Electronics Forum | Thu Aug 20 10:54:25 EDT 2009 | newpic
What is the minimum Tg for FR4 board to consider as Lead Free board? My issue is, I do not know what is the web for the V-Score for a FR4 Tg 180. I use to use a FR4 Tg 140 and there is no problem with it, but since we convert to Lead Free and the
Electronics Forum | Fri Aug 21 04:43:14 EDT 2009 | ghepo
Hello, I suggest you visit the website http://www.analysispcb.com, where I found these information : PARAMETERS FOR DOUBLE “V” SCORING LEAD FREE LAMINATES Typ WEB Thickness, 1.6mm : 0.38mm (+.15/-0) "...Tg is not a good indicator of a materials’
Electronics Forum | Fri Jun 04 01:13:31 EDT 2010 | boardhouse
Hi fotis, Big difference between Cem3 & FR4 is that FR4 the glass is woven and Cem3 is sheet glass non-woven. for Multi layer product, i would not consider Cem3 due to increase chance of de-lam due to lack of weave for strength. Cem1 and Cem3 are
Electronics Forum | Fri Jun 04 11:28:15 EDT 2010 | mikesewell
At 400C, I'd worry about the solder as well....
Electronics Forum | Wed Jun 23 07:24:55 EDT 2010 | szpcbpartner
welcome to PCB Partner, there are more than 2300 PCB suppliers here. http://www.pcbpartner.com
Electronics Forum | Wed Mar 02 18:25:54 EST 2022 | proceng1
Yeah, all of our FLEX board come with the rigid already installed.
Electronics Forum | Fri Feb 02 15:22:32 EST 2024 | carl_p
Machine a clamp into or from the FR4. to Tension the boards into place
Electronics Forum | Mon Feb 05 11:45:07 EST 2001 | peterbarton
Phil, One source for this information is form the manufacturer Park/Nelco. They have a large website and give specifications for all sorts of laminates, including FR4. Try http://www.nelcointernational.com/parknelco/fr4epoxy.htm. I'm sure that ot
Electronics Forum | Tue Mar 21 17:32:48 EST 2000 | Charles Barker
Greetings all you knowledgable SMT persons! 1. Typically, for multi-layer (6-8 layers), FR4, SMT boards stored in an air conditioned environment at about 50+/- 10% RH, how many months (or years) would you allow to pass before you would recommend bak
Electronics Forum | Tue Aug 22 13:04:04 EDT 2000 | Eugene Smelik
Dr. Lee, Given the higher reflow temperatures for Pb-Free assembly, will common FR4 laminate materials be adequate, or do you believe that higher glass content boards will be required for mainstream Pb-free assembly? As a corollary question - if man
