ASTM D4654-87(1998)
(Test Method)Standard Test Method for Sulfate Basicity in Leather
Standard Test Method for Sulfate Basicity in Leather
SCOPE
1.1 This test method is intended for use in calculating the sulfate basicity of mineral tanned leather.
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D 4654 – 87 (Reapproved 1998)
Standard Test Method for
Sulfate Basicity in Leather
This standard is issued under the fixed designation D 4654; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope average of the test results obtained from the specimens tested.
1.1 This test method is intended for use in calculating the
6. Procedure
sulfate basicity of mineral tanned leather.
6.1 The chromic oxide shall be determined as described in
1.2 This standard does not purport to address all of the
Test Method D 2807. The combined sulfate shall be deter-
safety problems, if any, associated with its use. It is the
mined as described in Method D 4655.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
7. Calculation of Results
bility of regulatory limitations prior to use.
7.1 Express the percent basicity of the specimen according
to Schorlemmer’s system. In this system, the percent basicity is
2. Referenced Documents
the percent of the total chromic oxide that is combined with
2.1 ASTM Standards:
hydroxyl. Conversely, the percent acidity is the percent of the
D 2807 Test Method for Chromic Oxide in Leather (Per-
2 total chromic acid that is combined with sulfate or other acid
chloric Acid Oxidation)
anions. Percent basicity is therefore 100 % acidity.
D 4655 Test Methods for Sulfates in Leather (Total, Neu-
tral, and Combined Acid) sulfate basicity, % 5 100 2 % combined sulfate
3 52.8/% total chromic oxide (1)
3. Significance and Use
7.2 When other metals that form hydrolysable sulfates are
3.1 This test method is used to determine the percent of total
present, add their equivalent percent of chromic oxide to the
chromic oxide that is combined with hydroxyl and may serve
chromic oxide present before calculating percent basicity. Use
as a measure of chrome fixation.
the following conversion factors: % Al O 3 1.49, %
2 3
ZrO 3 0.82, and % Fe O 3 0.95.
2 2 3
4. Apparatus and Reagents
7.3 Report the results to the nearest 0.1 %.
4.1 The apparatus and reagents shall be as described in Test
8. Precision and Bias
Methods D 2807 and D 4655.
8.1 This test method is adopted from the procedures of the
5. Sampling, Test Specimens and Test Units
American Leather Chemists A
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