SM 18x225 [2xM5] / N42 - magnetic separator
magnetic separator
Catalog no 130274
GTIN: 5906301812760
Diameter Ø [±0,1 mm]
18 mm
Height [±0,1 mm]
225 mm
Weight
0.01 g
498.15 ZŁ with VAT / pcs + price for transport
405.00 ZŁ net + 23% VAT / pcs
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SM 18x225 [2xM5] / N42 - magnetic separator
Magnetic properties of material N42
Physical properties of NdFeB
Shopping tips
Advantages and disadvantages of neodymium magnets NdFeB.
In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
- They do not lose their power approximately ten years – the reduction of lifting capacity is only ~1% (theoretically),
- They protect against demagnetization induced by ambient electromagnetic environments effectively,
- By applying a reflective layer of nickel, the element gains a clean look,
- They exhibit superior levels of magnetic induction near the outer area of the magnet,
- They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
- With the option for fine forming and targeted design, these magnets can be produced in various shapes and sizes, greatly improving design adaptation,
- Wide application in cutting-edge sectors – they are used in computer drives, electromechanical systems, clinical machines along with other advanced devices,
- Thanks to their power density, small magnets offer high magnetic performance, with minimal size,
Disadvantages of NdFeB magnets:
- They may fracture when subjected to a sudden impact. If the magnets are exposed to external force, we recommend in a metal holder. The steel housing, in the form of a holder, protects the magnet from breakage , and at the same time enhances its overall durability,
- They lose field intensity at increased temperatures. Most neodymium magnets experience permanent decline in strength when heated above 80°C (depending on the shape and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
- Due to corrosion risk in humid conditions, it is advisable to use sealed magnets made of synthetic coating for outdoor use,
- Limited ability to create internal holes in the magnet – the use of a magnetic holder is recommended,
- Health risk related to magnet particles may arise, especially if swallowed, which is notable in the family environments. It should also be noted that tiny components from these assemblies may interfere with diagnostics if inside the body,
- High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which may limit large-scale applications
Maximum magnetic pulling force – what contributes to it?
The given lifting capacity of the magnet corresponds to the maximum lifting force, determined in ideal conditions, specifically:
- using a steel plate with low carbon content, acting as a magnetic circuit closure
- of a thickness of at least 10 mm
- with a polished side
- in conditions of no clearance
- under perpendicular detachment force
- under standard ambient temperature
Lifting capacity in real conditions – factors
Practical lifting force is determined by elements, listed from the most critical to the less significant:
- Air gap between the magnet and the plate, as even a very small distance (e.g. 0.5 mm) causes a drop in lifting force of up to 50%.
- Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
- Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
- Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
- Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
- Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.
* Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet and the plate decreases the holding force.
Handle with Care: Neodymium Magnets
Neodymium magnets are over 10 times more powerful than ferrite magnets (the ones in speakers), and their strength can surprise you.
To handle magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.
Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.
Neodymium magnets generate intense magnetic fields that can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also damage videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.
Neodymium magnets can demagnetize at high temperatures.
In certain circumstances, Neodymium magnets can lose their magnetism when subjected to high temperatures.
Neodymium magnets are extremely delicate, they easily break as well as can become damaged.
Neodymium magnets are fragile as well as will crack if allowed to collide with each other, even from a distance of a few centimeters. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. At the moment of collision between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.
Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.
If the joining of neodymium magnets is not under control, at that time they may crumble and also crack. You can't approach them to each other. At a distance less than 10 cm you should hold them extremely firmly.
Dust and powder from neodymium magnets are flammable.
Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. If the magnet is crushed into fine powder or dust, it becomes highly flammable.
Neodymium magnets should not be in the vicinity youngest children.
Not all neodymium magnets are toys, so do not let children play with them. In the case of small magnets, they can be swallowed and cause choking. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.
Avoid bringing neodymium magnets close to a phone or GPS.
Magnetic fields can interfere with compasses and magnetometers used in aviation and maritime navigation, as well as internal compasses of smartphones and GPS devices. There are neodymium magnets in every smartphone, for example, in the microphone and speakers.
If you have a nickel allergy, avoid contact with neodymium magnets.
Studies show a small percentage of people have allergies to certain metals, including nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.
Neodymium magnets should not be near people with pacemakers.
Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.
Pay attention!
To show why neodymium magnets are so dangerous, see the article - How dangerous are strong neodymium magnets?.