1、Designation:D640499(Reapproved 2020)Standard Practice forSampling Vegetable Materials Containing Tannin1This standard is issued under the fixed designation D6404;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.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 practice covers obtaining representative samplesfrom shipment lots of botanical materials containing tannin.1.2 The values stated
3、 in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.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 thi
4、s standard to establish appro-priate safety,health,and environmental practices and deter-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 Decisi
5、on 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:2D1517 Terminology Relating to Leather2.2 ALCA Method:J10 Sampling Vegetable Materials C
6、ontaining Tannin33.Terminology3.1 Definitions:3.1.1 For definitions of general leather and tanning termsused in this practice refer to Terminology D1517.3.1.2 quarteringthe term applied to a method described inthis practice of reducing the size of samples without impairingtheir representative qualit
7、y.3.1.3 tanninan astringent substance found in the variousparts of plants such as bark,wood,leaves,nuts,fruits,roots,etc.3.1.4 vegetable tanninsmixtures of substances(naturalproducts)obtained from plant tissues by water extractionwhich have the chemical and physical properties necessary toconvert an
8、imal hides and skins into leather.4.Summary of Practice4.1 This practice describes methods for obtaining represen-tative samples for analysis from shipments of vegetable tan-ning materials and tannin extracts.5.Significance and Use5.1 This practice provides standard procedures for obtainingrepresent
9、ative samples of various materials used as a source oftannins for the tanning industry.5.2 Procedures are described for obtaining representativesamples of economical and convenient quantities from a lot,orsections of a lot,of material for examination and analysis sothat agreement may be reached with
10、 regard to the extent ofvariation of quality in different portions of a lot and the averagequality of the entire lot of material.5.3 No directions for sampling,however explicit,can takethe place of judgment,skill,and previous experience on thepart of persons actually engaged in the sampling or thesu
11、pervision of the sampling.These directions are intended tosupplement that experience and,particularly,to serve as aguide in the selection of the method which is to be used,incommon,by each of two or more contracting parties.5.4 Tanning materials contain moisture in varying amounts,depending both on
12、the nature of the material and on theclimatic conditions,so that sampling must be carried out asquickly as is consistent with thoroughness in order to avoidchanges in moisture content.6.Apparatus6.1 Balance,analytical balance which will weigh the quan-tity of material specified in this practice to a
13、n accuracy of 610g(6 0.35 oz).6.2 Canvas,11-oz weight and of sufficient size(as deter-mined by the discretion of the sampler or analyst)for use inmixing and quartering samples.1This practice is under the jurisdiction ofASTM Committee D31 on Leather andis the direct responsibility of Subcommittee D31
14、.01 on Vegetable Leather.This testmethod has been adapted from and is a replacement for Method J10 of the OfficialMethods of the American Leather Chemists Association.Current edition approved Dec.1,2020.Published December 2020.Originallyapproved in 1999.Last previous edition approved in 2014 as D640
15、4 99(2014).DOI:10.1520/D6404-99R20.2For 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 Document Summary page onthe ASTM website.3Official Methods of the Americ
16、an 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 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