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ASTM D7389-07(2019)

(Test Method)

Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes

Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes

SIGNIFICANCE AND USE
4.1 This test method is used to determine the free acid content of MAH-grafted waxes. The potential hydrolysis of the anhydride functionality of this wax in storage makes them unsuitable for determining free acid content by Test Method D1386. Free acid content is a significant quality control test, and is a determinant of the utility of the wax.
SCOPE
1.1 This test method covers the determination of the acid number of maleic anhydride (MAH) grafted waxes. The number is obtained by direct titration of the material and indicates the amount of free acid present.  
1.2 This test method is applicable to MAH-grafted waxes because it uses a special sample preparation step (7.1) that is not required for other waxes. The special sample preparation reverses the hydrolysis of acid anhydride that can occur during storage of the wax.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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.

General Information

Status
Published
Publication Date
30-Jun-2019
ICS
75.140 - Waxes, bituminous materials and other petroleum products
Technical Committee
D21 - Polishes
Drafting Committee
D21.02 - Raw Materials
Current Stage
Ref Project

Relations

Replaces
ASTM D7389-07(2012) - Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
Effective Date
01-Jul-2019
Refers
ASTM D1386-10 - Standard Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes
Effective Date
01-May-2010
Refers
ASTM D1386-98(2004) - Standard Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes
Effective Date
01-Sep-2004
Refers
ASTM D1386-98 - Standard Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes
Effective Date
10-Sep-1998

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ASTM D7389-07(2019) - Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted WaxesASTM D7389-07(2019) - Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
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ASTM D7389-07(2019) - Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
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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.
Designation: D7389 − 07 (Reapproved 2019)
Standard Test Method for
Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted
Waxes
This standard is issued under the fixed designation D7389; 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 3. Terminology
3.1 Definitions:
1.1 This test method covers the determination of the acid
3.1.1 acid number or acid value—the number of milligrams
number of maleic anhydride (MAH) grafted waxes. The
of potassium hydroxide necessary to neutralize1gofthe
number is obtained by direct titration of the material and
sample.
indicates the amount of free acid present.
1.2 This test method is applicable to MAH-grafted waxes
4. Significance and Use
because it uses a special sample preparation step (7.1) that is
4.1 This test method is used to determine the free acid
not required for other waxes. The special sample preparation
content of MAH-grafted waxes.The potential hydrolysis of the
reverses the hydrolysis of acid anhydride that can occur during
anhydride functionality of this wax in storage makes them
storage of the wax.
unsuitable for determining free acid content by Test Method
1.3 The values stated in SI units are to be regarded as
D1386. Free acid content is a significant quality control test,
standard. No other units of measurement are included in this
and is a determinant of the utility of the wax.
standard.
1.4 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Analytical Balance.
responsibility of the user of this standard to establish appro-
5.2 Buret, 50-mL, with 0.1-mL graduations.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5.3 Flasks, acid value, 250-mL.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
6. Reagents and Materials
ization established in the Decision on Principles for the
6.1 Purity of Reagents—Reagent-grade chemicals or
Development of International Standards, Guides and Recom-
equivalent, as specified in Practice E200, shall be used in all
mendations issued by the World Trade Organization Technical
tests.
Barriers to Trade (TBT) Committee.
6.2 Ethanolic Potassium Hydroxide, Standard Solution (0.1
N)—Dissolve 6.6 g of potassium hydroxide in 5.6 g of distilled
2. Referenced Documents
water. Dilute with USSD3Adenatured ethanol or 95 % ethanol
2.1 ASTM Standards:
to 1000 mL. Standardize with 0.1 N hydrochloric acid.
D1386 Test Method for Acid Number (Empirical) of Syn-
6.3 Phenolphthalein Indicator Solution (10 g/litre)—
thetic and Natural Waxes
Dissolve1gof phenolphthalein in 100 mL of USSD3A,
E200 Practice for Preparation, Standardization, and Storage
denatured ethanol or 95 % ethanol.
of Standard and Reagent Solutions for ChemicalAnalysis
6.4 Xylene.
7. Sample Preparation
This test method is under the jurisdiction ofASTM Committee D21 on Polishes
and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
7.1 Melt20gofthesamplewaxina250-mLflaskorbeaker
Current edition approved July 1, 2019. Published July 2019. Originally approved
and heat to 180–190°C. Apply a slight vacuum as the wax
in 2007. La
...

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