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ASTM D8117-21
Standard Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by Differential Scanning Calorimetry
Přeložit název
NORMA vydána dne 1.7.2021
Informace o normě:
Označení normy: ASTM D8117-21
Datum vydání normy: 1.7.2021
Kód zboží: NS-1029335
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM D8117-21 :
Keywords:
differential scanning calorimetry, oxidative induction time, polyolefins,, ICS Number Code 59.080.70 (Geotextiles)
Doplňující informace
| Significance and Use |
|
5.1?The OIT is a qualitative assessment of the level (or degree) of stabilization of the material tested. This test has the potential to be used as a quality control measure to monitor the stabilization level in formulated resin as received from a supplier, prior to extrusion. Note 2:?The OIT measurement is an accelerated thermal-aging
test, and as such can be misleading. Caution should be exercised in
data interpretation since oxidation reaction kinetics are a
function of temperature and the inherent properties of the
additives contained in the sample. For example, OIT results are
often used to select optimum resin formulations. Volatile
antioxidants may generate poor OIT results even though they may
perform adequately at the intended use temperature of the finished
product.
Note 3:?There is no accepted sampling procedure, nor have any
definitive relationships been established for comparing OIT values
on field samples to those on unused products, hence the use of such
values for determining life expectancy is uncertain and
subjective.
|
| 1. Scope |
|
1.1?This test method covers a procedure for the determination of the oxidative induction time (OIT) of polyolefin geosynthetics using differential scanning calorimetry. 1.2?The focus of the test is on geomembranes, but geogrids, geonets, geotextiles, and other polyolefin-related geosynthetics are also suitable for such evaluation. 1.3?The values stated in SI units are to be regarded as the standard. Note 1:?This standard and ISO 11357-6 2013 address the same
subject matter, but differ in technical content.
1.4?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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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