Neodymium Magnets Coating Info

We use the following coatings on our neodymium magnets:

• Nickel (Ni-Cu-Ni)
  By far the most frequently used coating; Colour: shiny metallic; Good price/performance ratio; Thickness: approx. 12 micro metres.
• Gold-coating (Ni-Cu-Ni-Au)
  Razor-thin coating (24k) over normal Ni-Cu-Ni coat, but with the same features; Colour: shiny metallic; Thickness of gold-coating without Ni-Cu-Ni: 0,05 micro metre; Thickness of whole coating: approx. 12 micro metres; The gold-coating rubs off easily with frequent use. It is therefore suitable for decorative purposes only, not for playing or working.
• Chrome (Ni-Cu-Ni-Cr)
  Better resistance against rubbing and pressure (that's why we use this coating for our sphere magnets) Colour: dull, grey-metallic Thickness: approx. 15 micro metres
• Copper (Ni-Cu)
  Colour: shiny brown-red-gold. The colour may change over time due to oxidation (darkening, spots)! Slightly weaker rubbing and impact resistance than Ni-Cu-Ni Slightly weaker corrosion resistance than als Ni-Cu-Ni Thickness: approx. 10 micro metres
• Epoxy resin (Ni-Cu-Ni-Epoxy)
  Colour: black almost 100% non-corrosive, as long as coating is intact not shock-resistant (crumbles quickly) Thickness: approx. 10 micrometre Even the smallest, not visible to the eye, damages of the coating will cause damage to the magnet in the long term when exposed to moisture.
• Teflon (PTFE)
  0.08'' thickness or more; White Color. The raw materials of Teflon is from DuPont and approved by the test (FDA method) of Daikin industries. Good chemical stability and corrosion resistance, frequently used dental and medical applications
• Rubber/Plastic
  0.04'' thickness; various color highly corrosion resistant, increase friction