Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26785
Title: The effect of wet film thickness on VOC emissions from a finishing varnish
Authors: Lee, SC 
Kwok, NH
Guo, H
Hung, WT 
Keywords: Building materials
Environmental chamber
Modeling
Thickness
Varnish
Volatile organic compounds (VOCs)
Wet film
Issue Date: 2003
Publisher: Elsevier
Source: Science of the total environment, 2003, v. 302, no. 1-3, p. 75-84 How to cite?
Journal: Science of the total environment 
Abstract: Finishing varnishes, a typical type of oil-based varnishes, are widely used to shine metal, wood trim and cabinet surfaces in Hong Kong. The influence of wet film thickness on volatile organic compound (VOC) emissions from a finishing varnish was studied in an environmental test chamber. The varnish was applied on an aluminium foil with three different wet film thickness (35.2, 69.9 and 107.3 μm). The experimental conditions were 25.0 °C, 50.0% relative humidity (RH) with an air exchange rate of 0.5 h -1. The concentrations of the major VOCs were monitored for the first 10 h. The air samples were collected by canisters and analysed by gas chromatography/mass selective detector (GC/MSD). Six major VOCs including toluene, chlorobenzene, ethylbenzene, m,p-xylene, o-xylene and 1,3,5-trimethylbenzene were identified and quantified. Marked differences were observed for three different film thicknesses. VOC concentrations increased rapidly during the first few hours and then decreased as the emission rates declined. The thicker the wet film, the higher the VOC emissions. A model expression included an exponentially decreasing emission rate of varnish film. The concentration and time data measured in the chamber were used to determine the parameters of empirical emission rate model. The present work confirmed that the film thickness of varnish influenced markedly the concentrations and emissions of VOCs.
URI: http://hdl.handle.net/10397/26785
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/S0048-9697(02)00340-6
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