In China, 40mm magnetic stir bars are widely produced using a magnetic core (typically Alnico V or Neodymium) encased in a chemically inert PTFE (Teflon) coating.

Key Specifications

• Dimensions: Typically 40mm in length with a diameter ranging from 6mm to 10mm.
• Material: Outer coating is PTFE (Teflon), providing resistance to strong acids, alkalis, and organic solvents.
• Shape Options: Cylindrical (standard), pivot ring (reduces friction on uneven bottoms), and oval.