In polypropylene, sterile, DNase e RNase free, non-pyrogenic certified, non-cytotoxic, particularly suitable to study and research. Flat screw cap high sealed with fast closure. Serigraphed graduated scale and wide marking area. On each pack identification number and batch number are present, for an easy traceability. RCF max = 15,000 g. (fixed angle rotor) 4,000 g. (swing bucket). Autoclavable at +121 °C and freezable up to -80 °C.