ASTM_D_6402_-_99_2014.pdf

Designation:D640299(Reapproved 2014)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 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 insolubles 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 asstandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.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 Total 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 Methods: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 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 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 specifiedfiltering 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 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.5.2 The specimens are aliquots from the analytical solutionsprepared from tannin extracts or the water extract solutionsprepared from raw or spent materials.1This test method is under the jurisdiction of ASTM Committee D31 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 Nov.1,2014.Published December 2014.Originallyapproved in 1999.Last previous edition approved in 2004 as D6402 99(2009).DOI:10.1520/D6402-99R14.2For 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.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,PA 19428-2959.United States1 5.3 The soluble solids are defined as the portion of the totalsolids which are dissolved in the water and pass through a filterprepared by depositing a layer of Kaolin paste onto a standardfilter paper.5.4 The insolubles are defined as the portion of the totalsolids which do not pass through the standard filter paperprepared with the layer of Kaolin paste.5.5 The results of this test method are dependent on a greatmany variables but particularly upon:5.5.1 The temperature conditions under which the solutionswere prepared and stored and the temperature at which thecurrent analysis is performed;5.5.2 The uniformity and consistency of the Kaoli