One is measuring heat absorption and the
other mechanical movement?

gary mccauley

-----Original Message-----
From: Gerard O'Brien [mailto:[log in to unmask]]
Sent: Thursday, September 20, 2001 10:23 AM
To: [log in to unmask]
Subject: [TN] Tg measurements by DMA


When testing Tg with DSC, the TM-650 test method calls out for the test to
be run with the copper clad still attached and that if removed to expect an
8 to 15 degree reduction in values. For DMA it does not reference testing
with copper clad or removed. Can anyone give me the reason why?

Regards

Gerard O'Brien

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