ASTM D3643-10
(Test Method)Standard Test Method for Acid Number of Certain Alkali-Soluble Resins
Standard Test Method for Acid Number of Certain Alkali-Soluble Resins
SIGNIFICANCE AND USE
This test method is used to determine the property of maleic anhydride resins functionality. Maleic acid anhydride resins functionality determines the utility of resin as well as being a significant quality control test.
SCOPE
1.1 This test method covers the measurement of the free acidity present in certain alkali-soluble resins.
1.2 This test method is not suitable for styrene-maleic anhydride resins.
1.3 The resin manufacturer should specify whether or not this test method may be used for his product(s).
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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.
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Designation: D3643 − 10
StandardTest Method for
1
Acid Number of Certain Alkali-Soluble Resins
This standard is issued under the fixed designation D3643; 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 4. Significance and Use
1.1 This test method covers the measurement of the free 4.1 This test method is used to determine the property of
acidity present in certain alkali-soluble resins. maleic anhydride resins functionality. Maleic acid anhydride
resins functionality determines the utility of resin as well as
1.2 This test method is not suitable for styrene-maleic
being a significant quality control test.
anhydride resins.
1.3 The resin manufacturer should specify whether or not
5. Reagents and Materials
this test method may be used for his product(s).
5.1 Purity of Reagents—Reagent grade chemicals shall be
1.4 The values stated in SI units are to be regarded as
used in all tests. Unless otherwise indicated, it is intended that
standard. No other units of measurement are included in this
all reagents shall conform to the specifications of the Commit-
standard.
tee onAnalytical Reagents of theAmerican Chemical Society,
4
where such specifications are available. Other grades may be
1.5 This standard does not purport to address all of the
used, provided it is first ascertained that the reagent is of
safety concerns, if any, associated with its use. It is the
sufficiently high purity to permit its use without lessening the
responsibility of the user of this standard to establish appro-
accuracy of the determination.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean reagent water conforming
2. Referenced Documents
to Specification D1193.
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2.1 ASTM Standards:
5.3 Neutral Solvent Mixture—Mix equal parts of denatured
D362 SpecificationforIndustrialGradeToluene(Withdrawn
alcohol and industrial toluene conforming respectively to the
3
1989)
requirements described for SDA. 3A (200 proof) and Specifi-
D1152 Specification for Methanol (Methyl Alcohol)
cation D362. Neutralize the mixture using 0.1 N KOH solution
D1193 Specification for Reagent Water
and phenolphthalein indicator solution, until the faint pink
color persists for 1 min.
3. Terminology
5.4 Phenolphthalein Indicator Solution (10 g/L)—Dissolve
3.1 Definitions:
1.0 g of phenolphthalein in 100 mLof denatured alcohol (SDA
3.1.1 acid number—the number of milligrams of potassium
3A, 200 proof).
hydroxide (KOH) required to neutralize the alkali-reactive
5.5 Potassium Hydroxide, Methyl Alcohol Solution (1
groups in1gof material under the conditions of test.
mL = 5.6 mg KOH)—Dissolve 6.6 g of potassium hydroxide
3.1.1.1 Discussion—If carboxylic anhydrides are present,
(KOH) in 1 L of methyl alcohol conforming to the require-
only one half of these groups will be titrated and indicated by
ments described in Specification D1152. Standardize against
this test method.
National Institute of Standards and Technology standard
sample of acid potassium phthalate No. 84, using phenolphtha-
lein as the indicator. Do not adjust the concentration of the
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ThistestmethodisunderthejurisdictionofASTMCommitteeD21onPolishes
sol
...
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:D3643–98(Reapproved 2004) Designation: D3643 – 10
Standard Test Method for
1
Acid Number of Certain Alkali-Soluble Resins
This standard is issued under the fixed designation D3643; 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 covers the measurement of the free acidity present in certain alkali-soluble resins.
1.2 This test method is not suitable for styrene-maleic anhydride resins.
1.3 The resin manufacturer should specify whether or not this test method may be used for his product(s).
1.4
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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
2.1 ASTM Standards:
D362 Specification for Industrial Grade Toluene
D1152 Specification for Methanol (Methyl Alcohol)
D1193 Specification for Reagent Water
3. Terminology
3.1 Definition:
3.1.1 acid number—the number of milligrams of potassium hydroxide (KOH) required to neutralize the alkali-reactive groups
in1gof material under the conditions of test.
3.1.1.1 Discussion—If carboxylic anhydrides are present, only one half of these groups will be titrated and indicated by this test
method.
4. Significance and Use
4.1 This test method is used to determine the property of maleic anhydride resins functionality. Maleic acid anhydride resins
functionality determines the utility of resin as well as being a significant quality control test.
5. Reagents and Materials
5.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where
3
such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
5.2 Purity of Water—Unless otherwise indicated, references to water shall be understood to mean reagent water conforming to
Specification D1193.
5.3 Neutral Solvent Mixture—Mix equal parts of denatured alcohol and industrial toluene conforming respectively to the
requirements described for SDA. 3A (200 proof) and Specification D362. Neutralize the mixture using 0.1 N KOH solution and
phenolphthalein indicator solution, until the faint pink color persists for 1 min.
1
This test method is under the jurisdiction of ASTM Committee D21 on Polishes and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
Current edition approved Sept.May 1, 2004.2010. Published September 2004.June 2010. Originally approved in 1978. Last previous edition approved in 19982004 as
D3643 – 98(2004). DOI: 10.1520/D3643-98R04.10.1520/D3643-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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Reagent Chemicals, American Chemical Society Specifications, American Chemical Society, Washington, DC. For suggestions on the testing of reagents not listed by
the American Chemical Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia and National
Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville, MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3643 – 10
5.4 Phenolphthalein Indicator Solution (10 g/L)—Dissolve 1.0 g of phenolphthalein in 100 mLof denatured alcohol (SDA3A,
200 proof).
5.5 Potassium Hydroxide, Methyl Alcohol Solution (1 mL = 5.6 mg KOH)—Dissolve 6.6 g of potassium hydroxide (KOH) in
1 L of methyl alcohol conforming to the requirements described in Specification D1152. Standardize against National Institute of
Standards and Technology standard sample of acid potassium ph
...
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