Record Display for the EPA National Library Catalog

RECORD NUMBER: 22 OF 26

OLS Field Name OLS Field Data
Main Title Removal of CaCO3 Extender in Residential Coatings by Atmospheric Acidic Deposition.
Author Miller, W. C. ; Fornes, R. E. ; Gilbert, R. D. ; Speer, A. ; Spence, J. ;
CORP Author North Carolina State Univ. at Raleigh.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher 1992
Year Published 1992
Report Number EPA-R-814121; EPA/600/A-92/243;
Stock Number PB93-120996
Additional Subjects Air pollution effects(Materials) ; Calcium carbonates ; Paints ; Physical radiation effects ; Ultraviolet radiation ; Sampling ; Exposure ; Materials tests ; Test chambers ; Optical microscopy ; Environmental effects ; Scanning electron microscopy ; X ray diffraction ; Crystals ; Surface properties ; Energy dispersive spectroscopy
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB93-120996 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/08/1993
Collation 8p
Abstract
The removal and fate of CaCO3 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. X-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. Crystals of various forms of calcium sulfate formed on paint surfaces. Surprisingly, migration of calcium to the paint surface occurred in the absence of liquid water in the form of dew.