ASTM_D_871_-_96_2019.pdf

Designation:D87196(Reapproved 2019)Standard Test Methods of TestingCellulose Acetate1This standard is issued under the fixed designation D871;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover procedures for testing cellu-lose acetate.1.2 The test procedures appear in the following sections:SectionsAsh8 to 11Color and Haze67 to 72Combined Acetyl or Acetic Acid ContentTest Method A.Solution Method17,19 to 23Test Method B.Heterogeneous Saponification Method17,24 to 26Free Acidity12 to 16Heat Stability47 to 56Hydroxyl Content27 to 33Intrinsic Viscosity57 to 62Moisture Content4 to 7Primary Hydroxyl Content34 to 39Sulfur or Sulfate Content40 to 45Viscosity63 to 661.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization 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:2D1193 Specification for Reagent WaterD1343 Test Method for Viscosity of Cellulose Derivativesby Ball-Drop MethodD2929 Test Method for Sulfur Content of Cellulosic Mate-rials by X-Ray FluorescenceD5897 Test Method for Determination of Percent Hydroxylon Cellulose Esters by Potentiometric TitrationAlternative Method3.Purity of Reagents3.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,where suchspecifications are available.3Other grades may be used,pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.3.2 Unless otherwise indicated,references to water shall beunderstood to mean reagent tared,low,wide-form weighingbottle and water,conforming to Specification D1193.MOISTURE CONTENT4.Significance and Use4.1 Moisture content of the cellulose ester can be used toestimate the dry weight of the cellulose ester.Since celluloseesters are desiccants,their moisture content can vary greatlydepending on storage.5.Procedure5.1 Transfer about 5 g of the sample to a tared,low,wide-form weighing bottle and weigh to the nearest 0.001 g.Dry in an oven for 2 h at 105 6 3C.Remove the bottle fromthe oven,cover,cool in a desiccator,and weigh.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.36 on Cellulose and Cellulose Derivatives.Current edition approved Jan.1,2019.Published January 2019.Originallyapproved in 1946.Last previous edition approved in 2010 as D871 96(2010).DOI:10.1520/D0871-96R19.2For 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.3Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally 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 6.Calculation6.1 Calculate the percentage of moisture as follows:Moisture,%5A/B!3100where:A=weight loss on heating,g,andB=sample used,g.7.Precision and Bias7.1 No statement on bias can be made as no referencematerial is available as a standard.ASH8.Significance and Use8.1 Ash content gives an estimate of the inorganic contentof cellulose ester samples.The presence of high