1、Designation:D212620Standard Test Method forResponse of Rigid Cellular Plastics to Thermal and HumidAging1This standard is issued under the fixed designation D2126;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revis
2、ion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers procedures for the ther
3、mal andhumid exposure of rigid cellular plastics.Conditions used shallbe agreed upon between the purchaser and the supplier.NOTE1A list of commonly used exposure conditions is found inTable 1.1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for inform
4、ation only.1.3 This standard does not purport 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior
5、to use.NOTE2This test method is equivalent to ISO 2796 in the samplingand calculation sections.It is not equivalent to ISO 2796 in the proceduresection.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decis
6、ion 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:2D883 Terminology Relating to PlasticsD1037 Test Methods for Evaluating Properties of W
7、ood-Base Fiber and Particle Panel MaterialsE456 Terminology Relating to Quality and Statistics2.2 ISO Standard:ISO 2796 Cellular Plastics Rigid-Test for Dimensional Sta-bility33.Terminology3.1 Terms used in this standard are defined in accordancewith Terminology D883,unless otherwise specified.For t
8、ermsrelating to precision and bias and associated issues,the termsused in this standard are defined in accordance with Terminol-ogy E456.4.Significance and Use4.1 Because of the wide variety of potential uses of rigidcellular plastics,artificial exposure to estimate the effectivebehavior of these ma
9、terials must be based,to a great extent,onthe intended application.Toward this end,this test method isintended to recommend a variety of conditions from which oneor more of the desired exposure conditions can be selected.(Note 3)4.2 The conditions recommended in this test method havebeen widely used
10、 in artificially exposing rigid cellular plasticsand in determining the effects of various temperatures andhumidities on these materials.Final test measurements aredetermined after the specimens return to room temperature.Where specified,the specimens will be tested at the exposurecondition,but must
11、 be reported as such.4.3 Dimensional changes measured by this test method canbe used to compare the performance of materials in a particularenvironment,to assess the relative stability of two or morecellular plastics,or to specify an acceptance criterion for aparticular material.The results of this
12、test method are notsuitable for predicting end-use product performance orcharacteristics,nor are they adequate for engineering or designcalculations.NOTE3Where thermal shock is known or suspected to occur due torapid heating to(or cooling from)a particular temperature,guidance onthe permissible heat
13、ing or cooling rates,or both,shall be obtained from1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.22 on Cellular Materials-Plastics and Elastomers.Current edition approved Dec.1,2020.Published December 2020.Originally
14、approved in 1962.Last previous edition approved in 2015 as D2126-15.DOI:10.1520/D2126-20.2For 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 standards Document Summary p
15、age onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2
16、959.United StatesThis international standard was developed 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.1the manufacturer of the material concerned.NOTE4The dimensional change of a specimen can vary dependingupon the age of the sample or the length of time between specimen
