ASTM D4660-18

Standard Test Methods for Polyurethane Raw Materials: Determination of the Isomer Content of Toluenediisocyanate

SIGNIFICANCE AND USE
5.1 These test methods are suitable for research or for quality control to determine the isomer content of toluene diisocyanates.  
5.2 The isomer content of a toluene diisocyanate relates to its reactivity.
SCOPE
1.1 These test methods measure the amount of toluene-2,6-diisocyanate (2,6-TDI) isomer or toluene–2,4–diisocyanate (2,4-TDI) isomer in mixtures of the 2,4- and 2,6-isomers of toluenediisocyanate (TDI). Two different test methods are provided to give accurate results over the broad range of isomer concentrations possible.  
1.1.1 Test Method A—Applicable to TDI samples containing 5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer).  
1.1.2 Test Method B—Applicable to TDI samples containing 0 to 5 % of 2,6-TDI isomer (95 to 100 % 2,4-TDI isomer).  
Note 1: These test methods are equivalent to ISO 15064.  
1.2 The values stated in SI units are to be regarded as 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

• Status: Historical
• Publication Date: 31-Mar-2018
• ICS: 83.040.30 - Auxiliary materials and additives for plastics
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D4660 − 18
Standard Test Methods for
Polyurethane Raw Materials: Determination of the Isomer
1
Content of Toluenediisocyanate
This standard is issued under the fixed designation D4660; 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.
3
1. Scope* cialty Chemicals (Withdrawn 2009)
4
2.2 ISO Standard:
1.1 These test methods measure the amount of toluene-2,6-
diisocyanate (2,6-TDI) isomer or toluene–2,4–diisocyanate ISO 15064 Plastics—Aromatic Isocyanates for Use in the
Production of Polyurethanes—Determination of the Iso-
(2,4-TDI) isomer in mixtures of the 2,4- and 2,6-isomers of
toluenediisocyanate (TDI). Two different test methods are mer Ratio in Toluenediisocyanate
provided to give accurate results over the broad range of
isomer concentrations possible. 3. Terminology
1.1.1 Test Method A—Applicable to TDI samples containing
3.1 Terminology in these test methods is in accordance with
5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer).
Terminology D883.
1.1.2 Test Method B—Applicable to TDI samples containing
3.2 Definitions of Terms Specific to This Standard:
0 to 5 % of 2,6-TDI isomer (95 to 100 % 2,4-TDI isomer).
3.2.1 isomer—a compound having the same molecular for-
NOTE 1—These test methods are equivalent to ISO 15064.
mula (percentage composition and molecular weight) as an-
other compound but differs in chemical or physical properties.
1.2 The values stated in SI units are to be regarded as
3.2.2 isomer content—the amount of an isomer expressed as
standard.
a percentage of total 2,4 and 2,6-TDI isomer amount.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Methods
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- 4.1 Both test methods are based on the quantitative mea-
mine the applicability of regulatory limitations prior to use. surement of absorption bands arising from out-of-plane C-H
1.4 This international standard was developed in accor-
deformation vibrations of the aromatic ring.
dance with internationally recognized principles on standard-
4.2 In Test Method A, the infrared spectrum of a cyclo-
ization established in the Decision on Principles for the
hexane solution of the sample is recorded in the 770 to
Development of International Standards, Guides and Recom- −1 −1
840-cm region. The absorbance ratio of the 805 cm to the
mendations issued by the World Trade Organization Technical –1
782 cm band is measured and converted to percent 2,6-TDI,
Barriers to Trade (TBT) Committee.
or percent 2,4-TDI, or both, from a previously established
calibration curve.
2. Referenced Documents
−1
4.3 In Test Method B, the absorbance of the 782-cm band
2
2.1 ASTM Standards:
is measured from an infrared spectrum of an undiluted sample
D883 Terminology Relating to Plastics
and then converted to percent 2,6-TDI from a previously
E180 Practice for Determining the Precision of ASTM
established calibration curve.
Methods for Analysis and Testing of Industrial and Spe-
5. Significance and Use
5.1 These test methods are suitable for research or for
1
These test methods are under the jurisdiction of ASTM Committee D20 on
quality control to determine the isomer content of toluene
Plastics and are the direct responsibility of Subcommittee D20.22 on Cellular
diisocyanates.
Materials - Plastics and Elastomers.
Current edition approved April 1, 2018. Published April 2018. Originally
approved in 1959. Last previous edition approved in 2012 as D4660 - 12. DOI:
10.1520/D4660-18.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.astm.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 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 ----------------------
D4660 − 18
5.2 The isomer content of a toluene diisocyanate relates to 8. Sampling
its reactivity.
8.1 Since organic isocyanates react with atmospheric
moisture, take special precautions in sampling. Usual sampling
6. Apparatus
methods, even when conducted rapidly, can ca
...

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: D4660 − 12 D4660 − 18
Standard Test Methods for
Polyurethane Raw Materials: Determination of the Isomer
1
Content of Toluenediisocyanate
This standard is issued under the fixed designation D4660; 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 measure the amount of toluene-2,6-diisocyanate (2,6-TDI) isomer or toluene–2,4–diisocyanate
(2,4-TDI) isomer in mixtures of the 2,4- and 2,6-isomers of toluenediisocyanate (TDI). Two different test methods are provided
to give accurate results over the broad range of isomer concentrations possible.
1.1.1 Test Method A—Applicable to TDI samples containing 5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer).
1.1.2 Test Method B—Applicable to TDI samples containing 0 to 5 % of 2,6-TDI isomer (95 to 100 % 2,4-TDI isomer).
NOTE 1—These test methods are equivalent to ISO 15064.
1.2 The values stated in SI units are to be regarded as 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:
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)
4
2.2 ISO Standard:
ISO 15064 Plastics—Aromatic Isocyanates for Use in the Production of Polyurethanes—Determination of the Isomer Ratio in
Toluenediisocyanate
3. Terminology
3.1 Terminology in these test methods is in accordance with Terminology D883.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 isomer—a compound having the same molecular formula (percentage composition and molecular weight) as another
compound but differs in chemical or physical properties.
3.2.2 isomer content—the amount of an isomer expressed as a percentage of total 2,4 and 2,6-TDI isomer amount.
4. Summary of Test Methods
4.1 Both test methods are based on the quantitative measurement of absorption bands arising from out-of-plane C-H
deformation vibrations of the aromatic ring.
1
These test methods are under the jurisdiction of ASTM Committee D20 on Plastics and are the direct responsibility of Subcommittee D20.22 on Cellular Materials -
Plastics and Elastomers.
Current edition approved May 1, 2012April 1, 2018. Published June 2012April 2018. Originally approved in 1959. Last previous edition approved in 20062012 as
D4660 - 06.D4660 - 12. DOI: 10.1520/D4660-12.10.1520/D4660-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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 ----------------------
D4660 − 18
−1
4.2 In Test Method A, the infrared spectrum of a cyclohexane solution of the sample is recorded in the 770 to 840-cm region.
−1 –1
The absorbance ratio of the 805 cm to the 782 cm band is measured and converted to percent 2,6-TDI, or percent 2,4-TDI,
or both, from a previously established calibration curve.
−1
4.3 In Test Method B, the absorbance of the 782-cm band is measured from an infrared spectrum of an undiluted sample and
then converted to percent 2,6-TDI from a previously established calibration curve.
5. Significance and Use
5.1 These test methods can be used are suitable for research or
...