Electronics Forum | Wed Oct 29 06:17:45 EDT 2014 | julianf
As stated in the title I would like to know the thermo-elastic material properties, most preferably the E-modulus and CTE in x- and y-direction, for Epoxy/E-glass laminates and/or prepregs for various fibreglass cloth styles. Datasheets only give ro
Electronics Forum | Thu May 06 18:31:29 EDT 2004 | Dreamsniper
"Polymide Films absorb a great deal of moisture. Polymide laminates must be baked at more than 1 hour at 100'C or better for a double sided PWB prior to exposing the laminate to elevated temperatures such as that required for soldering. Moisture abso
Electronics Forum | Tue Feb 16 13:30:20 EST 2010 | asksmt
Hi, I have specified Lead Free Plating for my Four Layer PCB. but the Final Production Solder Process is not Lead free it is leaded Process. My question is will there be an issue if we use Lead free plating on PCB and use leaded solder material fo
Electronics Forum | Thu Jul 09 21:04:50 EDT 1998 | Dave F
| Hi there, | I am looking for some informations concerning the shear or pull strength of a typical TQFP 20 mils leads in relationship with the Copper/Tin intermetalic layer thickness. Could anyone help? | | Thank in advandce. | rgs, | chiakl Chiakl
Electronics Forum | Wed Aug 14 16:34:46 EDT 2002 | ksfacinelli
I have a PCB laminate that is 1 1/2 years old and showing signs of poor solderability. The NC flux I am using will not breakdown the oxides. During hand soldering the pads do not take solder. I am trying alternative fluxes and have seen an improve
Electronics Forum | Thu Feb 28 21:01:09 EST 2008 | davef
Tony: Thanks posting information about your experience with strippers. First, why did you need to strip the entire board? Next, please clarify the following points to expand our knowledge of using Humiseal 1063 Stripper: * How long was the conforma
Electronics Forum | Thu Jun 25 15:33:51 EDT 1998 | Earl Moon
| | Hi there, | | Does any one know what is TCE for fully wet saturated FR4. I came to know that for Dry FR4 the TCE is about 15-19 PPM �C. Is that true? | | | | Appreciated for your help. | | rgs, | | chiakl | Chiakl, | It looks like you are speaki
Electronics Forum | Tue Aug 23 16:57:29 EDT 2005 | HOSS
50% of seeing it in a single pass. The only time we do this is if we have a board off the line that has delaminated. We'll run a sample of boards through bare to confirm that we have a bad batch. Even if we see no failures on the bare boards, we'l
Electronics Forum | Fri Jul 11 11:14:30 EDT 2008 | bkreiman
I agree that it should be a non-issue considering that the primary purpose of a solder joint is to electrically connect the lead to the board. However, there are some here that think these leads should be touched up because this part is a power jack
Electronics Forum | Mon Dec 27 22:45:58 EST 1999 | Jim
Is there a way to avoid the reliability problems arising from the tce mismatch between ceramic chip smc's and FR4 laminates, without spending an arm and a leg on expensive substrate materials? Are there inexpensive substrates with reasonably compata
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