SM 32x400 [2xM8] / N42 - magnetic separator

Pros and cons of rare earth magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
• They maintain their magnetic properties even under external field action,
• By using a decorative coating of silver, the element gains an proper look,
• They show high magnetic induction at the operating surface, which increases their power,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of accurate shaping as well as optimizing to concrete applications,
• Huge importance in modern industrial fields – they are utilized in computer drives, drive modules, precision medical tools, also multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated forms.
• Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products are able to complicate diagnosis medical after entering the body.
• With budget limitations the cost of neodymium magnets can be a barrier,

Magnetic strength at its maximum – what contributes to it?

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

• using a sheet made of low-carbon steel, functioning as a magnetic yoke
• whose thickness is min. 10 mm
• with an ideally smooth touching surface
• under conditions of no distance (metal-to-metal)
• during detachment in a direction vertical to the plane
• at temperature room level

What influences lifting capacity in practice

During everyday use, the actual holding force is determined by many variables, presented from most significant:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Plate material – mild steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
• Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
• Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. Moreover, even a small distance {between} the magnet and the plate decreases the lifting capacity.