SM 25x250 [2xM8] / N42 - magnetic separator
magnetic separator
Catalog no 130293
GTIN: 5906301812869
Diameter Ø [±0,1 mm]
25 mm
Height [±0,1 mm]
250 mm
Weight
0.01 g
688.80 ZŁ with VAT / pcs + price for transport
560.00 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 field intensity, neodymium magnets offer the following advantages:
- Their strength is maintained, and after around 10 years it decreases only by ~1% (theoretically),
- They possess excellent resistance to magnetic field loss as a result of opposing magnetic fields,
- A magnet with a shiny gold surface has better aesthetics,
- The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of detailed shaping as well as adapting to concrete conditions,
- Significant place in modern industrial fields – they serve a role in computer drives, electric drive systems, advanced medical instruments, as well as complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages of NdFeB magnets:
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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 extremely resistant to heat
- They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing threads and complicated shapes in magnets, we propose using casing - magnetic mount.
- Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Breakaway strength of the magnet in ideal conditions – what it depends on?
The lifting capacity listed is a result of laboratory testing executed under the following configuration:
- with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of at least 10 mm to ensure full flux closure
- characterized by lack of roughness
- under conditions of ideal adhesion (metal-to-metal)
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Determinants of practical lifting force of a magnet
It is worth knowing that the magnet holding will differ subject to elements below, in order of importance:
- Air gap (betwixt the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
- Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.
Safe handling of neodymium magnets
Crushing force
Large magnets can break fingers instantly. Never put your hand betwixt two attracting surfaces.
Safe operation
Exercise caution. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can move away.
Danger to the youngest
Absolutely store magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are tragic.
Protect data
Data protection: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).
Maximum temperature
Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).
Phone sensors
GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.
Sensitization to coating
A percentage of the population suffer from a contact allergy to nickel, which is the common plating for neodymium magnets. Prolonged contact might lead to an allergic reaction. It is best to wear safety gloves.
Fragile material
NdFeB magnets are sintered ceramics, which means they are very brittle. Impact of two magnets leads to them shattering into small pieces.
Implant safety
Warning for patients: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or ask another person to handle the magnets.
Fire warning
Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
Caution!
Want to know more? Check our post: Why are neodymium magnets dangerous?
