Due to the long-term operation of DPF in high temperature and corrosive atmosphere, DPF materials need to have excellent thermal stability, high mechanical strength, good heat shock resistance and other properties. The theoretically optimal DPF material should have high thermal conductivity and low thermal expansion coefficient. The higher thermal conductivity results in a uniform temperature distribution inside the DPF during regeneration, producing small maximum temperatures and temperature gradients. A low coefficient of thermal expansion can effectively reduce the compressive and tensile stresses generated by the radial and axial temperature gradients in the DPF, avoiding premature cracking and even causing DPF rupture, leading to its failure due to a sharp decrease in PM filtration efficiency.

Due to its low cost, cordierite DPF is widely used for heavy truck emission control, and also has the advantage of low thermal expansion coefficient, which can be made into a monolithic structure. However, due to its low melting point and heat capacity, it is prone to co melting with ash content and is easily burned through in uncontrollable regeneration situations. Aluminum titanate DPF has excellent thermal shock resistance, although its thermal conductivity is low, it has a large heat capacity and is suitable for being made into a monolithic structure. The microstructure of mullite DPF is composed of a large number of needle shaped mullite grains interlocked, with high porosity and average pore diameter, as well as high specific surface area, suitable for applications with large catalyst coating amounts; But it has a large coefficient of thermal expansion and needs to be made into a segmented structure. Silicon carbide DPF has high mechanical strength, resistance to fatigue, acid and ash corrosion, as well as large heat capacity and thermal conductivity. Its high coefficient of thermal expansion prevents it from being made into a monolithic structure. The thermal conductivity and thermal expansion coefficient of silicon nitride are between those of cordierite and silicon carbide, with a low Young's modulus and excellent resistance to thermal shock. It can be made into a one-piece structure DPF that does not require segmentation. The microstructure of silicon nitride DPF has many micro protrusions, which can effectively increase the specific surface area of the catalyst, improve the contact area between soot and catalyst, and effectively improve the regeneration efficiency of DPF; However, due to its high production cost, the commercial prospects are currently unclear. Magnesium titanate, considered as the third-generation DPF material, has high thermal stability and a relatively narrow pore structure, which makes magnesium titanate DPF have high filtration efficiency and low back pressure loss, and has a wide range of application prospects. Currently, it is still in the laboratory research stage.