A new ASTM guide standardizes a useful, fast and easy technique for collecting infrared spectra of non-aqueous liquid paints right out of the can.
ASTM D7588: Guide for FT-IR Fingerprinting of a Non-Aqueous Liquid Paint as Supplied in the Manufacturer’s Container was developed by Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials, which is part of Committee D01 on Paint and Related Coatings, Materials and Applications.
Less Time, Expertise Needed
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, quality control, troubleshooting and verifying that the paint being used is the same as the paint sample tested, ASTM notes.
|FTIR is used to produce a “fingerprint” spectrum of different chemical compounds within objects. ASTM’s new paint guide eliminates the need to separate components in sampling.|
Historically, fingerprinting a material for this purpose involved separating the paint components (such as vehicle, pigments or solvent) and collecting an infrared spectrum of one or more components, using Test Method D2621 to identify 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,” ASTM reports. “In addition, user expertise and time required to collect a spectrum is minimal versus traditional standards.”
No Component Separation
“The most practical application of ASTM D7588 is its ability to be used to collect good-quality reproducible spectra of liquid paint samples straight out of the can without the need for time-consuming separation of components,” say Steve Liebhart and John Kloepper of Carboline Co., members of ASTM Committees D01 and D33 on Protective Coating and Lining Work for Power Generation Facilities.
The new standard should be useful for quality control, formula control, process control, failure analysis, chemical identification, compositional comparisons, and raw material comparisons, Liebhart and Kloepper say.
The standard should significantly decrease the amount of time, training and expertise required to consistently reproduce good quality infrared spectra between organizations, laboratories and individuals.
Expected users of ASTM D7588 include coating manufacturers and engineers, quality control personnel, transportation departments and testing and analytical laboratories.
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