Electronics Forum | Wed Mar 10 16:18:29 EST 1999 | greg cronin
I am looking for a supplier for bare fr4 material. I use the fr4 for fixtures and my supply has run out. A supplier in the new england area would be the best. thank you
Electronics Forum | Wed Mar 10 18:37:27 EST 1999 | Earl Moon
| I am looking for a supplier for bare fr4 material. I use the fr4 for fixtures and my supply has run out. A supplier in the new england area would be the best. | thank you | New England Laminate Co (NELCO) and Polyclad in NH. Earl Moon
Electronics Forum | Thu Mar 11 10:37:01 EST 1999 | Justin Medernach
| | I am looking for a supplier for bare fr4 material. I use the fr4 for fixtures and my supply has run out. A supplier in the new england area would be the best. | | thank you | | | New England Laminate Co (NELCO) and Polyclad in NH. | | Earl Moo
Electronics Forum | Mon May 10 16:51:32 EDT 1999 | Ruby Zheng
| Can anyone tell me what the recommended material for molding with thermal expension coeffecient around 20ppm and transparent for lightwave 850nm. Thanks |
Electronics Forum | Thu Feb 03 06:21:57 EST 2000 | Ignacio Simon
I would like to have information about the materials commonly used for laminates of printed circuit boards, their main thermal, mechanical, humidity and electrical characteristics and proper finishing and aplicattions, and advantages/disadvantages be
Electronics Forum | Mon May 23 08:22:31 EDT 2005 | davef
Thermal mass is the ability of a material to absorb heat energy. * A lot of heat energy is required to change the temperature of high density areas, like a ground plane. They are therefore said to have high thermal mass. * Light weight areas, such as
Electronics Forum | Fri Sep 26 07:26:33 EDT 2008 | realchunks
Looks like lack of wetting. What is the BGA ball material? Could be high temp. Could be improper profile. Could be paste sat on board too long / flux dryout. Could be co-plane mount and this ball touched at the end of reflow curve. Could be cont
Electronics Forum | Thu Apr 18 11:44:34 EDT 2002 | jsmith01
Does anyone know of a PCB material that is better at preventing arcing than fr4 or g10?
Electronics Forum | Thu Apr 18 16:55:39 EDT 2002 | davef
Yes. Ceramic is much better. We use FR4 in fairly high voltage circuits. What are the particulars? * Where are you arcing * How many layers, prepreg, etc
Electronics Forum | Sat Mar 01 08:17:40 EST 2003 | davef
You're correct that the FR4 is probably the best choise. The majority of the problems in developing your reflow recipe is going to come from the CTE mismatches in the CCBGA , CBGA and PBGA that you put on the board. The other side says given the pr
