1) The document discusses hot abrasion testing of low cement castables containing silicon carbide (SiC) with and without antioxidants like boron carbide (B4C). 2) Adding B4C protected the SiC from oxidation at high temperatures, drastically reducing abrasion losses. Without B4C, abrasion losses increased significantly at temperatures over 900°C due to SiC oxidation. 3) The effect of grain size distribution on abrasion resistance of alumina-based low cement castables was also examined. Changing the grain size did not significantly affect abrasion losses, but high temperature testing resulted in around 30% lower losses.