HDPE screw caps.
Available with a blue HDPE leak-proof screw cap, the clear polypropylene (PP) conical bottom centrifuge tubes feature a smooth hydrophobic internal surface to minimize wall effect. Both the tubes and caps are designed with flat threads for vacuum-type, leak-free closure at a pressure of >700 mm Hg. Bold blue graduations are easy to read, and a frosted surface area makes writing easier. Autoclavable at 121°C and 15 psi for 30 minutes. Radiation sterilized.
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