1、Designation:D5885/D5885M15Standard Test Method forOxidative Induction Time of Polyolefin Geosynthetics byHigh-Pressure Differential Scanning Calorimetry1This standard is issued under the fixed designation D5885/D5885M;the number immediately following the designation indicates theyear of original ado
2、ption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a procedure for the determina-tion of the oxidative in
3、duction time(OIT)of polyolefingeosynthetics using high pressure differential scanning calo-rimetry.1.2 The focus of the test is on geomembranes,but geogrids,geonets,geotextiles,and other polyolefin-related geosyntheticsare also suitable for such evaluation.1.3 This test method measures the oxidative
4、 induction timeassociated with a given test specimen at a specified temperatureand pressure.1.4 This is an accelerated test for highly stabilized materials.It is applicable only to material whose OIT values under 3.4MPa of oxygen is greater than 30 min at 150C.1.5 The values stated in either SI unit
5、s or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.6 This standard does not pur
6、port to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in
7、Section 8.2.Referenced Documents2.1 ASTM Standards:2D3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryD4439 Terminology for GeosyntheticsD4491 Test Methods for Water Permeability of Geotextilesby PermittivityD4565 Test Methods for Physical and Environ
8、mental Per-formance Properties of Insulations and Jackets for Tele-communications Wire and CableD4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens,Plaques,or SheetsE473 Terminology Relating to Thermal Analysis and Rhe-ologyE967 Test Method for Temperature Calibration o
9、f Differen-tial Scanning Calorimeters and Differential Thermal Ana-lyzersE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG88 Guide for Designing Systems for Oxygen Service3.Terminology3.1 Definitions:3.1.1 differential scanning calorimetry(DSC),na tech
10、-nique in which the difference in heat flow inputs into asubstance and a reference material is measured as a function oftemperature or time,while the substance and reference materialare subjected to a controlled-temperature program.(See Ter-minology E473.)3.1.2 geomembrane,nan essentially impermeabl
11、e geosyn-thetic composed of one or more synthetic sheets.(See Termi-nology D4439.)3.1.2.1 DiscussionIn this test method,essentially imper-meable means that no measurable liquid flows through ageosynthetic when tested in accordance with Test MethodsD4491.3.1.3 geosynthetic,na planar product manufactu
12、red frompolymeric material used with soil,rock,earth,or other geo-technical engineering-related material as an integral part of aman-made project,structure,or system.(See TerminologyD4439.)3.1.4 high-pressure differential scanning calorimetry(HPDSC),ndifferential scanning calorimetry in which thesub
13、stance and reference material are exposed to a controlledsuperambient atmosphere.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.02 on Endur-ance Properties.Current edition approved May 1,2015.Published June 2015.
14、Originallyapproved in 1995.Last previous edition approved in 2012 as D5885 06(2012).DOI:10.1520/D5885_D5885M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the stand
15、ards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5 index test,na test procedure that may be used toestablish an order for a set of specimens with respect to theproperty of interest.3.1.6 ox
16、idative induction time(OIT),nthe elapsed timebetween first exposure to an oxidizing gas and the onset tooxidation of a material under isothermal conditions.3.1.6.1 DiscussionOxidative induction time is an indextest parameter dependent upon a wide range of experimentalconditions including temperature,pressure of oxygen,purgegas flow rate,and the presence or absence of catalysts.4.Summary of Test Method4.1 The specimen to be tested and the corresponding refer-ence material are heated from room tem