ASTM_D_5672_-_D_5672M_-_15.pdf

Designation:D5672/D5672M15Standard 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 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 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 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-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 screen 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.Combiningvalues 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 and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1This test method and ISO 2439 address the same subjectmatter,but differ in technical content.2.Referenced Documents2.1 ASTM Standards:2D3574 Test Methods for Flexible Cellular MaterialsSlab,Bonded,and Molded Urethane FoamsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 2439Flexible 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 This test method is based on Test Methods D3574,TestB1.Refer to Test Methods D3574 for terminology used in thistest method.4.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 cushion thicknesses.4.3 This test method is designed to give a value approxi-mating the 25%IFD on a 100-mm 4-in.thick piece of foamwhen the actual specimen thickness tested is within the rangeslisted in the test method.In case of disagreement,the referee1This 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 June 1,2015.Published July 2015.Originally approvedin 1995.Last previous edition approved in 2009 as D5672-09.DOI:10.1520/D5672_D5672M-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 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 at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 method is the IFD procedure in Test Methods D3574,Test B1.The user of this test method shall establish the correlationbetween this test method and the referee method.5.Apparatus5.1 The apparatus used for determining IFD in Test MethodsD3574,Test B1is used for this test method.6.Conditioning6.1 The conditioning conditions described in Test MethodsD3574 are ideal when using this test method;however,sincethis method is a screening-type test method,precise condition-ing is not always practical.6.2 IFD is very sensitive to temperature and humidityconditions,therefore,testing samples that have been exposedto extreme conditions of humidity and temperature shall beav