ASTM_D_2617_-_17a.pdf

Designation:D261717aStandard Test Method forTotal Ash in Leather1This standard is issued under the fixed designation D2617;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of total ash inleather.1.2 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.1.3 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:2D2807 Test Method for Chromic Oxide in Leather(Perchlo-ric Acid Oxidation)D2813 Practice for Sampling Leather for Physical andChemical Tests3.Summary of Test Method3.1 The sample is ignited in air at 600 6 25 C untilconstant mass is attained.The weighed residual matter istermed“ash”and is calculated as a percentage of the originalsample.4.Significance and Use4.1 This test method is useful in determining the approxi-mate amount of nonvolatile inorganic material in leather.Thismay be in the form of salts or oxides of the elements.In amixed chrome tannage,the approximate percentage of otherelements in the leather may be determined by subtracting thechromic oxide that may be conveniently determined on the ash.(See Test Method D2807.)4.2 The temperature of 600 C specified is high enough toproduce a reproducible result but it does not completelydehydrate such oxides as aluminum oxide,(Al2O3)and chro-mic oxide(Cr2O3).Likewise,such salts as sulfates andphosphates may be incompletely dehydrated,and if alkalis andchromium are present simultaneously,oxidation to chromatemay occur.Therefore,caution is advised in drawing conclu-sions based on quantitative relations of the elements.5.Apparatus5.1 Crucible,30 to 50-mL,high-form,platinum or porce-lain.5.1.1 Suitable Glassware or Crucible,able to withstandtemperatures up to 625 C and the acids required for TestMethod D2807 may be used.5.2 Electric Furnace,with controller or rheostat andpyrometer,capable of maintaining a temperature of 600 625C.6.Test Specimen6.1 The specimen shall consist of 1 to 5 g of leather from thecomposite sample prepared in accordance with PracticeD2813.NOTE1In some leathers,silicones or other organometallic complexesthat are solvent,soluble,and ash producing are used.It may be desirableto obtain ash on an extracted sample,and if so,it should be indicated onthe report.7.Procedure7.1 Weigh accurately(to 1 mg)into a tared crucible 1 to 5g of leather,prepared as described in 6.1,and preferably atsufficiently close equilibrium with the laboratory humidity thatit does not gain or lose mass at a significant rate.Place thecrucible and sample in the furnace and maintain at 600 6 25C for a period of 4 h 6 5 min.(Note 2).Remove the cruciblefrom the furnace,cool in a desiccator,and weigh(Note 3).Record the mass.NOTE2The above procedure is satisfactory with most leathers.With1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on ChemicalAnalysis.Thistest method was developed in cooperation with the American Leather ChemistsAssn.(Standard Method B15 1969).Current edition approved Sept.1,2017.Published September 2017.Originallyapproved in 1969.Last previous edition approved in 2017 as D2617 17.DOI:10.1520/D2617-17A.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.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.1 heavily oiled or stuffed leather,start with a cold furnace and raisetemperature gradually to 600 C,or burn off the oil carefully over a gasburner before placing the crucible in the hot furnace.NOTE3If it is difficult to burn off the carbon,as evidenced byinspection,moisten the ash with a few drops of 1+1 nitric acid,dr