The key of the bag filter is filter material, the filter material is fiber fabric. The characteristics of filter material are related to the material and fabric structure.

(industrial) materials are natural fibers such as cotton, wool, synthetic fiber, inorganic non metallic fiber, such as glass fiber, ceramic fiber, carbon fiber, etc.. Due to the performance of some of the shortcomings of natural fiber, has been rarely used. Inorganic fiber heat resistance, but in addition to the glass fiber, most of the development stage, the price is more expensive, less practical application. At present the most widely used is a variety of synthetic fibers, and with the development of chemical industry, synthetic fiber varieties continue to increase. The characteristics of several kinds of filter materials are introduced in this paper.

Polyester fiber. High strength after nylon; heat resistance is better, subjected to temperature 423^ 1000 dagger strength of decline is not more than 50^. In 4131^ temperature can be normal use; acid and weak reduction. Polyester is the application of more materials.

Nylon 'nylon polyamide fiber). High strength, good elasticity, good fracture resistance, smooth surface; Jin to 66 safe use temperature is 363 ~ 368! ^; alkali, not resistant to strong acid.

Aryl sulfone fiber aromatic polyamide (Nomex) with better heat resistance in dry and hot conditions (including dust and gas temperature above the acid dew point), normal use up to 5031^; under normal temperature, acid and alkali resistant and strong; high temperature by alkali decomposition; acid resistance is better than nylon, but less than polyester; ability of fluoride.