Electronics Forum | Thu Jan 03 07:49:20 EST 2002 | hany_khoga
Thanks Scott: The Assembley is Mixid ( reflow then wavesoldered). It is One curcuit. Is the Tg averagely known for FR4 PCB assemblies? Hany
Electronics Forum | Thu Jan 03 08:44:08 EST 2002 | davef
The Tg of the resin commonly used in FR-4 is 140�C. Consider checking with your supplier to better understand the specific materials used in constructing your board.
Electronics Forum | Mon Jul 01 17:22:27 EDT 2002 | Daan Terstegge
Tg = glass transition temperature, the temperature at which the glass-epoxy starts losing it's properties as a solid material. daan
Electronics Forum | Tue Feb 01 10:39:01 EST 2005 | Frank R.
Thanks Jay, Concerning your FR4 material, do you keep the same TG than what you use with Sn/Pb? Response from everybody would be also appreciate. Thanks and regards, Frank R.
Electronics Forum | Wed Aug 03 14:17:28 EDT 2005 | GS
What about PCB construction?: - CEM (2-3....)? FR4 ?....? - how many layers - what about TG ? GS
Electronics Forum | Mon Dec 19 07:49:33 EST 2005 | davef
=330*C is good advice. Search the fine SMTnet Archives for earlier discussions on Td, like http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=32430
Electronics Forum | Thu Jan 19 21:43:33 EST 2006 | davef
Specifically, what element of the bare board is blistering? Tg of 140 could be acceptable. Search the fine SMTnet Archives for background on decomposition temperature [td]
Electronics Forum | Fri Oct 27 11:17:41 EDT 2006 | MFG CAVEMAN
Since I didn't see it mentioned - Are you specifying a laminate that is considered compatible with a RoHS process? I don't mean just a high Tg but a high Td (decomposition) and CTE material such as Isola 410, FR408 etc.
Electronics Forum | Mon May 21 10:21:39 EDT 2007 | aj
Hi all, Can anyone share the revised spec that they now recommend for PB-FREE Processing ? I have been told to request High TG rating ? should this suffice. any replies appreciated. aj...
Electronics Forum | Thu Oct 11 21:31:59 EDT 2007 | petep
As a CM, how can you change the customer's base PC Board material to RoHS Compliant T-g spec's etc? Curious ...
