The laboratory bar is chemical and ; The maximum temperature is 250 degrees centigrade and the minimum temperature is -196 degrees centigrade. Mixer stir bar is made of PTFE. Not easy to demagnetize, work longer than others. These stir bars have a pivot ring around the center. They are designed to maintain the position in vessels with curved or uneven bottoms. The ring helps to reduce vibrations and wear, and reduce the effects of friction from contact with the vessel. Stirrer bar is widely applied in scientific research, universities, laboratories in the industrial and agricultural sectors as well as family usage., Manufacturer: Littimoon