1、Designation:D71786(Reapproved 2020)Standard Test Methods forAnalysis of Magnesium Silicate Pigment1This standard is issued under the fixed designation D717;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A n
2、umber 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 magnesiumsilicate pigment.1.2 The values stated in SI units are to be regarded as thestandard.The v
3、alues 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 applic
4、ability 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
5、 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to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D234 Specification for Raw Linseed Oil(Withdrawn 2007)3D280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD718 Test Methods for Analysis
6、of Aluminum 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 thePigmentE97 Method of Test for Directional Reflectance Factor,45-D
7、eg 0-Deg,of Opaque Specimens by Broad-BandFilter Reflectometry(Withdrawn 1991)33.Significance and Use3.1 These test methods may be used to confirm the statedSiO2,CaO,and MgO content of magnesium silicate for qualitycontrol.4.Apparatus4.1 Platinum Crucible.4.2 Electric Furnace,capable of 1200C.5.Puri
8、ty 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,where suchspecifications are available.4Other grades may be used
9、,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.Reagents6.1 Hydrochlori
10、c Acid(sp gr 1.19)Concentrated hydro-chloric acid(HCl).6.2 Hydrochloric Acid(1+20)Mix 1 volume of concen-trated hydrochloric acid(HCl,sp gr 1.19)with 20 volumes ofwater.6.3 Hydrofluoric Acid(48%)Concentrated hydrofluoricacid(HF).6.4 Sodium Carbonate(Na2CO3).1These test methods are under the jurisdic
11、tion 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 D717 86(2
12、014).DOI:10.1520/D0717-86R20.2For 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 hi
13、storical 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 fo
14、r 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 wa
15、s 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.6.5 Sulfuric Aci
16、d(sp gr 1.84)Concentrated sulfuric acid(H2SO4).7.Procedure7.1 Transfer 1 g of the sample weighed to 0.1 mg to aplatinum crucible and fuse with 5 g of Na2CO3until the entirecontents of the crucible are in a molten state.Continue heatingfor 20 min.Keep a close-fitting platinum cover on the crucibleduring the fusion.When the fusion is complete,allow thecrucible and contents to cool,and transfer to a 600-mLporcelain casserole containing 200 mL of water(Note 1).Boiluntil the melt is disintegrated.NOT
