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ASTM D4654-87(2009)

(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 concerns, 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
31-Mar-2009
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(2003) - Standard Test Method for Sulfate Basicity in Leather
Effective Date
01-Apr-2009
Replaced By
ASTM D4654-87(2015) - Standard Test Method for Sulfate Basicity in Leather
Effective Date
01-Sep-2015
Referred By
ASTM D4655-95(2023) - Standard Test Methods for Sulfates in Leather (Total, Neutral, and Combined Acid)
Effective Date
01-Apr-2009

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ASTM D4654-87(2009) - Standard Test Method for Sulfate Basicity in LeatherASTM D4654-87(2009) - Standard Test Method for Sulfate Basicity in Leather
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ASTM D4654-87(2009) - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 (Reapproved2009)
Standard Test Method for
Sulfate Basicity in Leather
This standard is issued under the fixed designation D4654; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5.2 Unless otherwise specified in the detail specifications,
two specimens from the composite sample shall be tested.
1.1 This test method is intended for use in calculating the
sulfate basicity of mineral tanned leather. 5.3 The percent basicity of the sample for test shall be the
average of the test results obtained from the specimens tested.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Procedure
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 6.1 The chromic oxide shall be determined as described in
bility of regulatory limitations prior to use.
TestMethodD2807.Thecombinedsulfateshallbedetermined
as described in Method D4655.
2. Referenced Documents
7. Calculation of Results
2.1 ASTM Standards:
D2807Test Method for Chromic Oxide in Leather (Perchlo-
7.1 Express the percent basicity of the specimen according
ric Acid Oxidation)
toSchorlemmer’ssystem.Inthissystem,thepercentbasicityis
D4655Test Methods for Sulfates in Leather (Total, Neutral,
the percent of the total chromic oxide that is combined with
and Combined Acid)
hydroxyl. Conversely, the percent acidity is the percent of the
total chromic acid that is combined with sulfate or other acid
3. Significance and Use
anions. Percent basicity is therefore 100% acidity.
3.1 Thistestmethodisusedtodeterminethepercentoftotal
sulfatebasicity,% 5 100 2 % combinedsulfate
chromic oxide that is combined with hydroxyl and may serve
352.8/% totalchromicoxide (1)
as a measure of chrome fixation.
7.2 When other metals that form hydrolysable sulfates are
4. Apparatus and Reagents
present, add their equivalent percent of chromic oxide to the
4.1 The apparatus and reagents shall be as described inTest chromic oxide present before calculating percent basicity. Use
Methods D2807 and D4655.
the following conversion factors: % Al O × 1.49, %
2 3
ZrO ×0.82, and% Fe O ×0.95.
2 2 3
5. Sampling, Test Specimens and Test Units
7.3 Report the results to the nearest 0.1%.
5.1 The test specimen shall be as described inTest Methods
D2807 and D4655.
8. Precision and Bias
8.1 This test method is adopt
...

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