Electronics Forum | Mon Nov 07 16:31:47 EST 2005 | CW
hi Bob, Thanks for the info. I understand your comments, but I am looking for specific guidance, If I am putting chip capacitors on a .063 FR4 board, what size package should we stay away from to avoid cracking? (I realize this is dependent on h
Electronics Forum | Tue May 25 13:30:38 EDT 2010 | nikopolidis
HI Please Advice witch material can stand more heat FR4 or CEM3. PCB assembly will be used under the body of toaster Temp. range 90°C Could anyone tell me the difference in PCB material For imcoming quality control. Thanks & regards Fotis
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 | Thu Jul 22 02:58:25 EDT 1999 | George Verboven (Process Engineer)
| We are considering adding surface mount components to a board we currently produce. The board is made from CEM-1. Has anyone had any problems with surface mounting to this material? We use a glue/place/cure process. | | Thanks in advance, | |
Electronics Forum | Fri Oct 05 09:15:23 EDT 2001 | Ben Bierlein
It is a PCB material that has a woven glass / epoxy internal core and glass veil surface. It is in between the paper materials (FR1,FR2 and CEM1) and FR-4 as far as strength and cost. It is available in HiCTI material for high power applications.
Electronics Forum | Tue Jun 22 00:09:14 EDT 2010 | leadthree
You should do some testing what temp you really get. Solder will melt 260~300ºC. Back to the initial question, CEM-3 is a bit harder to buy and has not many varieties. Go for FR4, you can go for a higher Tg then the common 130ºC. There is also 140,
Electronics Forum | Wed Sep 13 20:58:50 EDT 2000 | Dave F
If you don't know what you have, how the blank are we sposed to tell you? Try your local fab. CEM1 - Opaque tan CEM3 - Translucent FR2 - Opaque brown FR3 - Opaque cream FR4 - Translucent FR5 - Translucent FR6 - Opaque white G10 - Translucent G11 -
