Density/Crystallinity
| Sample Type | Required Quantity | Equipment Used |
| Preforms Bottles |
5 |
Techne Density Gradient Column |
Purpose
This procedure determines a sample density and correlates that density
to crystallinity using theoretical PET amorphous and crystalline
densities according to ASTM D1505.
Description
Five samples are prepared by cutting approximately 1/4" samples from a
preform or bottle without touching the samples to prevent oils from
disturbing the testing. The entrapped air is removed from the surface of
the sample and the samples are then dropped into a density gradient
column and allowed to settle for approximately 15 minutes. The height of
the samples is then carefully measured. Standard density balls are used
to calibrate the density of the column. The sample density is then
correlated to the theoretical amorphous (1.3331) and crystalline
(1.45234) PET densities to determine the % crystallinity.
Video Demonstration
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