SM 32x200 [2xM8] / N52 - magnetic separator

Strengths as well as weaknesses of neodymium magnets.

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:

• Their strength is durable, and after around 10 years it drops only by ~1% (theoretically),
• They are resistant to demagnetization induced by external disturbances,
• By applying a shiny layer of silver, the element has an modern look,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
• Possibility of precise modeling and optimizing to precise conditions,
• Universal use in modern technologies – they are used in magnetic memories, electric motors, medical devices, as well as technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complex forms in magnets, we recommend using cover - magnetic mount.
• Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
• With large orders the cost of neodymium magnets is a challenge,

Maximum holding power of the magnet – what contributes to it?

Information about lifting capacity was determined for optimal configuration, including:

• with the contact of a sheet made of special test steel, ensuring maximum field concentration
• whose thickness reaches at least 10 mm
• characterized by lack of roughness
• without any insulating layer between the magnet and steel
• under axial force direction (90-degree angle)
• at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

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

• Distance – the presence of any layer (paint, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
• Base massiveness – too thin plate does not accept the full field, causing part of the power to be wasted to the other side.
• Material type – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
• Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.