Material: Cordierite, Mullite, Corundum, Alumina. Application: RTO, HTAC, RCO, VOC and SCR. Hole: 25x25, 40x40, 43x43, 50x50. Honeycomb Ceramic for RTO, RCO, HTAC and SCR A regenerative thermal oxidizer ... 70.9 72.2 71.3 72.8 69.7 Honeycomb ceramic monolith for RTO/RCO/VOC