The following features appear in the February 2014 issue of CoatingsTech:
American Coatings Conference Preview
New Direct-to-Metal Coatings Developed for Aerospace and Military Applications
Cynthia Challener, CoatingsTech Contributing Writer
As with most coating end-users, customers in the aerospace and military sectors look for ways to lower cost and increase the ease of applicability of coating technologies while maintaining the desired level of performance. Direct-to-metal (DTM), or self-priming, coatings have provided such benefits when used in light- to medium-duty general applications. However, there have been significant challenges with their use in the more demanding aerospace and military applications. Here, CoatingsTech details the advantages that can be gained with the use of DTM coatings, such as increased coating application efficiency, lower costs, reduced labor demand, and lower energy use. Such benefits are examined in the context of the recent advances in DTM technologies and the challenges that still remain.
GC Headspace Applications for VOC:The Challenges of Obtaining Accurate Measurements with Decreasing VOC Levels
Jeremy Powers, Dr. Brij Mohal, and Selby Brannon,Chromaflo Technologies
Currently, there are several methods used to measure volatile organic compounds (VOC) in colorants, including EPA 24, ISO 11890-2, ISO 17895, and ASTM D6886. Despite the interlaboratory precision that these methods may exhibit, they are frequently inaccurate due to a dependency upon the chemistry of the coatings samples investigated. Nevertheless, numerous governing bodies—domestic and worldwide—attempt to regulate the amount of VOC in coatings dispersions without the presence of a truly accurate method. The global trend toward lower VOC in coatings markets and the liability therein are leading scientists to evaluate several methods for gas chromatography to accurately determine the VOC of coatings dispersions. Unfortunately, current methods for VOC analysis are dependent upon the sample, solvent, concentration, and GC column—and each of these can contribute to inaccuracies.The focus of this article is to demonstrate that gas chromatography mass spectroscopy headspace (GC-MS HS) analysis is preferable after quantitative screening methods have been applied. Verification methods for VOC results are reviewed and the degree of probable success evaluated.
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