Electronics Forum | Mon Mar 07 15:35:35 EST 2005 | John M
It has been my experience that the standard Fr4 material (Tg 135c) will discolor when processed at the new higher temperatures required for the high tin alloys... We have been using the High Tg Fr4 (Tg 170c) for many years to ensure this does not hap
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 | Wed Nov 28 22:33:24 EST 2007 | davef
There is no specification for lead-free HASL. You can use any lead-free solderability protection that meets your customer requirements. Use IPC-9701 �Performance Test Methods and Qualification Requirements for Surface Mount Solder Attachments� to ass
Electronics Forum | Thu Jan 20 16:06:38 EST 2000 | Mike Naddra
Regarding glass transition , does anyone have expierance glass wiht transition temperature specification , such as what are the detrimental effects of exceeding the Tg , how long over the glass transition temperature ,if any , is acceptable. Tg of di
Electronics Forum | Mon Jan 29 13:11:31 EST 2024 | erikfriesen
I'd like to build my own carriers using tg fr4 as we have in house Cnc. Where can I find flush corner clamps? Or are these typically custom manufactured by individual carrier board manufacturers?
Electronics Forum | Wed Nov 15 09:36:27 EST 2006 | Board House
Hi AJ, The biggest mistake in the industry today is documentation for lead free assembly required product. We are still seeing prints coming in saying Lead Free / High TG FR4. When in reality standard FR4 170 Tg. material is considered High Tg. and L
Electronics Forum | Mon Nov 13 09:22:10 EST 2006 | aj
Hi all, Should we need to order the Higher TG to run boards safely thru a RoHS Process (reflow only)? We had an issue with the previous batch delaminating and were advised by supplier that we should have stated the higher TG rating even though the p
Electronics Forum | Mon Feb 06 10:12:30 EST 2006 | Yash Sutariya
Hi, I authored the presentation so I may be able to help you out with your Q's. 1. IPC is in draft stage for 4 new material specs. These are in the presentation. I would focus on IPC 4101/ 121 and /124. Match your current Tg requirement to the T
Electronics Forum | Mon Dec 18 22:28:03 EST 2000 | Charles Harper
I believe this is the case for the new,high performance LCPs(liquid crystal polymers),which are unique in their stiff,relatively thermally immobile structures.For other materials with higher Tg values than FR4,the basic relationship holds,but expansi
winsouce.jpg)
