A, application field Polyester waterproof and oil filter material can be widely used in metallurgical, chemical, cement, machinery, tobacco, food processing and other fields of air purification and material recycling. Especially suitable for larger gas dust contains water or oily and hygroscopicity and wet dust condition. In addition, more rain in the south of China region, tend to be more than 80% relative humidity in the air humidity environment, the use of waterproof and oil filter material can prevent or reduce the phenomenon of bag dust easily viscosity, strong condensation resistance, improve the service life of the filter material and the work efficiency.