ASTM D6979-18

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 − 13 D6979 − 18
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 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 – 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
NOTE 1—This standard is equivalent to ISO 25761:08ISO 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(Withdrawn 2009)
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
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
3. Terminology
3.1 Definitions—For definitions of terms used in this test method see Terminology D883.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 percent nitrogen—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.
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 Nov. 1, 2013Aug. 1, 2018. Published November 2013August 2018. Originally approved in 2003. Last previous edition approved in 20082013
as D6979 - 08.D6979 - 13. DOI: 10.1520/D6979-13.10.1520/D6979-18.
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

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D6979 − 18
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.
6. Apparatus
6.1 Potentiometric Automatic Titrator
6.2 Autotitrator Buret with Dosing Device, 20-mL
6.3 pH Glass Electrode and Reference Electrode or a Combination Glass Electrode
6.4 Analytical Balances, capable of weighi
...

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: D6979 − 18
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
4
2.2 ISO Standards:
polyols that are soluble in glacial acetic acid and reactive with
ISO 25761 Plastics—Polyols for use in the production of
perchloric acid. Samples containing 0.3 – 10 % nitrogen have
polyurethanes—Determination of basicity (total amine
been evaluated by this method. This test method is applicable
value), expressed as percent nitrogen
to polyether polyols and polyether polyol blends that are used
in urethane reactions. (See Note 1.)
3. Terminology
1.2 The values stated in SI units are to be regarded as
3.1 Definitions—For definitions of terms used in this test
standard. No other units of measurement are included in this
method see Terminology D883.
standard.
3.2 Definitions of Terms Specific to This Standard:
1.3 This standard does not purport to address all of the
3.2.1 percent nitrogen—the quantity of perchloric acid-
safety concerns, if any, associated with its use. It is the
titratable base, expressed as a weight percentage of nitrogen in
responsibility of the user of this standard to establish appro-
a sample.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Summary of Test Method
NOTE 1—This standard is equivalent to ISO 25761:08.
4.1 The sample is dissolved in glacial acetic acid. The
1.4 This international standard was developed in accor-
resulting single-phase solution is titrated at room temperature
dance with internationally recognized principles on standard- to a potentiometric end point with a standardized solution of
ization established in the Decision on Principles for the
perchloric acid in acetic acid. Results are reported as percent
Development of International Standards, Guides and Recom-
nitrogen.
mendations issued by the World Trade Organization Technical
5. Significance and Use
Barriers to Trade (TBT) Committee.
5.1 This test method is suitable for quality control, as a
2. Referenced Documents
specification test, and for research. The results are measures of
2
batch-to-batch uniformity and are useful in estimating reactiv-
2.1 ASTM Standards:
ity.
D883 Terminology Relating to Plastics
5.1.1 The percent nitrogen can be used to characterize a
E180 Practice for Determining the Precision of ASTM
polyol or indicate amounts of certain components in a polyol
Methods for Analysis and Testing of Industrial and Spe-
3
blend.
cialty Chemicals (Withdrawn 2009)
5.1.2 It is permissible to also express the results in equiva-
lents of base per gram of sample, if desired.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics
6. Apparatus
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials -
Plastics and Elastomers. 6.1 Potentiometric Automatic Titrator
Current edition approved Aug. 1, 2018. Published August 2018. Originally
6.2 Autotitrator Buret with Dosing Device, 20-mL
approved in 2003. Last previous edition approved in 2013 as D6979 - 13. DOI:
10.1520/D6979-18.
6.3 pH Glass Electrode and Reference Electrode or a
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Combination Glass Electrode
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 − 18
TABLE 1 Round-Robin Percent Nitrogen Data in Accordance with
6.4 Analytical Balances, capable of weighing to the nearest
A
Practice E180
0.01g and 0.0001 g
B C D E F
Material Average S S r R df
r R
6.5 Magnetic Stirrer/Hotplate
A 0.317 0.0007 0.0018 0.0020 0.0050 5
B 2.51 0.0046 0.0053 0.0129 0.0148 5
C 5.86 0.0079 0.0139 0.0221 0.0392 5
7. Reagents and Materials
D 9.45 0.0220 0.0217 0.0616 0.
...