Screw top Micro tube sterile assemblies are ideal for sample preparation, processing, storage and transport. Also used for boiling applications, centrifugation and vapor phase liquid nitrogen. Tubes are manufactured from high clarity virgin polypropylene and are autoclavable. Grip caps are manufactured from polypropylene with an inert thermoplastic elastomer (TPE) sealing ring and grip ribs molded directly into the cap. Max RCF is 20, 000G. Temperature range of -196°c to 121°c (not for immersion in liquid nitrogen). sterilized by irradiation (SAL 10-6), RNase/DNase free and non-pyrogenic. Every case is printed with the lot number for quality traceability.