Fig. 5presents the concentrations of the four indicated VOCs
from the engineered flooring bonded with each resin system, as
determined by the VOC analyzer[19]. For each substance, the con-centrations were measured at 96h after the start of the test. Three
different phases are evident in the figure. In the first phase, the
concentration in the 3L polyester bag increased due to the con-stant emission of organic compounds and was limited by the given
air exchange rate. Xylene was the highest detected compound in
all samples, followed by ethylbenzene and toluene. Styrene, how-ever, was not detected at all in any of the systems. However,
TVOC emission of the PVAc-added CF resin system was slightly
increased compare to that of the CF resin. In Korea, the Ministry
of Environment provides TVOC guidelines for building materi-als. Even natural VOCs from wood are considered to be harmful
and are included in the TVOC calculation. TVOC was calculated
between C6and C16[19]. In the VOC analyzer test, however, we
defined TVOC as the sum of the four detected main aromatic
hydrocarbon gases: toluene, ethylbenzene, styrene and xylene