Manufactured in polypropylene, this tube will withstand autoclaving (120°C for 15 minutes at 15 psi), boiling and centrifugation to 14,000rpm. The 5mL tube can be spun in the same centrifuges that accommodates a 15mL tube. It is also suitable for freezing to -90°C. A frosted marking area on the tube cap is provided for sample tagging and identification.