★ Polytetrafluoroethylene (PTFE) is generally referred to as "non stick coating" or "easy to clean material". This kind of material has the characteristics of acid and alkali resistance, resistance to various organic solvents, and almost insoluble in all solvents. 

★ It has tightness, high lubrication, no sticky, electrical insulation, good aging resistance and excellent temperature resistance. It can work long term from 250 to 180 degrees. 

★ These centrifuge tubes are made in high purity PTFE Material. They are designed to have screw caps to prevent leakage.