1、Designation:D572122Standard Practice forAir-Oven Aging of Polyolefin Geomembranes1This standard is issued under the fixed designation D5721;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parenth
2、eses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a means for estimating the resis-tance of polyolefin geomembranes to thermal aging in thepresence of air.1.2 This practice should be us
3、ed as a guide to comparethermal aging characteristics of materials as measured by thechange in some property of interest.This practice does notpredict thermal aging characteristics where interactions be-tween stress,environment,temperature,and time controlfailure.1.3 This practice is useful for the
4、development of formula-tions of polyolefin geomembranes.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsib
5、ility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization e
6、stablished in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD638 Test Me
7、thod for Tensile Properties of PlasticsD746 Test Method for Brittleness Temperature of Plasticsand Elastomers by ImpactD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD1238 Test Method for Melt Flow Rates of Thermoplasticsby Extrusion PlastometerD1505
8、Test Method for Density of Plastics by the Density-Gradient TechniqueD1525 Test Method for Vicat Softening Temperature ofPlasticsD1790 Test Method for Brittleness Temperature of PlasticSheeting by ImpactD3045 Practice for Heat Aging of Plastics Without LoadD4439 Terminology for GeosyntheticsD5885/D5
9、885M Test Method for Oxidative Induction Timeof Polyolefin Geosynthetics by High-Pressure DifferentialScanning CalorimetryD6693/D6693M Test Method for Determining Tensile Prop-erties of Nonreinforced Polyethylene and NonreinforcedFlexible Polypropylene GeomembranesD8117 Test Method for Oxidative Ind
10、uction Time of Poly-olefin Geosynthetics by Differential Scanning CalorimetryE145 Specification for Gravity-Convection and Forced-Ventilation OvensF412 Terminology Relating to Plastic Piping Systems3.Terminology3.1 Definitions:3.1.1 For definitions of general terms used in this standard,refer to Ter
11、minology D4439.3.1.2 aging,nthe process of exposing materials to anenvironment for an interval of time.3.1.3 polyolefin,na polymer prepared by the polymeriza-tion of an olefin(s)as the sole monomer(s).(F412)3.1.4 Vicat softening pointthe temperature at which aflat-ended needle of 1 mm2circular cross
12、 section will penetratea thermoplastic specimen to a depth of 1 mm under a specifiedload using a selected uniform rate of temperature rise.(D1525)4.Significance and Use4.1 Under the conditions of this test,the specimens undergodegradation at a rate that is a function of the thermal enduranceof the p
13、olyolefin geomembrane under examination.4.2 The rate of change of a particular property as a functionof temperature may be evaluated using the temperatures andtimes outlined in Practice D3045.1This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-thetics and is the direct responsib
14、ility of Subcommittee D35.02 on EnduranceProperties.Current edition approved Jan.1,2022.Published January 2022.Originallyapproved in 1995.Last previous edition approved in 2018 as D5721 08(2018).DOI:10.1520/D5721-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cu
15、stomer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed
16、in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?4.3 Any correlation between this practice and service life ofpolyolefin geomembranes must be determined for the particu-lar application in which they are to be used.4.4 Air-oven aging can be used to evaluate and compare theper
