MPL 40x18x10 SH / N38 - lamellar magnet

Pros and cons of NdFeB magnets.

Apart from their strong power, neodymium magnets have these key benefits:

• They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
• Magnets very well protect themselves against loss of magnetization caused by external fields,
• By covering with a decorative coating of silver, the element acquires an proper look,
• Magnets have excellent magnetic induction on the surface,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• In view of the possibility of precise shaping and adaptation to custom requirements, NdFeB magnets can be manufactured in a variety of forms and dimensions, which amplifies use scope,
• Significant place in high-tech industry – they are used in computer drives, electromotive mechanisms, advanced medical instruments, and other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
• NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in creating threads and complex shapes in magnets, we propose using a housing - magnetic mount.
• Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Highest magnetic holding force – what it depends on?

The declared magnet strength refers to the maximum value, obtained under ideal test conditions, namely:

• with the contact of a sheet made of special test steel, ensuring maximum field concentration
• with a cross-section minimum 10 mm
• with a surface perfectly flat
• without the slightest insulating layer between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at room temperature

Practical aspects of lifting capacity – factors

Effective lifting capacity is affected by working environment parameters, such as (from priority):

• Gap (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Base massiveness – too thin steel does not accept the full field, causing part of the power to be lost into the air.
• Steel type – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and holding force.
• Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.