Saf-T-Seal screw cap microcentrifuge tubes are strong enough to withstand centrifugation up to 20,000 x g. Suitable for use in vapor-phase liquid nitrogen storage, -80°C freezers, boiling, and autoclaving. Deep external threads protect against sample loss and seal failure. An interior U channel in the lid keeps the ethylene propylene rubber (EPR) "O"-ring in place as the cap is tightened. Certified free of detectable RNase, DNase, and DNA. Tested pyrogen free. Autoclavable.

Tubes and caps are packaged in separate bags.