Cellulose acetate membrane. Ready-to-use units with 5.3 cm2 of available low adsorption filtration area for rapid sterile filtration of samples  for clarification of larger volumes with larger pore size units. For easy identification, Cyrolite housings are color coded by pore size. Sterilized Minisarts are individually packaged. If not otherwise stated minisarts are sterilized by ethylene oxide. Supplied individually wrapped and sterile, except for packs of 500 (Q). PES (Polyethersulfone), SFCA(Surfactant-free Cellulose Acetate), GF+SFCA (Glass Fiber +Surfactant-free Cellulose Acetate) and GF (Glass Fiber) can be sterilized by ethylene oxide or gamma irradiation.