Spun Bonded Filter Cartridges are made of 100% polypropylene fibers. These fibers have been carefully spun together to form a true gradient density from outer to inner surface. Spun Bonded Filter Cartridges are available with core and without core version. The superior structure remains integral even under severe operating conditions and is no media migration. Polypropylene fibers are blown continuous on central molded core, without the need for binders, resins or lubricants. Operation unfiltered fluid passes through depth filter matrix, enables the progressive retention of finer particles, providing high efficiency, high dirt retention, and filter life. Fluid flows from outside to inside through filter media. Particulates are held securely in the filter matrix and clean fluid flows to the downstream side of cartridge.