UI 17.5x5 [C310] / N38 - badge holder

Pros and cons of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They do not lose strength, even after nearly ten years – the drop in strength is only ~1% (theoretically),
• Neodymium magnets remain extremely resistant to loss of magnetic properties caused by external interference,
• By using a decorative layer of gold, the element acquires an professional look,
• Magnetic induction on the top side of the magnet remains very high,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Considering the potential of flexible molding and adaptation to individualized needs, magnetic components can be produced in a variety of forms and dimensions, which amplifies use scope,
• Versatile presence in electronics industry – they are used in mass storage devices, motor assemblies, diagnostic systems, also other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in compact constructions

What to avoid - cons of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
• Limited ability of producing threads in the magnet and complicated shapes - recommended is a housing - mounting mechanism.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
• Due to complex production process, their price is relatively high,

Maximum magnetic pulling force – what contributes to it?

The lifting capacity listed is a result of laboratory testing conducted under specific, ideal conditions:

• on a base made of mild steel, perfectly concentrating the magnetic flux
• whose thickness is min. 10 mm
• with a surface cleaned and smooth
• without any insulating layer between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• at ambient temperature room level

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower depending on the following factors, in order of importance:

• Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Steel thickness – too thin steel does not accept the full field, causing part of the flux to be lost to the other side.
• Steel grade – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
• Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
• Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. In addition, even a small distance {between} the magnet’s surface and the plate reduces the holding force.