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ASTM D4654-87(2015)

(Test Method)

Standard Test Method for Sulfate Basicity in Leather

Standard Test Method for Sulfate Basicity in Leather

SIGNIFICANCE AND USE
3.1 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-Aug-2015
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(2009) - Standard Test Method for Sulfate Basicity in Leather
Effective Date
01-Sep-2015
Replaced By
ASTM D4654-87(2020) - Standard Test Method for Sulfate Basicity in Leather
Effective Date
01-Apr-2020
Referred By
ASTM D4655-95(2023) - Standard Test Methods for Sulfates in Leather (Total, Neutral, and Combined Acid)
Effective Date
01-Sep-2015

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ASTM D4654-87(2015) - Standard Test Method for Sulfate Basicity in Leather
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Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 (Reapproved 2015)
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
5.3 The percent basicity of the sample for test shall be the
sulfate basicity of mineral tanned leather.
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-
6.1 The chromic oxide shall be determined as described in
priate safety and health practices and determine the applica-
TestMethodD2807.Thecombinedsulfateshallbedetermined
bility of regulatory limitations prior to use.
as described in Method D4655.
2. Referenced Documents
7. Calculation of Results
2.1 ASTM Standards: 7.1 Express the percent basicity of the specimen according
D2807Test Method for Chromic Oxide in Leather (Perchlo-
toSchorlemmer’ssystem.Inthissystem,thepercentbasicityis
ric Acid Oxidation) the percent of the total chromic oxide that is combined with
D4655Test Methods for Sulfates in Leather (Total, Neutral,
hydroxyl. Conversely, the percent acidity is the percent of the
and Combined Acid) total chromic acid that is combined with sulfate or other acid
anions. Percent basicity is therefore 100% acidity.
3. Significance and Use
sulfatebasicity,% 5 100 2 % combinedsulfate
3.1 Thistestmethodisusedtodeterminethepercentoftotal
352.8/% totalchromicoxide (1)
chromic oxide that is combined with hydroxyl and may serve
7.2 When other metals that form hydrolysable sulfates are
as a measure of chrome fixation.
present, add their equivalent percent of chromic oxide to the
chromic oxide present before calculating percent basicity. Use
4. Apparatus and Reagents
the following conversion factors: % Al O × 1.49, %
2 3
4.1 The apparatus and reagents shall be as described inTest
ZrO ×0.82, and% Fe O ×0.95.
2 2 3
Methods D2807 and D4655.
7.3 Report the results to the nearest 0.1%.
5. Sampling, Test Specimens and Test Units
8. Precision and Bias
5.1 The test specimen shall be as described inTest Methods
8.1 This test method is adopted from the
...


This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D4654 − 87 (Reapproved 2009) D4654 − 87 (Reapproved 2015)
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. 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.
2. Referenced Documents
2.1 ASTM Standards:
D2807 Test Method for Chromic Oxide in Leather (Perchloric Acid Oxidation)
D4655 Test Methods for Sulfates in Leather (Total, Neutral, and Combined Acid)
3. Significance and Use
3.1 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.
4. Apparatus and Reagents
4.1 The apparatus and reagents shall be as described in Test Methods D2807 and D4655.
5. Sampling, Test Specimens and Test Units
5.1 The test specimen shall be as described in Test Methods D2807 and D4655.
5.2 Unless otherwise specified in the detail specifications, two specimens from the composite sample shall be tested.
5.3 The percent basicity of the sample for test shall be the average of the test results obtained from the specimens tested.
6. Procedure
6.1 The chromic oxide shall be determined as described in Test Method D2807. The combined sulfate shall be determined as
described in Method D4655.
7. Calculation of Results
7.1 Express the percent basicity of the specimen according to Schorlemmer’s system. In this system, the percent basicity is the
percent of the total chromic oxide that is combined with hydroxyl. Conversely, the percent acidity is the percent of the total chromic
acid that is combined with sulfate or other acid anions. Percent basicity is therefore 100 % acidity.
sulfate basicity,%5 100 2 % combined sulfate 352.8/% total chromic oxide (1)
7.2 When other metals that form hydrolysable sulfates are present, add their equivalent percent of chromic oxide to the chromic
oxide present before calculating percent basicity. Use the following conversion factors: % Al O × 1.49, % ZrO ×
...

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