Electronics Forum: tg' (Page 1 of 19)

PCBA was swollen after SMD

Electronics Forum | Thu Sep 09 19:32:12 EDT 2021 | kumarb

Forgot to ask earlier - what is the TG rating for your laminate? If not selected already, use a high TG rating like TG155 or TG170 laminates for the ROHS temps. Never saw swollen PCBAs with such rated PCBs to date.

Tg - Glass transition temperature

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

High TG?

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

High TG?

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

Minimum Tg for LeadFree board.

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

Tg and reflow

Electronics Forum | Fri Dec 16 18:37:10 EST 2005 | mdemos1

Hi. I am trying to understand Tg and how it relates to reflow. With the higher temperatures of lead free, we have been looking toward laminates with a Tg of 180 instead of the current 140. My question is a little more general. In either lead free

High Tg laminates

Electronics Forum | Tue Nov 16 18:02:29 EST 1999 | John Holland

What are the main advantages of moving from a 140 degree C FR4 laminate to a higher Tg laminate 180 degree C ?. Would the higher Tg laminate be less susceptable to bow and twist ?. John Holland

Lead Free Substrate

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

Tg and reflow

Electronics Forum | Mon Dec 19 12:21:09 EST 2005 | Amol Kane

from what i know, Tg is important from thermal stresses point of view. board warpage increases greately when Tg is exceed

High TG?

Electronics Forum | Mon Nov 13 13:15:51 EST 2006 | CK the Flip

Tg, by definition is the glass transition temperature for materials. It's the temperature where your board goes from rigid to "rubbery". Not sure if a higher Tg would help prevent delam. One of the PCB experts of the forum might know this.

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