3M NanoSHIELD MDC Hollow Fiber Series filter capsules contain 3M NanoSHIELD Series filter cartridges avail??ble with membrane material of construction of polypropylene, and polyethylene. 3M NanoSHIELD MDC Hollow Fiber Series filter capsules have been engineered to com??ine a high level of particle retention with high flow rates and low pressure drop for the most demanding applica??ions.