Our premium flat top microcentrifuge tube is built for high impact usage and will withstand over 30,000 x g when spun. Thicker walls make this the tube of choice for extreme stress, high spinning speeds, autoclaving, prolonged boiling, chemical resistance and freezing. Will withstand temperature ranges of -80°C (-112°F) to 121 °C (250°F). Made of high clarity polypropylene that are resistant to most chemical reagents. Carefully manufactured with a shaded writing area and molded graduations. Boil Proof, RNase/DNase, RNA/DNA, ATP and pyrogen free.