Absolute Rated Pleated Polypropylene Filter Cartridges – 99.98% Efficiencyshelco MPX_MPN_MGF_MPA •Absolute Beta 5000 / 99.98% retention ratings of 0.2 microns •5.6 square feet of media surface area designed for optimal throughput and particle retention at a competitive price •100% polypropylene construction offers wide range of chemical compatibility •Rigid, molded cage protects pleated media and strengthens structural stability •Manufactured in Class 10,000 clean room for highest purity •Meets applicable CFR criteria and USP Class VI Biological Test for plastics