SM 25x150 [2xM8] / N42 - magnetic separator
magnetic separator
Catalog no 130289
GTIN: 5906301812821
Diameter Ø [±0,1 mm]
25 mm
Height [±0,1 mm]
150 mm
Weight
0.01 g
393.60 ZŁ with VAT / pcs + price for transport
320.00 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
Strengths as well as weaknesses of rare earth magnets.
In addition to their magnetic capacity, neodymium magnets provide the following advantages:
- They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (in testing),
- Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
- By applying a reflective layer of gold, the element has an modern look,
- The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to the ability of flexible shaping and customization to unique projects, neodymium magnets can be produced in a variety of shapes and sizes, which increases their versatility,
- Universal use in innovative solutions – they serve a role in mass storage devices, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems
Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures 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 force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- We suggest a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
- Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
- Due to neodymium price, their price is higher than average,
Maximum lifting capacity of the magnet – what contributes to it?
Breakaway force was determined for optimal configuration, including:
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a thickness of min. 10 mm to ensure full flux closure
- with an ideally smooth touching surface
- under conditions of gap-free contact (metal-to-metal)
- under vertical application of breakaway force (90-degree angle)
- in temp. approx. 20°C
Lifting capacity in practice – influencing factors
Holding efficiency is affected by specific conditions, mainly (from most important):
- Clearance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
- Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick sheet does not close the flux, causing part of the flux to be lost into the air.
- Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
- Plate texture – ground elements guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
- Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures 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, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.
Safety rules for work with NdFeB magnets
Medical implants
Individuals with a heart stimulator should keep an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.
Crushing risk
Watch your fingers. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!
Heat warning
Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.
Shattering risk
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
No play value
NdFeB magnets are not suitable for play. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and necessitates urgent medical intervention.
Powerful field
Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.
Protect data
Device Safety: Strong magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).
Metal Allergy
Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, refrain from direct skin contact and select versions in plastic housing.
Impact on smartphones
Remember: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your phone, device, and navigation systems.
Fire risk
Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.
Caution!
Need more info? Check our post: Are neodymium magnets dangerous?
