It has high porosity, high dirt holding capacity, corrosion resistance, (maximum delay the service life of the filter), and the multi-dimensional tortuous microporous structure can effectively intercept the ability to cut gel, and is easy for subsequent processing such as filter element folding. Mainly used in polyester, polypropylene, aramid, polyethylene, nylon, polyethylene terephthalate, polyester film, lithium battery separator, packaging film and other industries.