1、Designation: D 6020 00 (Reapproved 2005)Standard Practice forCalculation of (Non-Mineral) Combined Tanning Agents andDegree of Tannage1This standard is issued under the fixed designation D 6020; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This practic
3、e covers the determination of the combinedtannin and nonextractable organic resins and the degree oftannage of all types of vegetable-tanned leather and leatherwith organic retannages. This practice does not apply to wetblue.2. Referenced Documents2.1 ASTM Standards:D 2868 Test Method for Nitrogen C
4、ontent (Kjeldahl) andHide Substance Content of Leather2D 2875 Test Method for Insoluble Ash of Vegetable-TannedLeather2D 2876 Test Method for Water-Soluble Matter of Vegetable-Tanned Leather2D 3495 Test Method for Hexane Extraction of Leather23. Significance and Use3.1 This practice may be used to d
5、etermine non-protein ornon-nitrogen containing organic matter in leather which is notextractable with water or hexane. Examples would be veg-etable tannins and acrylic lubricants.4. Procedure4.1 The chloroform and water extractable materials andinsoluble ash in the specimen for test shall be determi
6、ned inaccordance with Test Methods D 2875, D 2876, and D 3495.4.2 The hide substance in the specimen for test shall bedetermined in accordance with Test Method D 2868.5. Calculation of Results5.1 The percentage of combined tannin in the specimenshall be calculated as follows:Combined tannin, percent
7、 5 100 2 A 1 B 1 C 1 D! (1)where:A = percent of chloroform-soluble material (mfb),B = percent of water-soluble material (mfb),C = percent of insoluble ash (mfb), andD = percent of hide substance (mfb).(mfb) = moisture free basis.5.2 The degree of tannage shall be calculated as follows:Degree of tann
8、age 5TD3 100 (2)where:T = percent of combined tannin, andD = percent of hide substance.6. Report6.1 The combined tannin in the specimen shall be reportedto the nearest 0.1 %.6.2 The degree of tannage in the specimen shall be reportedto the nearest 0.5.7. Precision and Bias7.1 This practice is adopte
9、d from Federal Test Standard No.311 Method 6631 where it has long been in use and wasapproved for publication before the inclusion of precision andbias statements was mandated. The user is cautioned to verifyby the use of reference materials, if available, that the precisionand bias (or reproducibil
10、ity) of this practice is adequate for thecontemplated use. The user should also consider precision andbias statements from each of the methods used to make thiscalculation.8. Keywords8.1 combined tannins; degree of tannage; leather; tanninanalysis; vegetable-tanned leather1This practice is under the
11、 jurisdiction ofASTM Committee D31 on Leather andis the direct responsibility of Subcommittee D31.01 on Vegetable Leather.Current edition approved Sept. 1, 2005. Published September 2005. Originallyapproved in 1996. Last previous edition approved in 2000 as D 6020 - 00.2For referenced ASTM standards
12、, 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19
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16、nown to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 6020 00 (2005)2
