ASTM D6979-24
(Test Method)Standard Test Method for Polyurethane Raw Materials: Determination of Basicity in Polyols, Expressed as Percent Nitrogen
Standard Test Method for Polyurethane Raw Materials: Determination of Basicity in Polyols, Expressed as Percent Nitrogen
SIGNIFICANCE AND USE
5.1 This test method is suitable for quality control, as a specification test, and for research. The results are measures of batch-to-batch uniformity and are useful in estimating reactivity.
5.1.1 The percent nitrogen can be used to characterize a polyol or indicate amounts of certain components in a polyol blend.
5.1.2 It is permissible to also express the results in equivalents of base per gram of sample, if desired.
SCOPE
1.1 This test method measures the basic constituents in polyols that are soluble in glacial acetic acid and reactive with perchloric acid. Samples containing 0.3 % to 10 % nitrogen have been evaluated by this method. This test method is applicable to polyether polyols and polyether polyol blends that are used in urethane reactions. (See Note 1.)
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.
Note 1: This standard is equivalent to ISO 25761:08.
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.
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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: D6979 − 24
Standard Test Method for
Polyurethane Raw Materials: Determination of Basicity in
1
Polyols, Expressed as Percent Nitrogen
This standard is issued under the fixed designation D6979; 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* E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method measures the basic constituents in
E2935 Practice for Evaluating Equivalence of Two Testing
polyols that are soluble in glacial acetic acid and reactive with
Processes
perchloric acid. Samples containing 0.3 % to 10 % nitrogen
4
have been evaluated by this method. This test method is 2.2 ISO Standards:
applicable to polyether polyols and polyether polyol blends ISO 25761 Plastics—Polyols for use in the production of
that are used in urethane reactions. (See Note 1.) polyurethanes—Determination of basicity (total amine
value), expressed as percent nitrogen
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
3. Terminology
standard.
3.1 Definitions—Terms used in this standard are defined in
1.3 This standard does not purport to address all of the
accordance with Terminology D883, unless otherwise speci-
safety concerns, if any, associated with its use. It is the
fied. For terms relating to precision and bias and associated
responsibility of the user of this standard to establish appro-
issues, the terms used in this standard are defined in accordance
priate safety, health, and environmental practices and deter-
with Terminology E456.
mine the applicability of regulatory limitations prior to use.
3.2 Definitions of Terms Specific to This Standard:
NOTE 1—This standard is equivalent to ISO 25761:08.
3.2.1 percent nitrogen, n—the quantity of perchloric acid-
1.4 This international standard was developed in accor-
titratable base, expressed as a weight percentage of nitrogen in
dance with internationally recognized principles on standard-
a sample.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4. Summary of Test Method
mendations issued by the World Trade Organization Technical
4.1 The sample is dissolved in glacial acetic acid. The
Barriers to Trade (TBT) Committee.
resulting single-phase solution is titrated at room temperature
2. Referenced Documents
to a potentiometric end point with a standardized solution of
2
perchloric acid in acetic acid. Results are reported as percent
2.1 ASTM Standards:
nitrogen.
D883 Terminology Relating to Plastics
E180 Practice for Determining the Precision of ASTM
5. Significance and Use
Methods for Analysis and Testing of Industrial and Spe-
3
cialty Chemicals (Withdrawn 2009)
5.1 This test method is suitable for quality control, as a
E456 Terminology Relating to Quality and Statistics
specification test, and for research. The results are measures of
batch-to-batch uniformity and are useful in estimating reactiv-
ity.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics
5.1.1 The percent nitrogen can be used to characterize a
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials -
polyol or indicate amounts of certain components in a polyol
Plastics and Elastomers.
Current edition approved Feb. 1, 2024. Published February 2024. Originally
blend.
approved in 2003. Last previous edition approved in 2018 as D6979 – 18. DOI:
5.1.2 It is permissible to also express the results in equiva-
10.1520/D6979-24.
2 lents of base per gram of sample, if desired.
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 4
The last approved version of this historical standard is referenced on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
www.astm.org. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6979 − 24
TABLE 1 Round-Robin Percent Nitrogen Data in Accordance with
6. Apparatus
A
Practice E180
6.1 Potentiometric Automatic Ti
...
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: D6979 − 18 D6979 − 24
Standard Test Method for
Polyurethane Raw Materials: Determination of Basicity in
1
Polyols, Expressed as Percent Nitrogen
This standard is issued under the fixed designation D6979; 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 measures the basic constituents in polyols that are soluble in glacial acetic acid and reactive with perchloric
acid. Samples containing 0.3 –0.3 % to 10 % nitrogen have been evaluated by this method. This test method is applicable to
polyether polyols and polyether polyol blends that are used in urethane reactions. (See Note 1.)
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.
NOTE 1—This standard is equivalent to ISO 25761:08.
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:
D883 Terminology Relating to Plastics
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
3
(Withdrawn 2009)
E456 Terminology Relating to Quality and Statistics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E2935 Practice for Evaluating Equivalence of Two Testing Processes
4
2.2 ISO Standards:
ISO 25761 Plastics—Polyols for use in the production of polyurethanes—Determination of basicity (total amine value),
expressed as percent nitrogen
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.22 on Cellular Materials - Plastics
and Elastomers.
Current edition approved Aug. 1, 2018Feb. 1, 2024. Published August 2018February 2024. Originally approved in 2003. Last previous edition approved in 20132018 as
D6979 - 13.D6979 – 18. DOI: 10.1520/D6979-18.10.1520/D6979-24.
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
The last approved version of this historical standard is referenced on www.astm.org.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6979 − 24
3. Terminology
3.1 Definitions—For definitions of terms Terms used in this test method see standard are defined in accordance with Terminology
D883, unless otherwise specified. For terms relating to precision and bias and associated issues, the terms used in this standard
are defined in accordance with Terminology E456.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 percent nitrogen—nitrogen, n—the quantity of perchloric acid-titratable base, expressed as a weight percentage of nitrogen
in a sample.
4. Summary of Test Method
4.1 The sample is dissolved in glacial acetic acid. The resulting single-phase solution is titrated at room temperature to a
potentiometric end point with a standardized solution of perchloric acid in acetic acid. Results are reported as percent nitrogen.
5. Significance and Use
5.1 This test method is suitable for quality control, as a specification test, and for research. The results are measures of
batch-to-batch uniformity and are useful in estimating reactivity.
5.1.1 The percent nitrogen can be used to characterize a polyol or indicate amounts of certain components in a polyol blend.
5.1.2
...
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