ALpHA filters are absolute rated depth type filters constructed of 100% polypropylene. They contain a graded density polypropylene microfiber filter medium that provides a tapered pore structure. ALpHA® filters deliver superior flow rates and high throughput, with absolute submicron particulate retention and high dirt holding capacity. Their all-polypropylene construction provides broad chemical compatibility and low extractable levels in a wide range of fluids and applications.