1、Designation:D234990(Reapproved 2020)Standard Test Method for Qualitative Determination ofNature of Solvent Composition in Solvent-Reducible Paints1This standard is issued under the fixed designation D2349;the number immediately following the designation indicates the year oforiginal adoption or,in t
2、he 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 This test method covers the determination of the natureof solvent in solvent-reducible hous
3、e paints containing onlyhydrocarbon solvents.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of th
4、e 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
5、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:2D215 Practice for the Chemical Analysis of White LinseedOil Paints(Withdra
6、wn 2005)3D233 Test Methods of Sampling and Testing TurpentineD1193 Specification for Reagent Water3.Significance and Use3.1 This test method provides a procedure for determiningqualitatively the composition of solvent in paints containingonly hydrocarbon solvents.4.Reagents4.1 Purity of ReagentsReag
7、ent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may beused,provided it is first
8、 ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.4.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Type IV of Specification D1193.4.3 Antimony Pentach
9、loride(SbCl5).4.4 Chloroform.4.5 Nitric Acid(sp gr 1.42)Concentrated nitric acid(HNO3).4.6 Sulfuric Acid(sp gr 1.84)Concentrated sulfuric acid(H2SO4).5.Preparation of Sample5.1 Mix and prepare the sample in accordance with PracticeD215.6.Nature of Solvent6.1 Transfer approximately 150 g of the paint
10、 to a 500-mLflask fitted with a 2-hole cork stopper carrying a spray trapconnected with a suitable condenser.Through the other hole inthe stopper pass an influx tube for steam.(This tube should dipbelow the surface of the paint.)Heat the flask in an oil or airbath at 100C and pass through it a curre
11、nt of steam;with thesteam still passing through,raise the temperature of the bath to130C.Catch the distillate in a small separatory funnel;continue distillation until 300 mL of water have been obtained.Portions of this water may be drawn from the cock of theseparatory funnel from time to time,but ca
12、re must be taken notto draw out any of the volatile solvent.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edit
13、ion approved Feb.1,2020.Published February 2020.Originallyapproved in 1965.Last previous edition approved in 2014 as D2349 90(2014).DOI:10.1520/D2349-90R20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMSta
14、ndards 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 Soci
15、ety,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 A
16、STM 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.6.2 Let the distillate stand until it separates into two layers,then draw off the water a