ASTM D4370-01(2017)
(Test Method)Standard Test Methods for Acid and Base Milliequivalent Content of Electrocoat Bath
Standard Test Methods for Acid and Base Milliequivalent Content of Electrocoat Bath
SIGNIFICANCE AND USE
4.1 The acid and base concentrations are a measurement of the titratable acidic and alkaline components in the electrocoat baths. These measurements are used for research, production or electrocoat bath process control.
SCOPE
1.1 These test methods cover the determination of acid and base milliequivalent contents of anodic and cathodic electrocoat baths and their ultrafiltrates.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.
1.4 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
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Designation: D4370 − 01 (Reapproved 2017)
Standard Test Methods for
1
Acid and Base Milliequivalent Content of Electrocoat Bath
This standard is issued under the fixed designation D4370; 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 baths. These measurements are used for research, production or
electrocoat bath process control.
1.1 These test methods cover the determination of acid and
base milliequivalent contents of anodic and cathodic electro-
5. Apparatus
coat baths and their ultrafiltrates.
5.1 Automatic Potentiometric Titrator with Stirrer and
1.2 The values stated in SI units are to be regarded as
Recorder, any model.
standard. No other units of measurement are included in this
5.2 Analytical Balance, with sensitivity of 0.1 mg.
standard.
5.3 pH Meter, any model.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5.4 Glass and Saturated Calomel Electrodes.
responsibility of the user of this standard to establish appro-
5.5 Syringes, 5-mL disposable.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
6. Reagents
1.4 This international standard was developed in accor-
6.1 Purity of Reagents—Reagent grade chemicals shall be
dance with internationally recognized principles on standard-
used in all tests. Unless otherwise indicated, it is intended that
ization established in the Decision on Principles for the
all reagents shall conform to the specifications of the Commit-
Development of International Standards, Guides and Recom-
tee on Analytical Reagents of the American Chemical Society,
mendations issued by the World Trade Organization Technical
3
where such specifications are available.
Barriers to Trade (TBT) Committee.
Other grades may be used, provided it is ascertained that the
reagent is of sufficiently high purity to permit its use without
2. Referenced Documents
2 lessening the accuracy of the determination.
2.1 ASTM Standards:
6.2 Purity of Water—References to water shall be under-
D1193 Specification for Reagent Water
stood to mean water conforming to Type II of Specification
3. Summary of Test Methods
D1193.
3.1 Specimens are titrated with standard acid and alkali
6.3 Potassium Hydroxide Solution in Methanol, 0.1
solutions respectively. Alternative procedures are given for
N—Prepare by dissolving 5.6 g of potassium hydroxide (KOH)
determining acid and base concentrations potentiometrically or
pellets in 1 L of methanol. Standardize against NIST standard
using a pH meter.
reference material of acid potassium phthalate No. 84 using an
4
automatic potentiometric titrator to a given end point or,
4. Significance and Use
alternatively, to a phenolphthalein end point.
4.1 The acid and base concentrations are a measurement of
6.4 Hydrochloric Acid Solution , 0.1 N—Prepare by mixing
the titratable acidic and alkaline components in the electrocoat
about 8.50 mL of concentrated hydrochloric acid (HCl) (1.19
sp gr) into a mixture of 600 mL water and 400 mL methanol.
Standardize against 0.1 N potassium hydroxide solution (see
1
These test methods are under the jurisdiction of ASTM Committee D01 on
6.3).
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Subcommittee D01.21 on Chemical Analysis of Paints and Paint
Materials.
3
Current edition approved Dec. 1, 2017. Published December 2017. Originally Reagent Chemicals, American Chemical Society Specifications, American
approved in 1984. Last previous edition approved in 2012 as D4370 – 01 (2012). Chemical Society, Washington, DC. For suggestions on the testing of reagents not
DOI: 10.1520/D4370-01R17. listed by the American Chemical Society, see Analar Standards for Laboratory
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Standards volume information, refer to the standard’s Document Summary page on MD.
4
the ASTM website. Svehla, G., Automatic Potentiometric Titration, Pergamon Press, 1978, p. 187.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D4370 − 01 (2017)
6.5 1,3-Propanediol (Propylene Glycol) (PG).
6.6 Tetrahydrofuran (THF).
6.7 Reference pH Standard Solutions—Commer
...
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: D4370 − 01 (Reapproved 2012) D4370 − 01 (Reapproved 2017)
Standard Test Methods for
1
Acid and Base Milliequivalent Content of Electrocoat Bath
This standard is issued under the fixed designation D4370; 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 These test methods cover the determination of acid and base milliequivalent contents of anodic and cathodic electrocoat
baths and their ultrafiltrates.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
3. Summary of Test Methods
3.1 Specimens are titrated with standard acid and alkali solutions respectively. Alternative procedures are given for determining
acid and base concentrations potentiometrically or using a pH meter.
4. Significance and Use
4.1 The acid and base concentrations are a measurement of the titratable acidic and alkaline components in the electrocoat baths.
These measurements are used for research, production or electrocoat bath process control.
5. Apparatus
5.1 Automatic Potentiometric Titrator with Stirrer and Recorder, any model.
5.2 Analytical Balance, with sensitivity of 0.1 mg.
5.3 pH Meter, any model.
5.4 Glass and Saturated Calomel Electrodes.
5.5 Syringes, 5-mL disposable.
6. Reagents
6.1 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.
1
These test methods are under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and are the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved June 1, 2012Dec. 1, 2017. Published July 2012December 2017. Originally approved in 1984. Last previous edition approved in 20062012 as
D4370 – 01 (2006).(2012). DOI: 10.1520/D4370-01R12.10.1520/D4370-01R17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM 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.
3
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
1
---------------------- Page: 1 ----------------------
D4370 − 01 (2017)
Other grades may be used, provided it is ascertained that the reagent is of sufficiently high purity to permit its use without
lessening the accuracy of the determination.
6.2 Purity of Water—References to water shall be understood to mean water conforming to Type II of Specification D1193.
6.3 Potassium Hydroxide Solution in Methanol, 0.1 N—Prepare by dissolving 5.6 g of potassium hydroxide (KOH) pellets in
1 L of methanol. Standardize against NIST standard reference material of acid potassium phthalate No. 84 using an automatic
4
potentiometric titrator to a given end point or, alternatively, to a phenolphthalein end point.
6.4 Hydrochloric Acid Solution , 0.1 N—Prepare by mixing about 8.50 mL of concentrated
...
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