ASTM_D_4603_-_03_2011e1.pdf

Designation:D460303(Reapproved 2011)1Standard Test Method forDetermining Inherent Viscosity of Poly(EthyleneTerephthalate)(PET)by Glass Capillary Viscometer1This standard is issued under the fixed designation D4603;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()indicates an editorial change since the last revision or reapproval.1NOTEReapproved with editorial change to 6.5 in November 2011.1.Scope1.1 This test method is for the determination of the inherentviscosity of poly(ethylene terephthalate)(PET)soluble at0.50%concentrationina60/40phenol/1,1,2,2-tetrachloroethane solution by means of a glass capillary vis-cometer.Highly crystalline forms of PET that are not soluble inthis solvent mixture will require a different procedure.1.2 The inherent viscosity values obtained by this testmethod are comparable with those obtained using differentialviscometry described in Test Method D5225.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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.Specific hazardsstatements are given in Section 8.NOTE1This test method and ISO 1628-5 are similar but not techni-cally equivalent.This ISO standard gives an option of solvents for PET.Solvent specified in this ASTM test method is one of the options in theISO method.ISO also uses Type 1C Ubbelohde viscometer,rather than the1B,and reports viscosity number,rather than inherent viscosity.2.Referenced Documents2.1 ASTM Standards:2D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D446 Specifications and Operating Instructions for GlassCapillary Kinematic ViscometersD1972 Practice for Generic Marking of Plastic ProductsD5225 Test Method for Measuring Solution Viscosity ofPolymers with a Differential ViscometerE1 Specification for ASTM Liquid-in-Glass ThermometersIEEE/ASTM SI-10 Practice for Use of the InternationalSystem of Units(SI)E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 1628-5 Determination of the Viscosity of Polymers inDilute Solution Using Capillary ViscometersPart 5:Thermoplastic Polyester(TP)homopolymers and Copo-lymers.32.3 NIST Standard:C 602 Testing of Glass Volumetric Apparatus43.Terminology3.1 Units,symbols,and abbreviations used in this testmethod are those recommended in Practice IEEE/ASTMSI-10.3.2 Definitions of Terms Specific to This Standard:3.2.1 inherent viscosity(also known as the logarithmicviscosity number)defined by the equation given in 11.1.3.2.2 PETas outlined in Practice D1972.The PET acro-nym may be used to avoid trademark infringement and tocomply with various state or federal laws.4.Summary of Test Method4.1 The inherent viscosity is determined by measuring theflow time of a solution of known polymer concentration andthe flow time of the pure solvent in a capillary viscometer at afixed temperature.The inherent viscosity value is calculatedfrom the flow time values.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.70 on Analytical Methods(D20.70.05).Current edition approved Nov.15,2011.Published April 2012.Originallyapproved in 1986.Last previous edition approved in 2003 as D4603 03.DOI:10.1520/D4603-03R11E01.2For 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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.*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 5.Significance and Use5.1 The inherent viscosity is relatable to the compositionand molecular weight of a polyester resin.It must be controlledso that the processability and end properties of the resin remainin a desired range.6.Apparatus6.1 Cannon Ubbelohde Type 1B Viscometer,as described inSpecifications and Operating Instructions D446.6.2 Viscometer Holder.6.3 Electric Timer,readable to 0.1 s,as described in TestMethod D445.6.4 Constant Temperature Bath,control label at 30C(86F)6 0.01C(0.02F).6.5 Kinematic Viscosity Thermometer ASTM 118(for use at30C),confo