With its nature of crystallization, crystallo-chemical formula cordierite has extremerly low coefficient of thermal expansion (CTE); High specific surface area, low pressure drop, rapid light-off time and reliable & durable performance are achieved through high cell density of 400 CPSI; Honeycomb-like structure with thousands of parallel channels forces exhaust gases into the turbulent flow regime resulting in better contact between emission and precious metal, enhanced mass-transfer conditions, and higher conversion efficiency; Cordierite DPF is mailnly used in the diesel engine automobile to solve the air pollution problem. The effect is better than the ceramic substrate.