TA Instruments TMA 2940, Operator'S Manual

Page: 121 / 176

TA I
NSTRUMENTS
TMA 2940 4–31
Sample
Preparation
The parallel plate rheometer employs cylindrical
samples that are 9.53 mm (0.375 inch) in
diameter and 0.25 to 1.00 mm (0.01 to 0.04
inch) in thickness. Three types of samples can
be used with the rheometer accessory:
• Moldable powders
• Resinous materials
• Sheet materials.
In order to obtain a sample having the correct
cylindrical dimensions, the material must be
prepared according to the directions in this
section. Moldable powders and resinous
materials employ the use of the Sample Encap-
sulating Press (PN 900680.902) and a special set
of dies, the pellet press die set.
To prepare samples follow the instructions
found in these sections:
• Sample Encapsulating Press
__
see below
• Preparing Moldable Powders __ page 4-35
• Preparing Resinous Materials __ page 4-38
• Preparing Sheet Materials
__
page 4-40.
Sample
Encapsulating
Press
This accessory (see Figure 4.11) is used to form
samples into a compact, cylindrical disc. In
order to use it for parallel plate rheometer
samples, you must first remove the Encapsulat-
ing Press hermetic sealing or non-hermetic
crimping die assembly. After these dies have
been removed, the pellet press die set can be
installed.
Parallel Plate Rheometer Accessory