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Designation: D6017 − 97 (Reapproved 2026)Standard Test Method forDetermination of Magnesium Sulfate (Epsom Salt) inLeather 1This standard is issued under the f i xed designation D6017; 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This test method covers quantitatively determining themagnesium sulfate (epsom salt) in leather.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, 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 Decision 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: 2D3790 Test Method for Volatile Matter (Moisture) ofLeather by Oven Drying2.2 Federal Standards:Federal Test Standard No. 311, Method 6541 MagnesiumSulfate (Epsom Salt) 33. Signif i cance and Use3.1 This test method distinguishes magnesium sulfate fromother water soluble non-tanning salts found in leather.4. Apparatus4.1 Platinum Crucible.4.2 Filtering Crucible.4.3 Suction Flask.4.4 Muffle Furnace.5. Reagents5.1 Hydrochloric Acid, specif i c gravity 1.19.5.2 Nitric Acid, specif i c gravity 1.42.5.3 Ammonium Chloride.5.4 Ammonium Hydroxide, 1 to 1 and 1 to 9 parts by volumewith distilled water.5.5 Ammonium Nitrate Solution, 10 g dissolved in distilledwater and made up to 100 mL.5.6 Ammonium Oxalate, saturated solution.5.7 Ferric Chloride Solution, 10 g dissolved in distilledwater and made up to 100 mL.5.8 Methyl Orange Indicator, 0.05 %.5.9 Sodium Ammonium Hydrogen Phosphate, saturated so-lution.6. Procedure6.1 Unless otherwise specif i ed in the material specif i cation,determine the moisture content of the composite sample fromwhich the test specimen is drawn, in accordance with TestMethod D3790. Determine the weight of the composite speci-mens for moisture content at the same time and under the sameambient conditions as the specimens weighed for chemicaltests.6.2 Place the specimen in a tared porcelain crucible, 5 gweighed to the nearest 0.001 g, and record the value as W 2 .Place the weighed specimen in a cold muffle furnace orprecarbonize over a burner prior to placing in a hot furnace.Gradually raise the temperature of the furnace to 600 °C 625 °C and maintain at this temperature for 60 min. Remove thecrucible and contents, cool in a desiccator, and weigh. Replacein the furnace at 600 °C 6 25 °C for 30 min and repeat the1 This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on ChemicalAnalysis. Thistest method was developed from Federal Test Method Standard No. 311,Method 6541 in cooperation with the U.S. Army Natick Research Development &Engineering Center, Natick MA and the Defense Personnel Support CenterDirectorate of Clothing and Textiles, Philadelphia PA.Current edition approved July 1, 2026. Published July 2026. Originally approvedin 1996. Last previous edition approved in 2020 as D6017 – 97 (2020) ?1 . DOI:10.1520/D6017-97R26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.3 Available from https://quicksearch.dla.mil.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 by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1