1、Designation:D767414a(Reapproved 2021)Standard Test Method forHexane/Petroleum Ether Extract in Wet Blue and Wet White1This standard is issued under the fixed designation D7674;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、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 quantitative extraction of alltypes of wet blue and wet white with hexane or petroleumether.
3、1.2 The values stated in SI units are to be regarded as thestandard.The values 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-p
4、riate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For a specific hazard statement,see Section 7.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establishe
5、d 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:2D3495 Test Method for Hexane Extraction of LeatherD6658 Test Method for
6、Volatile Matter(Moisture)of WetBlue by Oven DryingD6659 Practice for Sampling and Preparation of Wet Blueand Wet White for Physical and Chemical TestsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precisi
7、on of a Test Method3.Summary of Test Method3.1 A specimen is analyzed as received in wet state,diced;or pre-dried at the determined setting then ground prior toanalysis.The prepared specimen is extracted with solvent.Another specimen from the same sample is also analyzed formoisture content in accor
8、dance with Test Method D6658.Following completion of the extraction process,the extract isdried,then cooled and weighed.The extract is reported asextractables on a moisture-free basis.4.Significance and Use4.1 This test method measures the amount of solvent-soluble(hexane or petroleum ether)material
9、s in wet blue andwet white.5.Apparatus5.1 Analytical Balance.5.2 Extraction ApparatusSoxhlet,consisting of a boilingflask,extraction tube,and condenser.Alternate ExtractionApparatus:Soxtec-type system consisting of an extraction unitand a control unit.5.3 Forced Circulating Air Oven,capable of maint
10、aining thespecified temperature.5.4 Electric Hot Plate(or steam bath).5.5 Extraction Thimbles,fat-free:cellulose,Alundum,glassmicrofiber,or fritted glass.5.6 Absorbent Cotton,fat-free,or glass wool.6.Reagents and Materials6.1 Hexane,ACS Reagent Grade,or6.2 Petroleum Ether,ACS Reagent Grade.7.Hazards
11、7.1 All reagents and chemicals should be handled with care.Before using any chemical,read and follow all safety precau-tions and instructions on the manufacturers label or MSDS(Material Safety Data Sheet).8.Sampling8.1 The wet blue or wet white shall be sampled in accor-dance with Test Method D6659.
12、9.ProcedureNOTE1Two sample conditions are listed below.Both sample condi-tions produce acceptable results(See Precision and Bias section).1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.02 on Wet Blue.Current edition ap
13、proved Sept.1,2021.Published October 2021.Originallyapproved in 2010 as E7674-10.Last previous edition approved in 2014 asE7674-14a.DOI:10.1520/D7674-14AR21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMSt
14、andards 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
15、 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.19.1 Condition AAs received in wet state,diced(preparedper Test Method D6659 Method A).
16、9.1.1 Weigh out specimen for both moisture and hexane/petroleum ether extraction at the same time.For the hexane/petroleum ether extraction,weigh an 8-10 g specimen to thenearest 0.001g and record this value as W1.Loosely pack thematerial in an appropriately sized extraction thimble and coverwith a pad of fat-free cotton or glass wool.Proceed withextraction using either the Soxhlet apparatus or the Soxtec-typeapparatus.9.1.2 Determine the moisture content of the preparedsample from which the spe