Sartorius, 17765-----Q, Minisart 0.45um,1" RC25 Syringe Filter, Regenerated Cellulose,500pcs Minisart® RC syringe filters with hydrophilic, solvent-resistant regenerated cellulose (RC) membranes. The filter units are ready-to-use and allow for simple, rapid and reliable ultracleaning of small-volume samples for the HPLC or GC analysis.