High purity melt blown depth cartridges. Avasan (AVS) cartridges are manufactured with Parker’s proprietary melt blown manufacturing process using a specially formulated polypropylene polymer. This formulation provides a uniquely graded density filter cartridge designed for high purity applications. The fiber matrix of cartridge has been engineered to provide structural integrity throughout the long service life of the cartridge and the finish-free construction provides optimum fluid purity and eliminates foaming. Avasan’s inherent fluid compatibility properties plus graded density make it the economical filter choice for high clarity requirements.