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MAGCRAFT® Brand Rare
Earth Neodymium Magnets
Rare earth magnets are the strongest type of
permanent magnet currently made. They are amazingly powerful for their size and
have innumerable uses. MAGCRAFT® brand magnets are sold
exclusively through National Imports LLC and its authorized distributors.
The MAGCRAFT® line of permanent magnets, packaged in the
MAGPAK™ system are composed of licensed grade 40 neodymium iron boron magnetic
material and are plated in nickel-copper-nickel for a shiny corrosion resistant
finish.
Rare Earth Magnet Composition
Rare earth magnets are magnets composed of alloys of the
Lanthanide group of elements. The two Lanthanide elements most prevalent in the
production of permanent magnets are Neodymium and Samarium. There are numerous
alloy formulations of rare earth magnets covered under many different patents
but the most common commercial varieties are Neodymium-Iron-Boron (NdFeB) and
Samarium Cobalt (SmCo). Neodymium-Iron-Boron magnets are the most advanced
commercialized permanent magnet material available today.
Rare earth magnets are available in sintered and
bonded forms. Sintered magnets are a type of ceramic composed of the compressed
powder of the alloy material being used. Sintering involves the compaction of
fine alloy powder in a die and then fusing the powder into a solid material with
heat.
While the sintered magnets are solid, their physical properties are more similar
to a ceramic and are easily broken and chipped. Bonded magnets use a polymer base to hold the alloy powder together. The energy
product of bonded magnets is much lower than that of the sintered magnets.
Sintered NdFeB magnets are generally plated or coated with a material to prevent
corrosion. There are various coatings available.
Nickel-Copper-Nickel plating has excellent corrosion resistance and durability
as well as providing an clean and shiny appearance. All of our stock
rare earth magnets are sintered Neodymium-Iron-Boron magnets plated in
Nickel-Copper-Nickel.
Magnet Grades
The grade of a magnet directly refers to the Maximum Energy
Product of the material that composes the magnet. It in no way refers to the
physical properties of the magnet. Simplistically, grade is generally used to
describe how "strong" a permanent magnet material is. The energy product is
specified in the units Gauss Oersted. One MGOe is 1,000,000 Gauss Oersted. A
grade forty (N40) would have a Maximum Energy Product of 40 MGOe. The higher the
grade the “stronger” the magnet.
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