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

Strengths as well as weaknesses of rare earth magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

• They retain magnetic properties for nearly 10 years – the drop is just ~1% (according to analyses),
• They do not lose their magnetic properties even under close interference source,
• Thanks to the smooth finish, the layer of nickel, gold, or silver-plated gives an clean appearance,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which allows for strong attraction,
• 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...
• Possibility of precise modeling as well as optimizing to complex requirements,
• Key role in innovative solutions – they serve a role in magnetic memories, drive modules, diagnostic systems, as well as other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 stable to moisture, in case of application outdoors
• We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex forms.
• Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
• With budget limitations the cost of neodymium magnets is economically unviable,

Maximum lifting capacity of the magnet – what affects it?

The specified lifting capacity refers to the peak performance, recorded under optimal environment, meaning:

• with the contact of a yoke made of special test steel, ensuring full magnetic saturation
• whose thickness is min. 10 mm
• with a plane free of scratches
• under conditions of gap-free contact (surface-to-surface)
• for force applied at a right angle (pull-off, not shear)
• at standard ambient temperature

Magnet lifting force in use – key factors

Please note that the working load will differ influenced by the following factors, in order of importance:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
• Direction of force – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
• Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and holding force.
• Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
• Temperature – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the lifting capacity.