This study examined blends of styrene butadiene rubber(SBR) and chloroprene rubber(CR) prepared from an open 2-roll mill following the conventional polymer blend method for a wide range of the blend composition. Rubber vulcanizates were manufactured by hot press and then mechanical properties, heat and ozone resistance of the specimens were examined. Due to the post cure during the aging test, hardness of vulcanizates was increased. It was found that the undesirable characteristics of heat and ozone resistance of pure SBR was significantly improved through the blending of SBR with CR.

The concentrations of SO_2 and SO_3 were measured to estimate a new developed long time exposure SO_2 sampler at Onsan industrial area considering the meteorological factors from June to October, 1992. The mean concentration of SO_3 by PbO_2 method was 0.924 ㎎ S0_3/100㎠ PbO_2/day and their high values were shown in the center of the industrial area, which show potential pollution due to the increase of industrial activities and micrometeorological factors in and around the sites. As a result of statistical correlation between SO_2 concentration by new sampling method and SO_3 concentration by PbO_2 method in July and August, 1992, correlation coefficients were high (r=0.87, 0.91) and shown more than 0.83 value in the high concentration data set, which was arbitrarily divided into 7-10㎕ SO_2 concentration in an attempt to further investigate these relationships. Therefore, use of new developed long time exposure SO_2 sampler is good for SO_2 measurement and valuable for estimation of air quality in the urban and industrial area.