DSC typically gives a result 4-5 degrees higher than TMA.
TMA also gives you the CTE, DSC does not.

Ian


-----Original Message-----
From: Kang Zhang [mailto:[log in to unmask]]
Sent: Wednesday, June 21, 2000 12:06 PM
To: [log in to unmask]
Subject: Re: [TN] Tg


Hi,

Tg is one material characterization. It should be the same though using
different ways of measurement. From my experience, the best way to get Tg is
to use Differential Scanning Calorimeter (DSC).

Kang


>From: LI YUAN <[log in to unmask]>
>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,        LI YUAN
><[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Tg
>Date: Tue, 20 Jun 2000 11:28:23 -0600
>
>Dear Technetters,
>
>There are normally TWO glass transition temperatures in material
>datasheets: Tg(TMA) and Tg(DMA).  In general, Tg(DMA) is higher than
>Tg(TMA) (like 30 - 50 C higher). Which one should a user use?
>
>Thanks,
>
>
>
>Yuan Li
>
>##############################################################
>TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>##############################################################
>To subscribe/unsubscribe, send a message to [log in to unmask] with following
>text in
>the body:
>To subscribe:   SUBSCRIBE TECHNET <your full name>
>To unsubscribe:   SIGNOFF TECHNET
>##############################################################
>Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
>additional
>information.
>If you need assistance - contact Keach Sasamori at [log in to unmask] or
>847-509-9700 ext.5315
>##############################################################

________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################