possibly (knocking on my head) mix it up. Pros: Jar - you can put paste back into it if you want to wash your stencil, change jobs after lunch,
Electronics Forum | Mon Mar 30 16:02:44 EST 1998 | Michael Allen
| We have successfully put .016" vias in .030" pads. | There is no issue with .030" solder balls, since | the actual volume of the .002" via in pad is small | compared to the ball+solder paste volume. | We did notice random bubbles where, apparentl
Electronics Forum | Mon Mar 27 15:10:48 EST 2006 | ms
Hi Steve Thanks for your reply. Your comments make it sound like it may be the nature of this paste. Any one else agree? Paste control is fairly good. Paste is put in fridge straight after it arrives at inwards goods, (4deg). Removed from fridge
Electronics Forum | Thu Nov 21 02:43:07 EST 2002 | jate
Hi, Jar's quality is easier to measure. If you want to know paste viscosity etc. it's easier if you use jar. I have bad experiences about cartridges. I used cartridges for a short time but I change it back to jar because flux separated too easily in
Electronics Forum | Wed Nov 06 12:11:29 EST 2002 | russ
On this I was thimking of cartridges and not syringes.
Electronics Forum | Thu Mar 04 14:37:44 EST 2004 | cyber_wolf
Try buying your paste in 500g pyles cartridges .You can use these cartridges in a standard caulking gun. Also.. have your paste vendor supply you with some empty jars.(They will usually do this free of charge) Whenever you run a job, dispense paste
Electronics Forum | Wed Mar 25 16:38:21 EST 1998 | Steve Joy
We have successfully put .016" vias in .030" pads. There is no issue with .030" solder balls, since the actual volume of the .002" via in pad is small compared to the ball+solder paste volume. We did notice random bubbles where, apparently, the sol
