1、Designation: D6020 00 (Reapproved 2016)Standard Practice forCalculation of (Non-Mineral) Combined Tanning Agents andDegree of Tannage1This standard is issued under the fixed designation D6020; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This pract
3、ice 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:2D2868 Test Method for Nitrogen
4、 Content (Kjeldahl) andHide Substance Content of Leather, Wet Blue and WetWhiteD2875 Test Method for Insoluble Ash of Vegetable-TannedLeatherD2876 Test Method for Water-Soluble Matter of Vegetable-Tanned LeatherD3495 Test Method for Hexane Extraction of Leather3. Significance and Use3.1 This practic
5、e may be used to determine 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 tes
6、t shall be determined inaccordance with Test Methods D2875, D2876, and D3495.4.2 The hide substance in the specimen for test shall bedetermined in accordance with Test Method D2868.5. Calculation of Results5.1 The percentage of combined tannin in the specimenshall be calculated as follows:Combined t
7、annin, percent 5 100 2 A1B1C1D! (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
8、 of tannage 5TD3100 (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
9、 adopted 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 repr
10、oducibility) 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 u
11、nder the jurisdiction ofASTM Committee D31 on Leather andis the direct responsibility of Subcommittee D31.01 on Vegetable Leather.Current edition approved Sept. 1, 2016. Published October 2016. Originallyapproved in 1996. Last previous edition approved in 2010 as D6020 - 00 (2010).DOI: 10.1520/D6020
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