Summary: 1. High dirt holding capacity, high filtering precision, slow pressure rise, long life cycle. 2. Acid and alkali-resistance, corrosion resistance, heat resistance for long term working in 600 centigrade. 3. High porosity, fine permeability, low pressure loss, high flow. 4. Pleated to enlarge filter area. 5. Easy to be machined, molded and welded. 6. Easy to clean and recycle. Main application: 1. High polymer filtration in the chemical industry and the plastic film industry. 2. High temperature and corrosion liquid filtration in the petroleum industry. 3. Hydraulic oil filtration and lubricating oil filtration in the mechanical equipment. 4. Liquid purification in medical industry, biological, food and drink industry. Bubble wrap inside, plywood case outside