ASTM D2621-87(2005)

Standard Test Method for Infrared Identification of Vehicle Solids From Solvent-Reducible Paints

SIGNIFICANCE AND USE
The ability to qualitatively identify paint vehicles is useful for characterizing unknown or competitive coatings, for complaint investigations, and for in-process control.
SCOPE
1.1 This test method covers the qualitative characterization or identification of separated paint vehicle solids by infrared spectroscopy within the limitations of infrared spectroscopy.
1.2 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.

General Information

• Status: Historical
• Publication Date: 30-Jun-2005
• ICS: 87.060.20 - Binders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaces: ASTM D2621-87(2000) - Standard Test Method for Infrared Identification of Vehicle Solids From Solvent-Reducible Paints
• Effective Date: 01-Jul-2005
• Replaced By: ASTM D2621-87(2011) - Standard Test Method for Infrared Identification of Vehicle Solids From Solvent-Reducible Paints
• Effective Date: 01-Jun-2011
• Referred By: ASTM D7588-11(2018) - Standard Guide for FT-IR Fingerprinting of a Non-Aqueous Liquid Paint as Supplied in the Manufacturer's Container
• Effective Date: 01-Jul-2005
• Referred By: ASTM F940-99(2019)e1 - Standard Practice for Quality Control Receipt Inspection Procedures for Protective Coatings (Paint), Used in Marine Construction and Shipbuilding
• Effective Date: 01-Jul-2005
• Referred By: ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
• Effective Date: 01-Jul-2005
• Referred By: ASTM D6763-16(2022) - Standard Guide for Testing Exterior Wood Stains and Clear Water Repellents
• Effective Date: 01-Jul-2005
• Referred By: ASTM D5146-10(2019) - Standard Guide to Testing Solvent-Borne Architectural Coatings
• Effective Date: 01-Jul-2005
• Referred By: ASTM D3168-85(2022) - Standard Practice for Qualitative Identification of Polymers in Emulsion Paints
• Effective Date: 01-Jul-2005

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D2621 – 87 (Reapproved 2005)
Standard Test Method for
Infrared Identification of Vehicle Solids From Solvent-
1
Reducible Paints
This standard is issued under the fixed designation D2621; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Significance and Use
1.1 This test method covers the qualitative characterization 5.1 The ability to qualitatively identify paint vehicles is
or identification of separated paint vehicle solids by infrared useful for characterizing unknown or competitive coatings, for
spectroscopy within the limitations of infrared spectroscopy. complaint investigations, and for in-process control.
1.2 This standard does not purport to address all of the
6. Apparatus
safety concerns, if any, associated with its use. It is the
6.1 Spectrophotometer—A recording double-beam infrared
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- spectrophotometerwithawavelengthrangefromatleast2.5to
15 µ m and a spectral resolution of at least 0.04 µm over that
bility of regulatory limitations prior to use.
range. See Practice E275.
2. Referenced Documents
6.2 Demountable Cell Mount, with NaCl window.
2
2.1 ASTM Standards: 6.3 Vacuum Drying Oven thermostatically controlled to
D1467 Guide for Testing Fatty Acids Used in Protective operate at 60 6 2°C. A water aspirator vacuum source is
3
Coatings satisfactory.
D1962 Test Method for Saponification Value of Drying 6.4 Oven, Gravity or Forced Draft, capable of maintaining
3
Oils, Fatty Acids, and Polymerized Fatty Acids temperature from 105 to 110°C.
D2372 Practice for Separation of Vehicle From Solvent-
7. Procedure
Reducible Paints
E131 Terminology Relating to Molecular Spectroscopy 7.1 Placethevehicle,separatedfromthepaintinaccordance
E275 Practice for Describing and Measuring Performance with Practice D2372, on a NaCl window and spread to form a
uniform film. Make sure that the thickness of the film is such
of Ultraviolet and Visible Spectrophotometers
that when the infrared spectrum is recorded, the transmittance
3. Terminology
of the strongest band falls between 5 and 15% (Note). Dry the
3.1 Definitions: film in an oven at 105 to 110°C for 15 min and cool in a
3.1.1 For definitions of terms and symbols, refer to Termi- desiccator.Inspectthefilmvisuallyfordefectssuchasbubbles,
nology E131. wrinkles, contamination, etc. If defects are present, cast an-
other film. If easily oxidizable substances are present such as
4. Summary of Test Method
tung,oiticica,orlinseedoils,makesurethatthefilmisdriedat
4.1 Infraredspectraarepreparedfromdriedfilmsofisolated 60 62°Cinavacuumovenfor1h.Ifsolventsoflowvolatility
paint vehicles. Vehicle types are identified by comparing the
such as cyclohexanone or isophorone are present, the film may
spectra to a collection of reference infrared spectra. need to be dried for several hours in a 60°C vacuum oven.
NOTE 1—Numerous procedures and variations may be used to obtain a
1
film on which to prepare a suitable spectrum. These include liquid
This test method is under the jurisdiction of ASTM Committee D01 on Paint
mounting between two NaCl plates, transmission through free films, and
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. reflectance from highly polished surfaces.
Current edition approved July 1, 2005. Published August 2005. Originally
7.2 Immediatelyrecordtheinfraredspectrumfrom2.5to15
approved in 1967. Last previous edition approved in 2000 as D2621–87(2000).
µm so that a spectral resolution of 0.04 µm is maintained
DOI: 10.1520/D2621-87R05.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
throughout that range (methods for achieving this resolution
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
willvaryaccordingtothedirectionsofthemanufacturerofthe
Standards volume information, refer to the standard’s Document Summary page on
instrument used).
the ASTM website.
3
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
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D2621 – 87 (2005)
TABLE 1 Correlation of Absorption Bands in Alkyd Spectra
−1
Wavelength, µm Wavenumbers, cm Group Vibration
2.9 3448 O–H stretch
3.4 to 3.5 2941 to 2857 alkane C–H stretch
5.8 1724 ester, C=O stretch
6.2, 6.3, 6.6, 6.7 1613, 1587, 151
...