Cartridge filters from MPF Engineered Filters have efficiency ratings up to 99.99%, maximizing performance and reducing maintenance and downtime. Three main types of filters are paper, spun bond, and felt. The paper cartridge filter is best suited for light, dry, free-flowing dust applications. The spun bond cartridge uses moisture resistant spun bond polyester, which has a bursting strength of 388 psi (2.7 mPA). The felt cartridge has a pleated felt configuration, which distributes gas and dust better, permits higher collection efficiency, cleans the media more efficiently, and lowers pressure drops.