1、Designation:D767414aStandard 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 of last revision.
2、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.1.2 The values st
3、ated 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-priate safety and
4、health practices and determine the applica-bility of regulatory limitations prior to use.For a specifichazard statement,see Section 7.2.Referenced Documents2.1 ASTM Standards:2D3495 Test Method for Hexane Extraction of LeatherD6658 Test Method for Volatile Matter(Moisture)of WetBlue by Oven DryingD6
5、659 Practice for Sampling and Preparation of Wet Bluefor Physical and Chemical TestsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 A specimen is analy
6、zed 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 accordance with Test Method D6658.Following completion of the extractio
7、n 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)materials in wet blue andwet white.5.Apparatus5.1 Analytical Balance.5.2 E
8、xtraction 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 maintaining thespecified temperature.5.4 Electric Hot Plate(or steam ba
9、th).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.Hazards7.1 All reagents and chemicals should be handled with care.Before
10、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 D6659.9.ProcedureNOTE1Two sample conditions are listed below.Both sample
11、 condi-tions produce acceptable results(See Precision and Bias section).9.1 Condition AAs received in wet state,diced(preparedper Test Method D6659 Method A).9.1.1 Weigh out specimen for both moisture and hexane/petroleum ether extraction at the same time.For the hexane/1This test method is under th
12、e jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.02 on Wet Blue.Current edition approved May 1,2014.Published June 2014.Originallyapproved in 2010 as E7674-10.Last previous edition approved in 2014 asE7674-14.DOI:10.1520/D7674-14A.2For referenced AS
13、TM 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
14、19428-2959.United States1 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 ap
15、paratus or the Soxtec-typeapparatus.9.1.2 Determine the moisture content of the preparedsample from which the specimen for extraction is taken(9.1.1)in accordance with Test Method D6658.NOTE2The cubed specimen weighed out for extraction may beair-dried overnight,prior to extraction.9.2 Condition BOv
16、en or air dried,ground(prepared perTest Method D6659 Method B).9.2.1 Weigh a 4-5 g specimen to the nearest 0.001g andrecord this value as W1.Loosely pack the material in anappropriately sized extraction thimble and cover with a pad offat-free cotton or glass wool.Proceed with extraction usingeither the Soxhlet apparatus or the Soxtec-type apparatus.9.2.2 Determine the residual moisture content of the pre-pared sample from which the specimen for extraction is takenin accordance with Test Method D
