Polylab Centrifuge Tubes with round bottom are moulded in Polypropylene & Polycarbonate. These tubes have excellent clarity and are strong enough to be used upto 50,000xG. These tubes can be autoclaved,however, repeated autoclaving in PC tubes reduces their mechanical.
Oak Ridge Centrifuge Tubes,made of Polypropylene, hav excellent contact clarity and can be used upto 50,000xG. The screw cap is fitted with silicon O-Ring making it totally leakproof. These tubes should not be used below 4DegC.