ASTM_D_1844_-_86_2020.pdf

Designation:D184486(Reapproved 2020)Standard Test Methods forChemical Analysis of Basic Lead Silicochromate1This standard is issued under the fixed designation D1844;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.1.Scope1.1 These test methods cover the chemical analysis of thepigment commercially known as basic lead silicochromate andare applicable to pigment supplied by the manufacturer and topigment,but not mixed pigments,separated from liquidcoatings.The presence of basic lead silicochromate speciesshall be confirmed by X-ray diffraction analysis(see Specifi-cation D1648).1.2 For liquid coatings the pigment must first be separatedfrom the vehicle before conducting the analysis.1.3 The analytical procedures appear in the following order:SectionsLead oxide6 to 14Chromium trioxide15 to 23Silica24 to 27Moisture and other volatile matter28Coarse particles29Oil absorption30Mass color and tinting strength311.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 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.1.6 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:2D185 Test Methods for Coarse Particles in PigmentsD280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD281 Test Method for Oil Absorption of Pigments bySpatula Rub-outD387 Test Method for Color and Strength of ChromaticPigments with a Mechanical MullerD1193 Specification for Reagent WaterD1648 Specification for Basic Lead Silicochromate PigmentD2371 Test Method for Pigment Content of Solvent-Reducible Paints3.Significance and Use3.1 These test methods may be used to confirm the statedlead oxide,chromium trioxide and silica content of basic leadsilicochromate and is useful for quality control.4.Purity of Reagents4.1 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.4.2 Unless otherwise indicated,references to water shall beunderstood to mean reagent water conforming to Type II ofSpecification D1193.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.31 on Pigment Specifications.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1961.Last previous edition approved in 2014 as D1844 86(2014).DOI:10.1520/D1844-86R20.2For 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.3ACS Reagent Chemicals,Specifications and Procedures for Reagents andStandard-Grade Reference Materials,American Chemical Society,Washington,DC.For suggestions on the testing of reagents not listed by the American ChemicalSociety,see Analar Standards for Laboratory Chemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeia and National Formulary,U.S.Pharma-copeial 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.15.Preparation of Sample5.1 Thoroughly mix liquid coatings and separate in accor-dance with Test Method D2371 sufficient pigment to enable therequired analyses to be carried out.5.2 Thoroughly mix pigment supplied as such and grindseparated pigment to a fine powder in a mortar and pestlebefore taking portions for analysis.TOTAL LEAD AS LEAD OXIDE-GRAVIMETRICMETHOD6.