ASTM_D_718_-_86_2020.pdf

Designation:D71886(Reapproved 2020)Standard Test Methods forAnalysis of Aluminum Silicate Pigment1This standard is issued under the fixed designation D718;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 analysis of aluminumsilicate pigment.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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.1.4 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to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D234 Specification for Raw Linseed Oil(Withdrawn 2007)3D280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD717 Test Methods for Analysis of Magnesium SilicatePigmentD1193 Specification for Reagent WaterD1208 Test Methods for Common Properties of CertainPigmentsD2448 Test Method for Water-Soluble Salts in Pigments byMeasuring the Specific Resistance of the Leachate of thePigmentE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Significance and Use3.1 These test methods may be used to confirm the statedaluminum oxide and SiO2content of aluminum silicate forquality control.4.Apparatus4.1 Platinum Crucible.4.2 Electric furnace(or gas burner),capable of 1050 to1100C.4.3 Volumetric flask,100 and 250 mL.4.4 Colorimeter,with transmission range from 400 to 550nm.4.5 High Silica Crucible.5.Purity of Reagents5.1 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,4where suchspecifications are available.Other 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.5.2 Unless otherwise indicated,references to water shall beunderstood to mean Type II of Specification D1193.SILICON DIOXIDE6.Procedure6.1 Determine the silicon dioxide content in accordancewith Test Methods D717.1These 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 1943.Last previous edition approved in 2014 as D718 86(2014).DOI:10.1520/D0718-86R20.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4ACS 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.ALUMINUM OXIDE7.Reagents7.1 Ammonium Acetate(20%)Dissolve 200 g of ammo-nium acetate(NH4C2H3O2)in 1 L of distilled water.7.2 Ammonium Chloride Solution(20 g/L)Dissolve 20 gof ammonium chloride(NH4Cl)in water and dilute to 1 L.7.3 Ammonium Hydroxide(sp gr 0.90Concentrated am-monium hydroxide(NH4OH).7.4 Diphenylamine Indicator Solution(1 g/100 mL)Dissolve 1 g of diphenylamine in 100 mL of concentratedsulfuric acid(H2SO4,sp gr 1.84).7.5 Hydrochloric Acid(sp gr 1.19)Concentrated hydro-chloric acid(HCl).7.6 Hydrochloric Acid(1+3)Mix 1 volume of concen-trated HCl(sp gr 1.19)with 3 volumes of water.7.7 Hydrofluoric Acid(48%)Concentrated