The centrifuge tube is made of high-purity PP material, , no pyrogen, no DNAs/RNase, autoclavable at 121°C/370°F, freezer to -80°C/-230°F. The centrifuge tube design has a longer cap with a sealing ring to prevent leakage. The lid can be tightly screwed onto the centrifuge tube, which has excellent sealing performance and effectively prevents liquid leakage. Smooth and flat inner , no residue solution. The centrifuge tube also includes a large white writing area for easy marking and identification. The patches are great for marking, and the graduations and writing area are chlorine . The transparent exterior with high visibility allows you to easily view the samples inside, the 50ml centrifuge tubes are sterile with easy-to-read black scales from 5.0ml to 50ml in 2.5ml increments. These centrifuge tubes are widely used in biochemistry and molecular biology, pharmacy and chemical laboratories, clinical diagnostic experiments, food science, etc.