1、Designation:D287600(Reapproved 2020)Standard Test Method forWater-Soluble Matter of Vegetable-Tanned Leather1This standard is issued under the fixed designation D2876;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.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 determination of the water-soluble materials in all types of vegetable-tanned leathers.Thistest metho
3、d does not apply to wet blue.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 s
4、tandard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish a
5、ppropriate safety,health,and environ-mental practices and determine the applicability of regulatorylimitations 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 theDev
6、elopment 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 Leather3.Summary of Test Method3.1 The test method gives the amount of
7、water-solublematter extracted from the leather at 35C by 1 L of water in 3h.The leather is first freed of hexane-extractable material byextraction with hexane and leaving at ambient temperature inan exhaust hood to remove the hexane.4.Significance and Use4.1 The test method is useful for determining
8、 the water-soluble materials in vegetable-tanned leathers.4.2 The water-soluble matter includes the soluble nontan-ning components of the tanning materials used,sugars andmaterials of a similar nature,and inorganic compounds such asEpsom salts,Glaubers salts,borax,and other soluble saltsadded during
9、 curing and tannery processing.5.Apparatus5.1 Crystallizing Dish,borosilicate glass,50 mm tall,70mm in outside diameter,and weighing between 30 and 39 g.5.2 Extractor,Reed-Churchill Type3The extraction tubeshall have an internal diameter of 45 6 2 mm and a length of233 6 10 mm.See Fig.1.5.3 Water Ba
10、th,equipped to control the temperature at 35 60.5C.5.4 Circulating Air Oven,capable of maintaining a tempera-ture of 99 6 1C.6.Test Specimen6.1 The specimen shall consist of the 5-g leather sample thathas been extracted with hexane as directed in Test MethodD3495.Any deviation from this sample size
11、should be includedwith the analytical results.7.Procedure7.1 Insert a plug of cotton or glass wool in the extractiontube before the specimen is added.Place the specimen in theextraction tube,slurry,and extract at 35C by adjusting theflow to such a rate as to give 1 L of extract in 3 h.Cool theextrac
12、t to 23C,adjust to volume,and thoroughly mix.7.2 If the extract is clear,pipet 100 mL into a taredcrystallizing dish,evaporate and dry in a circulating air oven at99 6 1C for 16 to 18 h,transfer to a desiccator,cool,andweigh.1This test method is under the jurisdiction of ASTM Committee D31 on Leathe
13、rand is the direct responsibility of Subcommittee D31.01 on Vegetable Leather.Thistest method was developed in cooperation with the American Leather ChemistsAssn.(Standard Method B81954).Current edition approved Dec.1,2020.Published December 2020.Originallyapproved in 1970.Last previous edition appr
14、oved in 2016 as D2876 00(2016).DOI:10.1520/D2876-00R20.2For 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.3Reed,H.C.a
15、nd Churchill,J.B.,“An Extractor for Water Soluble in Leather,”Journal of the American Leather Chemists Association,JALCA,Vol 14,1919,p.137.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordan
16、ce 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.FIG.1 Reed-Churchill Type ExtractorD2876 00(2020)27.3 If the extract is not clear,filter it.During this andsubsequent operations,keep funnels and containers covered toprevent changes due to evaporations.Carry out all operationsat an ambien
