2/ What materials are used for the tube body and closure? The transparent body is made of high-strength polycarbonate (PC), and it uses a polypropylene (PP) linerless screw cap for leakproof sealing.

3/ What centrifugal forces can this tube withstand? Under standard conditions with the PP closure, it is leakproof up to 10 000 × g. When used with an optional sealing cap assembly, 30 mL and 50 mL sizes can reach 50 000 × g; 85 mL formats fit universal rotors and can be spun up to 10 000 × g leakproof.

4/ What temperature range does the tube support? The polycarbonate body tolerates temperatures from –135 °C to +135 °C, making it suitable for both deep-freeze and elevated-temperature applications.

5/ Is the tube autoclavable? Yes. The tube can be autoclaved at 121 °C, but repeated autoclaving may shorten its service life.

6/ What rotor type is the round-bottom tube designed for? Its rounded “Oak Ridge” bottom is compatible with high-speed refrigerated or non-refrigerated rotors, ensuring even balance and efficient pellet formation.

7/ How do I achieve leakproof performance? Always use the original PP screw cap. For applications above 10 000 × g, equip a sealing cap or sealing cap assembly (sold separately) to maintain leakproof integrity.

8/ How full should the tube be before centrifugation? To prevent collapse or valve failure, fill the tube to at least 80 % of its total capacity prior to spinning.

9/ Are replacement closures available? Genuine sealing cap assemblies and replacement PP caps are available from Thermo Fisher Scientific or authorized distributors (as QTE Technologies) for continued leakproof operation.

10/ Can these tubes be recycled after retirement? Polycarbonate and polypropylene components are recyclable in many facilities once the tubes reach end-of-life. Check local recycling guidelines for PC and PP plastics.