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FAQ - Frequently Asked Questions

Which magnet coatings are there?

Table of Contents

Neodymium magnets (super magnets)

Neodymium reacts to oxygen and oxidises quickly if untreated. That's why all neodymium magnets in our shop are covered with a protective coating, which is so thin that it doesn't have any impact on the adhesive force of the magnet.
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
  • The copper-coloured surface rubs off with frequent use (similar to gold-coated magnets) and is therefore suitable for decorative purposes only.

Epoxy resin (Ni-Cu-Ni-Epoxy)

(in exceptional cases also just 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.

Zinc (Zn)

  • Colour: matt grey/blueish
  • Only zinc without Ni-Cu-Ni
  • More susceptible to corrosion than Ni-Cu-Ni
  • Can leave black marks
  • Thickness: approx. 4 micrometres

Teflon

  • Grey/anthracite
  • Only teflon without Ni-Cu-Ni
  • Nearly waterproof
  • Very rub-resistant
  • 12-25 micrometres thick

There is a variety of other coatings for neodymium magnets that we do not offer in our standard assortment.
Without coating
  • Naked magnet material, black/grey
  • Magnets oxidise and corrode quickly when they come in contact with oxygen and water
  • Magnets need to be covered air- and watertight quickly
  • We do not recommend having uncoated magnets manufactured.
Silver (Ni-Cu-Ni-Ag)
  • Shiny silver
  • Razor-thin coating over normal Ni-Cu-Ni coating, hence the same attributes
  • Difference purely visual
  • Material: Sterling Silver
  • Approx. 12 micrometres thick

Pot magnets

Our pot magnets, if not otherwise noted, are neodymium magnets with a Ni-Cu-Ni coating. The term "coating" in the product descriptions of pot magnets refers to the steel pot around the magnet. In most cases it is nickel (Ni); for the pot magnets that are painted white, green or black it is nickel with an additional powder coating.

Ferrite magnets

In theory, you could put various coats on ferrite magnets, but that is technically complex and expensive. The price for the coating would be greater than the price for the whole magnet.
Since ferrite magnets are weather-resistant even without protection, an additional coating is not necessary. Our ferrite magnets are therefore uncoated.