1、Designation:D640299(Reapproved 2020)Standard Test Method forDetermining Soluble Solids and Insolubles in Extracts ofVegetable Tanning Materials1This standard is issued under the fixed designation D6402;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、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.Scope1.1 This test method is intended for use in determining thequantity of soluble solids and insolubl
3、es in solutions of tanninextracts,water extracts of vegetable tanning materials,ortanning liquors.This test method is applicable to the analysisof liquid,solid,pasty,and powdered tannin extracts and to thewater extracts of raw or spent materials.1.2 The values stated in SI units are to be regarded a
4、sstandard.No other units of measurement are included in thisstandard.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,health,and environmental practices and det
5、er-mine the applicability of regulatory limitations prior to use.1.4 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-mendat
6、ions issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4901 Practice for Preparation of Solution of Liquid Veg-etable Tannin ExtractsD4902 Test Method for Evaporation and Drying of Analyti-cal SolutionsD4903 Test Method for Tot
7、al Solids and Water in VegetableTanning Material ExtractsD4905 Practice for Preparation of Solution of Solid,Pastyand Powdered Vegetable Tannin ExtractsD6403 Test Method for Determining Moisture in Raw andSpent MaterialsD6405 Practice for Extraction of Tannins from Raw andSpent Materials2.2 ALCA Met
8、hods:A21 Soluble Solids and Insolubles33.Terminology3.1 Definitions:3.1.1 insolublesnon-volatile materials present in tanninextracts and raw or spent materials that are dissolved orsuspended in water and do not pass through a filtering processdescribed in this method.3.1.2 soluble solidsnon-volatile
9、 materials present in tan-nin extracts and raw or spent materials that are dissolved orsuspended in water and pass through a filtering processdescribed in this method.4.Summary of Test Method4.1 An aliquot of the analytical solution prepared fromtannin extracts(Practices D4901 or D4905)or the water
10、extractfrom raw or spent materials(Practice D6405)is dried overnightin a forced-air oven(Test Method D4902)and the quantity ofsolid residue remaining is determined and used to calculate thetotal solids for that sample(Test Method D4903).Anotheraliquot of the same solution is passed through a specifi
11、edfiltering procedure and the quantity of solid residue remainingin the filtrate is determined and used to calculate the solublesolids for that sample.The difference between the total solidsand the soluble solids is defined as the insolubles for thatsample.5.Significance and Use5.1 This test method
12、is used to determine the proportion ofthe total solids which are soluble solids and that proportionwhich are insoluble solids in a solution of tannin extract or inthe water extract from raw or spent materials prepared fortannin analysis.1This test method is under the jurisdiction of ASTM Committee D
13、31 on Leatherand is the direct responsibility of Subcommittee D31.01 on Vegetable Leather.Thistest method has been adapted from and is a replacement for Method A21 of theOfficial Methods of the American Leather Chemists Association.Current edition approved Dec.1,2020.Published December 2020.Original
14、lyapproved in 1999.Last previous edition approved in 2014 as D6402 99(2014).DOI:10.1520/D6402-99R20.2For 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 Documen
15、t Summary page onthe ASTM website.3Official Methods of the American Leather Chemists Association.Availablefrom the American Leather Chemists Association,University of Cincinnati,P.O.Box 210014,Cincinnati,OH 45221-0014.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,P
16、A 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.15.2 The specimens are aliquots from the analytical solutionsprepared from tannin extracts or the water extract solutionsprepared from raw or spent materials.5.
