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ASTM D 2238 Document Information:
Title
Standard Test Methods for Absorbance of Polyethylene Due to Methyl Groups at 1378 cm-1
ASTM International
Publication Date:
Dec 15, 1992
Scope:
These test methods cover measurement by infrared absorption
spectrophotometry of the
1378.4-cm−1 (7.255-µm) band in polyethylene due to
methyl groups. (1, 2,
4-7)(Footnote 2) Two test methods are covered:
Test Method A uses compensation with a standard sample film or wedge
of known methyl content.
Test Method B uses compensation with a wedge of polymethylene or a
polyethylene of known low methyl
content.
These test methods are applicable to polyethylenes of Types I (density
910 to 925 kg/m³), II
(density 926 to 940), and III (density 941 to 965).
NOTE 1 - For determination of density, see Specifications D 1248.
NOTE 2 - In cases of Type III polyethylene with densities greater than
0.950 g/cm³, different
results are obtained with the two test methods.
The values stated in SI units are to be regarded as the standard. The
values given in brackets 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. Specific
hazards statements are given in Section 7.
NOTE 3 - There is no similar or equivalent ISO standard covering the
subject matter of these test
methods.
Footnote 2 - The boldface numbers in parentheses refer to the list of
references at the end of
these test methods.
Keywords:
- Fourier transform spectroscopy
- infrared spectroscopy
- methyl groups
- polyethylene
- quantitative analysis
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