Polypropylene (PP) housing available with PTFE or PES membrane, or PP depth media All-polypropylene housing is thermally fused and offers broad chemical compatibility; diameter is a standard 78 mm . Capsules are sterilizable by autoclave or ethylene oxide (EtO); . Max operating pressure is 57 psi (3.9 bar); max operating temperature is 140°F (60°C). Capsules are vented at both ends for bleeding trapped air and for draining Polypropylene Depth-Media Capsules offer high dirt holding capacity with superior retention. PP fibers are thermally welded to prevent slough-off and to minimize changes in pore size. Use these filters for high purity water and prefiltration applications.