Medium alkali glass fiber filter material has a high temperature resistance and can be used for a long time at about 300°C. It is also relatively cheap and has ideal gas resistance. Therefore, it has been widely used in many industries. It can be mainly divided into three series: graphite treatment, silicone oil treatment, and body treatment. It is made of medium (no) alkali glass fiber twisted yarn through a loom. It has high temperature resistance, good chemical corrosion resistance, and easy dust removal. Therefore, it is an ideal filter material for high-temperature smoke emission enterprises, especially for cement shaft kiln enterprises.