Ought to I purchase a ferrite or neodymium magnet?
That is dependent upon how you propose to make use of the magnets. Beneath some help:
We particularly advocate ferrite magnets for the next circumstances:
Tight Price range
High Temperatures (80-250 °C)
Low aesthetics required
We particularly advocate neodymium magnets for the next circumstances:
Very high adhesive force required
Limited area (miniaturization)
Little weight required
Decoration/gift (good coating)
On the one hand, ferrite materials solely cost a fraction of the NdFeB materials. However, a neodymium magnet has an adhesive pressure that’s about 8 to 10 instances greater than that of a comparable ferrite magnet. If you happen to calculate the price per kg of adhesive pressure, ferrite magnets are about 2 to 3 times cheaper than neodymium magnets. That is very true for the block or ring magnets and for bigger quantities. (With disc magnets the price per kg of adhesive force is comparable.)
The cost advantage is only then related, nevertheless, if weight and dimension don’t matter, as a result of the ferrite magnet is far heavier and bigger than neodymium magnets with the identical adhesive pressure.
Ferrite magnets are much less topic to cost fluctuations than neodymium magnets as a result of their manufacturing doesn’t require rare earth metals.
Ferrite magnets can be used at temperatures between -40 °C and 250 °C, while most neodymium magnets lose their magnetization permanently at a temperature of 80 °C. However, temperatures below -40 °C are not any problem for neodymium magnets.
Ferrite magnets are chemical and rust resistant, whereas neodymium magnets are usually not appropriate for out of doors use (apart from rubberised Nd magnets).
Ferrite magnets can break into items once you repeatedly put a strain on them. Neodymium magnets are very brittle and crack simply, which might result in accidents of person or bystanders.
Loss of adhesive force
Neither ferrite nor neodymium magnets lose their magnetization by itself. They will solely be demagnetised by exterior elements like warmth or sturdy exterior magnetic fields.
Neodymium magnets typically have a tolerance of +/- 0,1 mm.
It is extra sophisticated with ferrite magnets: Their height-related normal tolerance is +/- 0,1 mm; their width- and length-related tolerance is 2%, however not less than 0,1 mm.
Smaller ferrite magnets have a quite weak magnetic subject and will be shielded fairly simply. It requires far more effort to defend neodymium magnets to be able to ship them.
Ferrite and neodymium magnets ought to at all times be transported at a distance of not less than 22 mm (we advocate 30 mm). In any other case, neodymium magnets can demagnetize and even reverse the polarity of ferrite magnets (see desk beneath).
Stronger neodymium magnets have the ability to demagnetize and even reverse the polarity of ferrite magnets (see desk beneath).
|Ferrite||Neodymium||AlNiCo||Sheets and tapes|
|Ferrite||–||22 mm||0 mm||0 mm|
|Neodymium||22 mm||–||43 mm||30 mm|
|AlNiCo||0 mm||43 mm||–||0 mm|
|Sheets and tapes||0 mm||30 mm||0 mm|
Ferrite magnets are usually not coated, they have an unattractive dark-gray color they usually stain below friction. Subsequently, ferrite magnets are usually not appropriate to be used on clothes, e.g. as title tags. The floor is uneven and edges could have dents.
Neodymium magnets have a gorgeous silver color because of the nickel-copper-nickel coating they usually do not stain below regular use. Subsequently, they’re very appropriate for decorations and presents.
Hazard for youngsters
Robust ferrite magnets are very massive, which makes it more durable for children to swallow them. Neodymium magnets of the identical dimension have a lot greater magnetization, which might result in severe issues when swallowed
Hazard for gadgets
Magnets can compromise digital gadgets like pacemakers and listen to aids. Ferrite magnets are usually not as sturdy as neodymium magnets, which makes them safer to be close to these gadgets. Nevertheless, we nonetheless advocate a protected distance for each magnet types.
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