These 1.5 ml tubes are able to withstand 20,000 g and will not open during boiling. Made of polypropylene. The ultra smooth, conical bases allow 100% visibility. Frosted side surface area for writing. Accurate and visible graduation markings. A thin membrane in middle of the cap allows easy syringe penetration. Autoclavable up to 121°C (250°F), under 15 psi of pressure for 10 to 15 minutes with drying.

Clear tubes are boil-proof, coloured tubes are not boil-proof.