1、Designation:D374814(Reapproved 2019)Standard Practice forEvaluating High-Density Rigid Cellular Plastics1This standard is issued under the fixed designation D3748;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.1.Scope*1.1 This practice covers the basic test procedures for deter-mination of the physical properties and reporting of data forhigh-density r
3、igid cellular plastics.1.2 The values stated in SI units are to be regarded asstandard.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
4、 practices and deter-mine the applicability of regulatory limitations prior to use.NOTE1This standard and ISO 9054 address the same subject matter,but differ in technical content.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-izati
5、on established 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:2C177 Test Method for Steady-State Heat Flux Measure-ments a
6、nd Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat C
7、ommercial Power FrequenciesD570 Test Method for Water Absorption of PlasticsD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD648 Test Method for Deflection Temperature of PlasticsUnder Flexural Load in the Edgewise PositionD695 Test Method for Co
8、mpressive Properties of RigidPlasticsD696 Test Method for Coefficient of Linear Thermal Expan-sion of Plastics Between 30C and 30C with a VitreousSilica DilatometerD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD883 Terminology Re
9、lating to PlasticsD1622/D1622M Test Method for Apparent Density of RigidCellular Plastics3.Terminology3.1 Definitions:3.1.1 high densitygreater than 320 kg/m3(0.32 g/cm3)or20 lb/ft3apparent density.3.1.2 For definitions of other terms used in this practice,refer to Terminology D883.4.Significance an
10、d Use4.1 This practice provides appropriate testing methods,anda specific data reporting procedure for high-density rigidcellular plastics.5.Sample Preparation5.1 Prepare samples in one of two ways:(a)process samples directly into proper size specimens,or(b)prepare samples from larger sections as sp
11、ecified ineach individual test.5.2 Report the precise manner of sample preparation.6.Conditioning6.1 Condition specimens prior to testing in accordance withProcedure A of Practice D618.7.Number of Test Specimens7.1 Cellular plastics are often nonuniform in density distri-bution;therefore,a minimum o
12、f five specimens needs to betested per testing method to obtain representative values.1This practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.22 on Cellular Materials-Plasticsand Elastomers.Current edition approved April 1,2019.Pu
13、blished May 2019.Originallyapproved in 1978.Last previous edition approved in 2014 as D3748 14.DOI:10.1520/D3748-14R19.2For referenced ASTM standards,visit the ASTM Web Site,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to t
14、he standards Document Summary page onthe ASTM web site.*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 StatesThis international standard was developed in accordance with internation
15、ally 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 8.Test Methods8.1 Where technically suitable,reference i
16、s made to existingASTM test methods.Otherwise,comments or changes areoutlined in accordance with this practice.8.2 Apparent DensityTest Method D1622/D1622M.8.3 Compressive StrengthTest Method D695.8.4 Tensile PropertiesTest Method D638.8.5 Coeffcient of Linear Thermal ExpansionTest MethodD696.8.6 Apparent Flexural PropertiesTest Methods D790.8.7 Deflection TemperatureTest Method D648.8.8 Dielectric Breakdown Voltage and Dielectric StrengthTest Methods D149.8.9 Thermal ConductivityTest Methods C1
