ASTM_D_5308_-_92.pdf

Designation:D 5308 92Standard Test Methods forSemi-Flexible Cellular Urethanes for Automotive and SimilarEnergy Absorption Applications1This standard is issued under the fixed designation D 5308;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 parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods apply to slab,bonded,and moldedsemi-flexible cellular products.Applications include arm rest,instrument panel,A-post,etc.1.2 Urethane foam may be generally defined as an expandedcellular product produced by the interaction of active hydrogencompounds,water,and isocyanates.1.3 Unless specifically stated otherwise between the sup-plier and the purchaser,all tests shall be made in accordancewith the test methods specified in the following sections:Test MethodSectionsADensity Test814BIndentation Force Deflection TestSpecifiedDeflection1521CCompression Force Deflection Test2228DConstant Deflection Compression Set Test2936ETension Test3744FTear Resistance Test4552GAdhesion Test5358HResilience(Ball Rebound)Test5966IVolume Change6772JSteam Autoclaving7378KDry Heat Aging7984LStaining8588MSolvent Resistance8994NFogging9598OCold Impact99103PResistance to Aging104108QHumid Aging109112RAccelerated Dry Aging113116SIndentation Recovery117124TFlammability125AppendixesX1Definitions of Terms Used to Describe the Force-Deflection Curveof Flexible Urethane FoamX2Suggested Tests for Determining Combustibility of Flexible Ure-thane Foam(The combustion tests are given for informationalpurposes only and are not part of the standard.)1.4 The values stated in SI units are to be regarded as thestandard.Values given in parentheses are for information only.1.5 This standard does not purport to address all of thesafety problems,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.2.Referenced Documents2.1 ASTM Standards:D 412 Test Methods for Vulcanized Rubber and Thermo-plastic Rubbers and Thermoplastic Elastomers Tension2D 3574 TestMethodforTestingFlexibleCellularMaterialsSlab,Bonded,and Molded Urethane Foams3D 4205 Guide for Flammability and Combustion Testing ofRubber and Rubber-Like Materials3D 4483 Practice for Determining Precision for Test MethodStandards in the Rubber and Carbon Black Industries23.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 bonded foama product produced by the adhesion ofsmall pieces of urethane foam to each other with a suitablebonding agent.3.1.2 corethe internal portion of a molded part,free ofskin.3.1.3 flexible cellular producta cellular organic polymericmaterial that will not rupture when a specimen 200 by 25 by 25mm is bent around a 25 mm diameter mandrel at a uniform rateof 1 lap in 5 s at a temperature between 18 and 29C.3.1.4 molded foama cellular product having the shape ofthe enclosed chamber in which it is produced by foaming.3.1.5 semi-flexible foamfoams that usually have higherload bearing,lower elongation,and lower resilience thanflexible foams used for seating or bedding at the same density.3.1.5.1 DiscussionSemi-flexible foam may or may notmeet the requirements of 3.1.3.3.1.6 skinthe smooth surface layer of a molded foamproduct,formed by contact with the mold or surfaces.3.1.7 slaba section of foam that is cut from the internalportion of a large bun.3.1.8 urethane foama flexible cellular product producedby the interaction of active hydrogen compounds,water,andisocyanates.4.Significance and Use4.1 The test procedures provide a standard method ofobtaining data for research and development,quality control,1This test method is under the jurisdiction ofASTM Committee D-20 on Plasticsand is the direct responsibility of Subcommittee D20.22 on Cellular Plastics.Current edition approved Nov.15,1992.Published March 1993.2Annual Book of ASTM Standards,Vol 09.01.3Annual Book of ASTM Standards,Vol 09.02.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMNOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.acceptance and rejection under specifications,and specialpurposes.4.2 The data obtained by these test methods is applicable tothe material under conditions of the particular test and is notnecessarily the same as that obtained in other environments inuse.5.General Test Conditions5.1 Tests shall be conducted under known conditions oftemperature and humidity or as specified in the individual testprocedure.The product shall be conditioned undeflected,andundistorted at the temperature and humidity of test for at least