1、Designation:D5672/D5672M22Standard Test Method forTesting Flexible Cellular Materials Measurement ofIndentation Force Deflection Using a 25-mm 1-in.Deflection Technique1This standard is issued under the fixed designation D5672/D5672M;the number immediately following the designation indicates theyear
2、 of original adoption 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.Scope*1.1 This test method covers a screening type quality controltest
3、used to determine if flexible polyurethane foam cushionsare within the specified grade range for firmness.1.2 This test method is limited to foams with thicknessesthat are 75 mm 3 in.or greater.1.3 This test method is based on the fact that the traditionalindustry standard thickness for Indentation
4、Force Deflection(IFD)is 100 mm 4 in.,and the traditional percent deflectionfor IFD acceptance and product planning is 25%.With respect,then,to these traditional industry conventions,a 25%deflec-tion on a 100-mm 4-in.cushion would be 25 mm 1 in.Thus,deflecting standard cushions(of proper 100 mm thick
5、-ness)25 mm 1 in.provides a quick way to determine if theflexible polyurethane foam is within the specified grade rangefor 25%IFD.1.4 Cushion thicknesses less than 75 mm 3 in.shall not betested for IFD using this test method.1.5 This test method is intended to provide a quick andsimple method to scr
6、een flexible polyurethane foams fordetermination of its firmness grade.1.6 UnitsThe values stated in U.S.Customary or SI 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.Combining
7、values from the two systems may result in non-conformancewith the standard.1.7 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 a
8、nd deter-mine the applicability of regulatory limitations prior to use.NOTE1This test method and ISO 2439 address the same subjectmatter,but differ in technical content.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establi
9、shed 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:2D883 Terminology Relating to PlasticsE456 Terminology Relating to Qua
10、lity and StatisticsD3574 Test Methods for Flexible Cellular MaterialsSlab,Bonded,and Molded Urethane FoamsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2935 Practice for Evaluating Equivalence of Two TestingProcesses2.2 ISO Standard:ISO 2439Flexible
11、 Cellular Polymeric MaterialsDetermination of Hardness(Indentation Technique)2.3 Method for IFD,Chapter 4.0,“Flexible Polyurethane Foam Standards and Guidelines,”Joint Industry Foam Standards and Guidelines Commit-tee33.Terminology3.1 Terms used in this standard are defined in accordancewith Termino
12、logy D883,unless otherwise specified.For termsrelating to precision and bias and associated issues,the termsused in this standard are defined in accordance with Terminol-ogy E456.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommi
13、ttee D20.22 on Cellular Materials-Plastics and Elastomers.Current edition approved July 1,2022.Published July 2022.Originally approvedin 1995.Last previous edition approved in 2015 as D5672-15.DOI:10.1520/D5672_D5672M-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact AS
14、TM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from the Polyurethane Foam Association(PFA),334 Lakeside PlazaLoudon,TN 37774,http:/www.pfa.org.*A Summary of Changes section appears
15、at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for t
16、heDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.Significance and Use4.1 The 25-mm 1-in.deflection IFD method is recom-mended for production screening and quality control on fullsize cushions only.4.2 Applicable cushion thicknesses to be tested by this testmethod are only those listed in this test method.Furtherresearch and development are required before this test methodis applicable to other