CELLTREAT Non-sterile 500mL Centrifuge Bottle PP. Packages Non-sterile in a case of 2. Centrifuge Bottles have a rigid body for low to moderate speed centrifugation of biological and chemical samples. Manufactured from high quality polypropylene for excellent chemical resistance. Bottle must be filled 75% of total capacity to obtain maximum results. Centrifuge Bottles are reusable and autoclavable. Packaged non-sterile in zip-closure bags.