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ASTM D4654-87(2003)

(Test Method)

Standard Test Method for Sulfate Basicity in Leather

Standard Test Method for Sulfate Basicity in Leather

SIGNIFICANCE AND USE
This test method is used to determine the percent of total chromic oxide that is combined with hydroxyl and may serve as a measure of chrome fixation.
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.

General Information

Status
Historical
Publication Date
09-May-2003
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.06 - Chemical Analysis
Current Stage
Ref Project

Relations

Replaces
ASTM D4654-87(1998) - Standard Test Method for Sulfate Basicity in Leather
Effective Date
10-May-2003
Replaced By
ASTM D4654-87(2009) - Standard Test Method for Sulfate Basicity in Leather
Effective Date
01-Apr-2009
Referred By
ASTM D4655-95(2023) - Standard Test Methods for Sulfates in Leather (Total, Neutral, and Combined Acid)
Effective Date
10-May-2003

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ASTM D4654-87(2003) - Standard Test Method for Sulfate Basicity in LeatherASTM D4654-87(2003) - Standard Test Method for Sulfate Basicity in Leather
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ASTM D4654-87(2003) - Standard Test Method for Sulfate Basicity in Leather
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D4654–87(Reapproved2003)
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 5.3 The percent basicity of the sample for test shall be the
average of the test results obtained from the specimens tested.
1.1 This test method is intended for use in calculating the
sulfate basicity of mineral tanned leather.
6. Procedure
1.2 This standard does not purport to address all of the
6.1 The chromic oxide shall be determined as described in
safety concerns, if any, associated with its use. It is the
Test Method D 2807. The combined sulfate shall be deter-
responsibility of the user of this standard to establish appro-
mined as described in Method D 4655.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
7. Calculation of Results
7.1 Express the percent basicity of the specimen according
2. Referenced Documents
toSchorlemmer’ssystem.Inthissystem,thepercentbasicityis
2.1 ASTM Standards:
the percent of the total chromic oxide that is combined with
D 2807 Test Method for Chromic Oxide in Leather (Per-
hydroxyl. Conversely, the percent acidity is the percent of the
chloric Acid Oxidation)
total chromic acid that is combined with sulfate or other acid
D 4655 Test Methods for Sulfates in Leather (Total, Neu-
anions. Percent basicity is therefore 100 % acidity.
tral, and Combined Acid)
sulfate basicity, % 5 100 2 % combined sulfate
3. Significance and Use
3 52.8/% total chromic oxide (1)
3.1 This test method is used to determine the percent of total
7.2 When other metals that form hydrolysable sulfates are
chromic oxide that is combined with hydroxyl and may serve
present, add their equivalent percent of chromic oxide to the
as a measure of chrome fixation.
chromic oxide present before calculating percent basicity. Use
the following conversion factors: % Al O 3 1.49, %
2 3
4. Apparatus and Reagents
ZrO 3 0.82, and % Fe O 3 0.95.
2 2 3
4.1 The apparatus and reagents shall be as described in Test
7.3 Report the results to the nearest 0.1 %.
Methods D 2807 and D 4655.
8. Precision and Bias
5. Sampling, Test Specimens and
...

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