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.

The newest Saf-T-Seal screw cap tubes have an integrated TPE seal that will never slip out of place. TPE grips are molded into the outer edge of the polypropylene cap for secure handling under tough conditions. Certified free of detectable RNase, DNase, and DNA. Tested pyrogen free. Graduated with frosted writing surface. Autoclavable.

Each pack has 500 tubes and 500 caps. Tubes and caps are packaged in separate bags. The mixed color option includes blue, green, orange, red, violet, and yellow caps.