ASTM_D_50_-_90_2011.pdf

Designation:D5090(Reapproved 2011)Standard Test Methods forChemical Analysis of Yellow,Orange,Red,and BrownPigments Containing Iron and Manganese1This standard is issued under the fixed designation D50;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 These test methods cover procedures for the chemicalanalysis of yellow,orange,red,and brown pigments containingiron and manganese.The test methods apply specifically to thefollowing pigments:synthetic hydrated yellow iron oxide,yellow ocher,red and brown iron oxides,raw and burnt umber,raw and burnt sienna,and venetian red.1.2 The analytical procedures appear in the following order:ASTMMethodRefer-Dry PigmentsSectionsencesMoisture and Other Volatile Matter6D280Loss on Ignition7Coarse Particles8D185Matter Soluble in Water9D1208Organic Coloring Matter10Iron Oxide11 and 12Calcium Compounds(Reported as CaO)13 and 14Sulfates Soluble in Hydrochloric Acid15 and 16Lead Chromate(in Ochers)17Calcium Carbonate(in Venetian Red)18C25Manganese(in Siennas and Umbers)19 and 20Pigment Pastes in OilPigment Content21D1208Moisture and Other Volatile Matter22D1208Nonvolatile Matter in Vehicle23Moisture by Distillation24D1208Coarse Particles and Skins25D185Consistency(Stormer)26D5621.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 us.2.Referenced Documents2.1 ASTM Standards:2C25 Test Methods for Chemical Analysis of Limestone,Quicklime,and Hydrated LimeD185 Test Methods for Coarse Particles in PigmentsD280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD562 Test Method for Consistency of Paints MeasuringKrebs Unit(KU)Viscosity Using a Stormer-Type Viscom-eterD1193 Specification for Reagent WaterD1208 Test Methods for Common Properties of CertainPigmentsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Significance and Use3.1 These test methods compile in one place,recommendedprocedures for analyzing inorganic colored pigments.Thesepigments are used extensively in paints,and for this reasontheir compositions are important to the formulators and user.4.Preparation of Sample4.1 Mix the sample thoroughly and take a representativeportion for analysis.Reduce any lumps or coarse particles to afine powder by grinding.Grind extracted pigments to pass aNo.80(180-m)sieve(see Specification E11 for detailedrequirements).Discard any skins that do not pass through thesieve.Mix the finely ground pigment thoroughly.5.Purity of Reagents5.1 Purity of ReagentsUnless otherwise indicated,it isintended that all reagents shall conform to the specifications of1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.31 on Pigment Specifications.Current edition approved June 1,2011.Published June 2011.Originallyapproved in 1917.Last previous edition approved in 2005 as D50 90(2005).DOI:10.1520/D0050-90R11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the Committee onAnalytical Reagents of theAmerican Chemi-cal Society,where such specifications are available.3Othergrades may be used,provided it is first ascertained that thereagent is of sufficiently high purity to permit its use withoutlessening the accuracy of the determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean Type II reagent waterconforming to Specification D1193.DRY PIGMENTSMoisture and Other Volatile Matter6.Procedure6.1 Determine moisture and other volatile matter in accor-dance with Method A of Test Methods D280.Loss on Ignition7.Procedure7.1 Weigh accurately approximately 1 g of pigment into apreviously weighed and ignited porcelain crucible(Note 1).Cover and ignite to constant weight over a bunsen or Mekerburner or in an electric furnace at a temperature of approxi-mately 900C.Cool in a desiccator,weigh,and calculate thepercent loss on ignition.This figure may include combinedwater,carbon dioxide(CO2),organic matter,and some sulfuricoxide(SO3)