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REMOVAL OF CACO3 EXTENDER IN RESIDENTIAL COATINGS BY ATMOSPHERIC ACIDIC DEPOSITION
Citation:
Miller, W., R. Fornes, R. Gilbert, A. Speer, AND J. Spence. REMOVAL OF CACO3 EXTENDER IN RESIDENTIAL COATINGS BY ATMOSPHERIC ACIDIC DEPOSITION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/243 (NTIS PB93120996).
Description:
The removal and fate of CaC03 extender in latex and alkyd paints upon exposure of paint films to UV and atmospheric pollutants generated in a large environmental chamber were studied using optical and scanning electron microscopy in combination with energy dispersive spectroscopy. -ray mapping of film cross sections was used to examine migration of calcium to the film surface, and x-ray diffraction and Energy Dispersive Spectroscopy (EDS) were employed to determine crystalline nature of surface deposits. rystals of various forms of calcium sulfate formed on paint surfaces. urprisingly, migration of calcium to the paint surface occurred in the absence of liquid water in the form of dew.
