ASTM_D_5476_-_99.pdf

Designation:D 5476 99Standard Classification System forThermoplastic Polyurethane Materials(TPU)1This standard is issued under the fixed designation D 5476;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.INTRODUCTIONThis classification system and subsequent line callout is intended to be a means of calling outthermoplastic polyurethane materials used in the fabrication of end items or parts.It is not intendedfor the selection of materials.Material selection should be made by those having expertise in theplastics field after careful consideration of the design and performance required of the part,environment to which it will be exposed,fabrication processes to be used,and inherent properties ofthe material other than those covered by this classification.1.Scope1.1 This classification system covers thermoplastic polyure-thane materials suitable for injection molding,extrusion,com-pression molding,melt processing,or other applicable meth-ods.Recycled thermoplastic polyurethanes meeting theclassification requirements may be used interchangeably withvirgin resin.1.2 The properties included in this classification system arethose required to identify the compositions covered.There maybe other requirements necessary to identify particular charac-teristics important to specialized applications,which may bedesignated by using the suffixes as given in Section 5.1.3 The values stated in SI units are to be regarded as thestandard.1.4 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.NOTE1There are no ISO standards covering the primary subjectmatter of this ASTM classification.2.Referenced Documents2.1 ASTM Standards:D 256 Test Methods for Impact Resistance of Plastics andElectrical Insulating Materials2D 412 Test Methods for Rubber Properties in Tension3D 618 Practice for Conditioning Plastics and ElectricalInsulating Materials for Testing2D 638 Test Method for Tensile Properties of Plastics2D 648 Test Method for Deflection Temperature of PlasticsUnder Flexural Load2D 696 Test Method for Coefficient of Linear Thermal Ex-pansion of Plastics2D 790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-als2D 792 Test Method for Specific Gravity(Relative Density)and Density of Plastics by Displacement2D 883 Terminology Relating to Plastics2D 1600 Terminology for Abbreviated Terms Relating toPlastics2D 1897 Practice for Injection Molding Test Specimens ofThermoplastic Molding and Extrusion Materials4D 2240 Test Method for Rubber PropertyDurometerHardness4D 3892 Practice for Packaging/Packing of Plastics5D 4000 Classification System for Specifying Plastic Mate-rials5D 5033 Guide for the Development of Standards Relating tothe Proper Use of Recycled Plastics5E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications63.Terminology3.1 DefinitionsFor definitions of technical terms pertain-ing to plastics used in this classification,see TerminologiesD 883 and D 1600 and Guide D 5033.1This classification system is under the jurisdiction of ASTM Committee D-20on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermo-plastic Materials.Current edition approved March 10,1999.Published June 1999.Originallypublished as D 547693.Last previous edition D 547693.2Annual Book of ASTM Standards,Vol 08.01.3Annual Book of ASTM Standards,Vol 09.01.4Annual Book of ASTM Standards,Vol 08.02.5Annual Book of ASTM Standards,Vol 08.03.6Annual Book of ASTM Standards,Vol 14.02.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.4.Classification4.1 Unreinforced thermoplastic polyurethane materials areclassified into groups according to their chemical composition.These groups are subdivided into classes and grades as shownin the basic property table(Table TPU).TABLETPURequirements for Thermoplastic PolyurethanesGroupDescriptionClassDescriptionAGradeDescriptionTensileStress,100%Elongation,MPa,min,Test MethodsD 412Elongation,Ultimate,%,min,TestMethodsD 412SpecificGravity,60.04,TestMethod D 79201aromatic polyester1nominal hardness11.46001.1060 Shore A22.07001.100other2nominal hardness70 Shore A120other2.03.07005001.101.103nominal hardness13.03001.1580 Shore A24.03001.1735.03001.1746.03001.170other4nominal hardness14.03001.2290 Shore A26.03001.2238.03001.22410.03001.22512.03001.220other5nominal hardness18.04001.2250 Shore D210.04001.22312.04001.22414.03001.22516.03001.22618.03001.220other6nominal hardness112.02501.2260 Shore D