Ideal for applications in freezer storage, autoclaving, boiling, or irradiation. Tubes are made of reusable polypropylene copolymer (PPCO). Seamless conical construction with squared external threads prevents hang up of samples and reduces contamination. External ridges fit rack serrations and allow one-handed opening.

Colored PPCO screw caps are fitted with an ethylene propylene O-ring for reliable, leakproof performance. Compatible with most microcentrifuges with fixed angle heads. Withstands over 30000×g.