ASTM D2617-17a

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Designation: D2617 − 17 D2617 − 17a
Standard Test Method for
Total Ash in Leather
This standard is issued under the fixed designation D2617; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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. Scope
1.1 This test method covers the determination of total ash in leather.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D2807 Test Method for Chromic Oxide in Leather (Perchloric Acid Oxidation)
D2813 Practice for Sampling Leather for Physical and Chemical Tests
3. Summary of Test Method
3.1 The sample is ignited in air at 600 6 25 °C until constant mass is attained. The weighed residual matter is termed “ash”
and is calculated as a percentage of the original sample.
4. Significance and Use
4.1 This test method is useful in determining the approximate amount of nonvolatile inorganic material in leather. This may be
in the form of salts or oxides of the elements. In a mixed chrome tannage, the approximate percentage of other elements in the
leather may be determined by subtracting the chromic oxide that may be conveniently determined on the ash. (See Test Method
D2807.)
4.2 The temperature of 600 °C specified is high enough to produce a reproducible result but it does not completely dehydrate
such oxides as aluminum oxide, (Al O ) and chromic oxide (Cr O ). Likewise, such salts as sulfates and phosphates may be
2 3 2 3
incompletely dehydrated, and if alkalis and chromium are present simultaneously, oxidation to chromate may occur. Therefore,
caution is advised in drawing conclusions based on quantitative relations of the elements.
5. Apparatus
5.1 Crucible, 30 to 50-mL, high-form, platinum or porcelain.
5.1.1 Suitable Glassware or Crucible, able to withstand temperatures up to 625 °C and the acids required for Test Method
D2807 may be used.
5.2 Electric Muffle Furnace, with controller or rheostat and pyrometer, capable of maintaining a temperature of 600 6 25°C.
6. Test Specimen
6.1 The specimen shall consist of 1 to 5 g of leather from the composite sample prepared in accordance with Practice D2813.
NOTE 1—In some leathers, silicones or other organometallic complexes that are solvent, soluble, and ash producing are used. It may be desirable to
This test method is under the jurisdiction of ASTM Committee D31 on Leather and is the direct responsibility of Subcommittee D31.06 on Chemical Analysis. This test
method was developed in cooperation with the American Leather Chemists Assn. (Standard Method B15 – 1969).
Current edition approved April 1, 2017Sept. 1, 2017. Published May 2017September 2017. Originally approved in 1969. Last previous edition approved in 20122017 as
D2617 – 12.D2617 – 17. DOI: 10.1520/D2617-17.10.1520/D2617-17A.
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D2617 − 17a
obtain ash on an extracted sample, and if so, it should be indicated on the report.
7. Procedure
7.1 Weigh accurately (to 1 mg) into a tared crucible 1 to 5 g of leather, prepared a
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