ASTM_D_1686_-_19.pdf

Designation:D168619Standard Test Method forColor of Solid Aromatic Hydrocarbons and Related Materialsin the Molten State(Platinum-Cobalt Scale)1This standard is issued under the fixed designation D1686;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 visual measurement of thecolor of thermally stable solids melting below 150C.It isapplicable only to materials in which the color-producingbodies present have light absorption characteristics quite simi-lar to those of the standards used.The scope of this methodcovers the range of calibration which is 0 to 100 Pt-Co color.1.2 In determining the conformance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.Weight%should be used rather than Mass%.1.4 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 Sections 7 and 9.1.5 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:2D1193 Specification for Reagent WaterD3438 Practice for Sampling and Handling Naphthalene,Maleic Anhydride,and Phthalic AnhydrideD3852 Practice for Sampling and Handling Phenol,Cresols,and Cresylic AcidD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsD8005 Test Method for Color of Clear Liquids(Platinum-Cobalt Scale)E29 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 and1910.120033.Significance and Use3.1 Color by this test method is a measure of color-producing impurities present in the thermally stable solids.This test method is suitable for setting specifications and foruse as an internal quality control tool.4.Apparatus4.1 Color Comparison TubesMatched 100-mL,tall-formNessler tubes,provided with ground-on,optically clear,glasscaps.Tubes should be selected so that the height of the 100-mLgraduation mark is 300 6 3 mm above the bottom of the tube.The use of heat-resistant tubes is preferred for safety reasons.4.2 Color ComparatorA color comparator constructed topermit visual comparison of light transmitted through tall-form,100-mL Nessler tubes in the direction of their longitu-dinal axes.The comparator should be constructed so that whitelight is reflected off a white plate and directed with equalintensity through the tubes,and should be shielded so that nolight enters the tubes from the side.4.3 OvenAn oven,preferably of the forced draft type andcapable of maintaining a constant temperature 61C in therange up to 150C.Alternatively,the use of an aluminum1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.02 on Oxygenated Aromatics.Current edition approved Jan.15,2019.Published February 2019.Originallyapproved in 1959.Last previous edition approved in 2010 as D1686 10.DOI:10.1520/D1686-19.2For 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.3Available 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.1 heating block provided with proper temperature control orother similar equipment is permissib