Sartorius, 17765-----S, Minisart 0.45 um Syringe Filter, Regenerated Cellulose. Non-sterile Minisart ® RC syringe filters are supplied in bulk packs. This reduces waste and makes the handling easier whenever the application allows clarification under non-sterile conditions, like this is the case for the majority of sample preparation steps prior to HPLC or GC analysis.