PTFE micro-pore film compound material is used to filter the high temperature smoke and dust  appearing during the productions of iron-steel, cement, fire-resistant material and chemical fertilizer. Compared to the traditional filter material, it has advantages of a high efficiency of dust-protection and non-influence by the location of particles. It is able to get the ultra-small dust with low expellant density. It is easy to clear the dust on surface filter. The obstruction of dust-resistance is low and stable with good transparency.  With its oil-expellant and non-stick, the material is suitable to use in dealing with adhesive dust.