SELEXSORB AS 1/8 is a spherical adsorbent designed for removal of trace contaminants like arsine, phosphine and stibine from process streams as propylene purification units. As a smooth alumina-based adsorbent impregnated with promoter, SELEXSORB AS 1/8 provides optimum adsorption capacity for these contaminants. It effectively removes them to levels below 5 ppbw.