ASTM_D_852_-_20.pdf

Designation:D85220Standard Test Method forSolidification Point of Benzene1This standard is issued under the fixed designation D852;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.Scope*1.1 This test method covers the determination of the solidi-fication point of benzene.1.2 The following applies for the purposes of determiningthe conformance of the test results using this test method toapplicable specifications,results shall be rounded off in accor-dance with the rounding-off method of Practice E29.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 WarningMercury has been designated by many regu-latory agencies as a hazardous substance that can causeserious medical issues.Mercury,or its vapor,has beendemonstrated to be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercuryand mercury containing products.See the applicable productSafety Data Sheet(SDS)for additional information.Usersshould be aware that selling mercury and/or mercury contain-ing products into your state or country may be prohibited bylaw.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.For specific hazard statements,see Section 7.1.6 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Documents2.1 ASTM Standards:2D1015 Test Method for Freezing Points of High-PurityHydrocarbons(Withdrawn 2019)3D1016 Test Method for Purity of Hydrocarbons from Freez-ing Points(Withdrawn 2019)3D1193 Specification for Reagent WaterD3437 Practice for Sampling and Handling Liquid CyclicProductsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE1 Specification for ASTM Liquid-in-Glass ThermometersE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120043.Terminology3.1 Definitions:3.1.1 solidification point,nan empirical constant definedas the temperature at which the liquid phase of a substance isin approximate equilibrium with a relatively small portion ofthe solid phase.3.1.1.1 DiscussionSolidification point is distinguishedfrom freezing point which is described in Test Method D1015.An interpretation of mol percent purity in terms of freezingpoint is given in Test Method D1016.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane andTheir Derivatives.Current edition approved Oct.1,2020.Published October 2020.Originallyapproved in 1945.Last previous edition approved in 2016 as D852 16.DOI:10.1520/D0852-20.2For 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.4Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.*A Summary of Changes section appears at the end of this standardCopyright 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.14.Summary of Test Method4.1 Solidification point is measured by noting the maximumtemperature reached during a controlled cooling cycle after theappearance of a solid phase.5.Significance and Use5.1 This test method may be used as a criteria for determin-ing the purity of benzene.The closer the solidification pointreaches that of pure benzene,the purer the sample.6.Apparatus6.1 Benzene Container(Air Jacketed):6.1.1 Inner Co