Abstract
Organic vapor respirator cartridges have been evaluated for use with Imron® and Centari®, two isocyanate containing enamels, under conditions which approximate field conditions. Although solvent breakthrough was observed under some conditions, isocyanate breakthrough was not observed in any test. During four hour exposures to Imron, neither solvent nor isocyanate breakthrough was observed with the Willson Products R21 organic vapor cartridge with R15 prefilter. On exposure of this cartridge to Centari, acetone breakthrough, followed by other solvents, was observed after 10 hours, but, even after 25 hours, isocyanate breakthrough was not observed. Ethyl acetate broke through the Mine Safety Appliances organic vapor cartridge (part number 459315) and prefilter (part number 448842) after 15 hours, but isocyanate had not broken through even after 18 hours of exposure.
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