ASTM D 4883 Standard Test Method for Density of Polyethylene by the Ultrasound Technique
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ASTM D 4883 Document Information:
Title
Standard Test Method for Density of Polyethylene by the Ultrasound Technique
ASTM International
Publication Date:
Jul 10, 2003
Scope:
This test method covers the determination of the density of
polyethylene through the utilization of
ultrasound equipment.
This test method is based on the distinct behaviors of the amorphous
and crystalline phases of
polyethylene in response to ultrasound. Polyethylene can be viewed as
a composite structure where
high-density crystalline regions are connected by lower-density
amorphous material. The ratio of
crystalline to amorphous material determines the final density of the
material. The amorphous and
crystalline phases exhibit very distinct behaviors with regard to the
propagation of sound waves.
The propagation characteristics in the composite will depend on the
relative amount of the two
phases (the degree of crystallinity).
Inorganic materials increase density as measured by Test Methods D 792
and D 1505, but they have
little or no effect on ultrasonic density. The ultrasonic measurement
is basically a base resin
density.
The values stated in SI units are to be regarded as the standard. The
values given in parentheses
are for information only.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
NOTE 1 - There is no similar or equivalent ISO standard.
Keywords:
- amorphous
- crystalline
- density
- molded
- plaques
- polyethylene
- sonic
- ultrasonic
- ultrasound
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