DPF substrate has the special structure of one end open and other end closed.  It has many micro pores on its inner walls. These micro pores allow the gas going through the wall, but reject most of the particulate matter in the exhaust gas. When the exhaust gas from diesel engine enters into one DPF channel from the open end, due to the closed other end, the exhaust gas is forced to go through from the micro pores of the inner wall, and exhaust out from the neighbor open channel. In this process, those particulate matters which have bigger size than these micro pores are captured on the inner wall, and hence achieve the filtering effect.

1. The DPF can capture more than 95% particulate matter.
2. The porosity of DPF is more than 50%.