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Significance and Use
The ability to collect an infrared spectrum of a liquid paint as supplied in the container from the manufacturer is of significant importance when performing qualification testing. Historically, fingerprinting a material for such purpose involved separating the components of the paint and collecting an infrared spectrum of one or more of these components (vehicle, pigments, solvent, etc.) with Test Method D2621 being used for the identification of the vehicle. This unfortunately provides information only on the portion of the liquid paint analyzed whereas the technique shown in this practice provides a more complete picture of what is in the container provided. In addition, user expertise and time required to collect a spectrum is minimal versus traditional standards.
1.1 This guide covers the FT-IR fingerprinting of a liquid paint as supplied in the container without the need to separate components. Spectra collected using this technique have been found useful for paint manufacturers' quality control, trouble shooting and to verify that the paint being used is the same as the paint sample tested. This technique has been found useful for both single and multi-component coatings, the latter of which, where each component is analyzed separately (for example, amine cured epoxies and polyol/isocyanate urethanes).
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 and health practices and determine the applicability of regulatory requirements prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D2621 Test Method for Infrared Identification of Vehicle Solids From Solvent-Reducible Paints
E131 Terminology Relating to Molecular Spectroscopy
E168 Practices for General Techniques of Infrared Quantitative Analysis
E204 Practices for Identification of Material by Infrared Absorption Spectroscopy, Using the ASTM Coded Band and Chemical Classification Index
ICS Number Code 87.040 (Paints and varnishes)
UNSPSC Code 31211500(Paints and primers)