SM 18x300 [2xM5] / N42 - magnetic separator
magnetic separator
Catalog no 130277
GTIN: 5906301812791
Diameter Ø [±0,1 mm]
18 mm
Height [±0,1 mm]
300 mm
Weight
0.01 g
664.20 ZŁ with VAT / pcs + price for transport
540.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Magnetic properties of material N42
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Advantages as well as disadvantages of rare earth magnets.
Besides their immense strength, neodymium magnets offer the following advantages:
- They have stable power, and over around 10 years their performance decreases symbolically – ~1% (in testing),
- Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
- The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Magnetic induction on the surface of the magnet turns out to be extremely intense,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to versatility in designing and the capacity to adapt to unusual requirements,
- Huge importance in future technologies – they find application in mass storage devices, electric drive systems, diagnostic systems, as well as modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions
Disadvantages of neodymium magnets:
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
- Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures 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 immune to moisture, in case of application outdoors
- We recommend cover - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
- Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices can disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Optimal lifting capacity of a neodymium magnet – what affects it?
The force parameter is a theoretical maximum value performed under specific, ideal conditions:
- with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
- with a thickness of at least 10 mm
- characterized by smoothness
- without the slightest air gap between the magnet and steel
- under vertical force direction (90-degree angle)
- at conditions approx. 20°C
Practical aspects of lifting capacity – factors
Real force is affected by specific conditions, including (from priority):
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
- Surface quality – the more even the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a slight gap {between} the magnet and the plate lowers the holding force.
Safety rules for work with neodymium magnets
Fire risk
Dust created during machining of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Pinching danger
Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.
Do not give to children
Always store magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are life-threatening.
Nickel allergy
Certain individuals suffer from a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to a rash. We suggest use safety gloves.
Cards and drives
Avoid bringing magnets near a purse, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.
Magnetic interference
GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.
Pacemakers
Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can disrupt the functioning of the implant.
Do not underestimate power
Be careful. Rare earth magnets act from a distance and connect with massive power, often quicker than you can move away.
Operating temperature
Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.
Beware of splinters
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.
Danger!
Need more info? Read our article: Are neodymium magnets dangerous?
