The Bureau of Mines is investigating the acid resistance of ceramic materials to identify construction materials for emerging technology in chemical and metallurgical processes. Eight commercial ceramic materials were evaluated: two red shale, two fireclay, one silicon carbide, one silica, one carbon, and one high-alumina. Samples were exposed to 10 wt pct h2so4 at 50 deg c and 10, 30, 50, 70, and 90 wt pct h2so4 at 90 deg c for time periods of 110 days. Statistically significant changes in cold crushing strength were observed in the silicon carbide and carbon materials. Weight changes and the leach rate of al, ca, fe, k, mg, na, si, and ti were also monitored. The most severe corrosion conditions were at 90 deg c and 30 to 50 wt pct h2so4 for the acidproof and at 10 wt pct h2so4 for the acid- resistant materials. The silica and the high-alumina materials were the most acid-resistant, followed by the higher density red shale and fire clay. This report is based upon work done under an agreement between the University of Alabama and the Bureau of Mines.