ASTM D8117-17

Standard Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by Differential Scanning Calorimetry

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.
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 and health 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.

General Information

• Status: Historical
• Publication Date: 31-May-2017
• ICS: 59.080.70 - Geotextiles
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.02 - Endurance Properties

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D8117 −17
Standard Test Method for
Oxidative Induction Time of Polyolefin Geosynthetics by
1
Differential Scanning Calorimetry
This standard is issued under the fixed designation D8117; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E967 Test Method for Temperature Calibration of Differen-
tial Scanning Calorimeters and Differential Thermal Ana-
1.1 This test method covers a procedure for the determina-
lyzers
tion of the oxidative induction time (OIT) of polyolefin
geosynthetics using differential scanning calorimetry.
3. Terminology
1.2 The focus of the test is on geomembranes, but geogrids,
3.1 Definitions:
geonets, geotextiles, and other polyolefin-related geosynthetics
3.1.1 For definitions of terms applying to thermal analysis,
are also suitable for such evaluation.
refer to Terminology E473.
1.3 The values stated in SI units are to be regarded as the
3.1.2 For definitions of terms related to geosynthetics, refer
standard.
to Terminology D4439.
3.2 Definitions of Terms Specific to This Standard:
NOTE1—ThisstandardandISO11357-62013addressthesamesubject
3.2.1 oxidative induction time—a relative measure of a
matter, but differ in technical content.
material’s resistance to oxidative decomposition; it is deter-
1.4 This standard does not purport to address all of the
mined by the thermoanalytical measurement of the time
safety concerns, if any, associated with its use. It is the
interval to onset of exothermic oxidation of a material at a
responsibility of the user of this standard to establish appro-
specified temperature in an oxygen atmosphere.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 3.3 Abbreviations:
1.5 This international standard was developed in accor- 3.3.1 HDPE—high-density polyethylene.
dance with internationally recognized principles on standard-
3.3.2 LDPE—low-density polyethylene.
ization established in the Decision on Principles for the
3.3.3 LLDPE—linear low-density polyethylene.
Development of International Standards, Guides and Recom-
3.3.4 OIT—oxidative induction time.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Summary of Test Method
2. Referenced Documents 4.1 The sample to be tested is heated at a constant rate in an
2
inert gaseous environment (nitrogen). When the specified
2.1 ASTM Standards:
temperature has been reached, the atmosphere is changed to
D4439 Terminology for Geosynthetics
oxygen maintained at the same flow rate. The specimen is then
D4703 Practice for Compression Molding Thermoplastic
held at constant temperature until the oxidative reaction is
Materials into Test Specimens, Plaques, or Sheets
displayed on the thermal curve. The OIT is determined from
E473 Terminology Relating to Thermal Analysis and Rhe-
the data recorded during the isothermal period. The time
ology
interval from when the oxygen flow is first initiated to the
E691 Practice for Conducting an Interlaboratory Study to
oxidative reaction is referred to as the induction period.
Determine the Precision of a Test Method
4.1.1 The end of the induction period is signaled by an
abrupt increase in the specimen’s evolved heat or temperature
1 and will be recorded as an exothermic event by a differential
This test method is under the jurisdiction of ASTM Committee D35 on
Geosynthetics and is the direct responsibility of Subcommittee D35.02 on Endur- scanning calorimeter (DSC).
ance Properties.
4.2 The test is conducted in open aluminum pans.
Current edition approved June 1, 2017. Published June 2017. Originally
approved in 2017. DOI: 10.1520/D8117-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5. Significance and Use
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.1 The OIT is a qualitative assessment of the level (or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. degree) of stabilization of the material tested. This test has the
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D8117−17
potential to be used as a quality control measure to monitor the 7.2 Oxygen, ultra-high purity grade (extra dry).
stabilization level in formulated resin as received from a
7.3 Nitrogen, ultra-high purity grade (extra dry).
supplier, prior to extrusion.
7.4 Aluminum Pan Degreasing Solvent.
NOTE 2—The OIT measurement is an accelerated thermal-aging test,
7.5 Ind
...