Cordierite is valued for low thermal expansion, while cordierite-mullite formulations can provide a different balance of thermal stability and strength. Select the material from actual RTO temperature cycling and mechanical requirements rather than from material name alone.

Honeycomb ceramic open frontal area is different from specific surface area. Lower open area increases channel velocity and usually raises pressure drop, while deposits further reduce effective flow area during operation.

Thinner honeycomb ceramic walls increase open area and can reduce pressure drop, while thicker walls increase ceramic mass and mechanical robustness. Wall thickness should be evaluated together with CPSI, block density, thermal duty and handling requirements.

Smaller honeycomb channels increase surface area but generally increase gas-flow resistance and plugging sensitivity. Larger channels reduce pressure drop and improve fouling tolerance. RTO selection must balance heat transfer, fan power and contamination risk.

Higher honeycomb ceramic CPSI increases geometric surface area but usually reduces channel size and fouling tolerance. Select cell density by balancing heat transfer or catalyst area against pressure drop, dust loading and plugging risk.