UHM series large-flow foldable filter core adopts a large diameter structure of 6.5 inches, with extremely high filtration area. The fluid flows from inside to outside and adopts the gradient filter structure from coarse to fine. The filter aperture gradually decreases along the direction of fluid movement, and the particles with different particle sizes are intercepted by stratification, which has a high pollution capacity and flow resistance, ensuring that all impurities are trapped inside the filter core. The filter elements of this series are the same size as those of 3M's high-flow filter elements. With good high temperature resistance and wide chemical compatibility, the filter and filter system has the advantages of high flow, small size and low investment. The inner and outer skeletons are reinforced with polypropylene to enhance the strength of the filter core, prevent deformation of the filter material and facilitate the replacement of the filter core. The inner filter core is made of polypropylene, and the end cover and filter layer are welded by hot melt. There is no adhesive present. The filter core will not cause secondary pollution to the filter separation medium during the whole process of use.