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ASTM D1652-04

(Test Method)

Standard Test Method for Epoxy Content of Epoxy Resins

Standard Test Method for Epoxy Content of Epoxy Resins

SIGNIFICANCE AND USE
The epoxy content of epoxy resins is an important variable in determining their reactivity and the properties of coatings made from them. These test methods may be used to determine the epoxy content of manufactured epoxy resins and confirm the stated epoxy content of purchased epoxy resins.
SCOPE
1.1 This test method covers the procedure for manual and automatic titration of epoxy resins for the quantitative determination of the percent epoxide content from 0.1 - 26 % epoxide.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section .

General Information

Status
Historical
Publication Date
31-Oct-2004
ICS
83.080.10 - Thermosetting materials
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.33 - Polymers and Resins
Current Stage
Ref Project

Relations

Replaces
ASTM D1652-97 - Standard Test Methods for Epoxy Content of Epoxy Resins
Effective Date
01-Nov-2004
Replaced By
ASTM D1652-11 - Standard Test Method for Epoxy Content of Epoxy Resins
Effective Date
01-Nov-2011
Referred By
ASTM D4142-89(2022) - Standard Guide for Testing Epoxy Resins
Effective Date
01-Nov-2004
Referred By
ASTM D1763-00(2021) - Standard Specification for Epoxy Resins
Effective Date
01-Nov-2004

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ASTM D1652-04 - Standard Test Method for Epoxy Content of Epoxy Resins
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D1652–04
Standard Test Method for
1
Epoxy Content of Epoxy Resins
This standard is issued under the fixed designation D1652; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* situ by the addition of perchloric acid to the quaternary
ammonium halide rapidly opens the oxirane ring.
1.1 This test method covers the procedure for manual and
3.1.2 In the Automatic Titration Method, the reaction is
automatic titration of epoxy resins for the quantitative deter-
measuring the millivolt (MV) potential as perchloric acid is
mination of the percent epoxide content from 0.1 – 26 %
added, which combines with the bromide to form the hydro-
epoxide.
bromic acid, which reacts with the epoxide group. As the
1.2 The values stated in SI units are to be regarded as the
reaction progresses, the potential will gradually increase until
standard. The values given in parentheses are for information
the reaction nears completion at which point the potential
only.
increases very quickly. The titrator measures the rate of the
1.3 This standard does not purport to address all of the
reaction by calculating the change in potential between per-
safety concerns, if any, associated with its use. It is the
chloric acid addition increments. When the change in potential
responsibility of the user of this standard to establish appro-
begins to decrease, the titrator determines that the titration is
priate safety and health practices and determine the applica-
complete. The epoxide content is calculated using the reagent
bility of regulatory limitations prior to use. For specific hazard
factor entered by the user during standardization, the weight of
statements, see Section 6.
the sample, and the volume of perchloric acid added during
2. Referenced Documents titration.
2
2.1 ASTM Standards:
4. Significance and Use
D1193 Specification for Reagent Water
4.1 The epoxy content of epoxy resins is an important
2.2 Other Documents:
variable in determining their reactivity and the properties of
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
3
coatings made from them. These test methods may be used to
1910.1200
determine the epoxy content of manufactured epoxy resins and
3. Summary of Test Method
confirm the stated epoxy content of purchased epoxy resins.
3.1 The resin is dissolved in a suitable solvent and the
5. Reagents
resulting solution is titrated with hydrogen bromide either
5.1 Purity of Reagents—Reagent grade chemicals shall be
directly or in situ. The hydrogen bromide reacts stoichiometri-
used in all tests. Unless otherwise indicated, it is intended that
cally with epoxy groups to form bromohydrins; therefore, the
all reagents shall conform to the specifications of the Commit-
quantity of acid consumed is a measure of the epoxy content.
tee onAnalytical Reagents of theAmerican Chemical Society,
3.1.1 In the Manual Titration Method, the titration is with
4
where such specifications are available. Other grades may be
standard perchloric acid in the presence of an excess of
used, provided it is first ascertained that the reagent is of
tetraethylammonium bromide. Hydrogen bromide generated in
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
5.2 Purity of Water—Unless otherwise indicated, references
and Related Coatings, Materials, andApplications and is the direct responsibility of
to water shall be understood to mean reagent water as defined
Subcommittee D01.33 on Polymers and Resins.
by Type II of Specification D1193.
Current edition approved November 1, 2004. Published December 2004.
Originallyapprovedin1969.Lastpreviouseditionapprovedin1997asD1652 – 97.
DOI: 10.1520/D1652-04.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Reagent Chemicals, American Chemical Society Specifications, American
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Standards volume information, refer to the standard’s Document Summary page on listed by the American Chemical Society, see Analar Standards for Laboratory
the ASTM website. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
3
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments, and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC
...

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