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MPL 25x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020392

GTIN: 5906301811893

5

length [±0,1 mm]

25 mm

Width [±0,1 mm]

15 mm

Height [±0,1 mm]

2 mm

Weight

5.63 g

Magnetization Direction

↑ axial

Load capacity

3.06 kg / 30.01 N

Magnetic Induction

120.03 mT

Coating

[NiCuNi] nickel

2.39 with VAT / pcs + price for transport

1.940 ZŁ net + 23% VAT / pcs

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MPL 25x15x2 / N38 - lamellar magnet

Specification/characteristics MPL 25x15x2 / N38 - lamellar magnet
properties
values
Cat. no.
020392
GTIN
5906301811893
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
25 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
5.63 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
3.06 kg / 30.01 N
Magnetic Induction ~ ?
120.03 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
coercivity bHc ?
860-915
kA/m
coercivity bHc ?
10.8-11.5
kOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
actual internal force iHc
≥ 955
kA/m
actual internal force iHc
≥ 12
kOe
max. temperature ?
≤ 80
°C

Physical properties of NdFeB

properties
values
units
Vickers hardness
≥550
Hv
Density
≥7.4
g/cm3
Curie Temperature TC
312 - 380
°C
Curie Temperature TF
593 - 716
°F
Specific resistance
150
μΩ⋅Cm
Bending strength
250
Mpa
Compressive strength
1000~1100
Mpa
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

Flat neodymium magnets i.e. MPL 25x15x2 / N38 are magnets created from neodymium in a rectangular form. They are valued for their exceptionally potent magnetic properties, which surpass ordinary ferrite magnets.
Thanks to their mighty power, flat magnets are commonly applied in products that require strong holding power.
Typical temperature resistance of flat magnets is 80°C, but depending on the dimensions, this value grows.
In addition, flat magnets commonly have different coatings applied to their surfaces, such as nickel, gold, or chrome, to improve their durability.
The magnet with the designation MPL 25x15x2 / N38 and a magnetic force 3.06 kg weighing only 5.63 grams, making it the perfect choice for projects needing a flat magnet.
Neodymium flat magnets offer a range of advantages compared to other magnet shapes, which cause them being the best choice for a multitude of projects:
Contact surface: Due to their flat shape, flat magnets guarantee a greater contact surface with other components, which is beneficial in applications requiring a stronger magnetic connection.
Technology applications: They are often utilized in various devices, such as sensors, stepper motors, or speakers, where the thin and wide shape is important for their operation.
Mounting: This form's flat shape simplifies mounting, especially when it is necessary to attach the magnet to some surface.
Design flexibility: The flat shape of the magnets allows creators greater flexibility in arranging them in structures, which can be more difficult with magnets of other shapes.
Stability: In some applications, the flat base of the flat magnet can provide better stability, reducing the risk of sliding or rotating. It’s important to keep in mind that the optimal shape of the magnet is dependent on the given use and requirements. In some cases, other shapes, such as cylindrical or spherical, are a better choice.
Attracted by magnets are ferromagnetic materials, such as iron, nickel, cobalt and alloys of metals with magnetic properties. Moreover, magnets may lesser affect some other metals, such as steel. It’s worth noting that magnets are utilized in various devices and technologies.
The operation of magnets is based on the properties of their magnetic field, which arises from the ordered movement of electrons in their structure. Magnetic fields of magnets creates attractive forces, which attract materials containing iron or other magnetic materials.

Magnets have two poles: north (N) and south (S), which attract each other when they are oppositely oriented. Similar poles, e.g. two north poles, act repelling on each other.
Thanks to this principle of operation, magnets are often used in magnetic technologies, e.g. motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the greatest strength of attraction, making them perfect for applications requiring powerful magnetic fields. Additionally, the strength of a magnet depends on its dimensions and the materials used.
Magnets do not attract plastics, glass items, wood or most gemstones. Furthermore, magnets do not affect most metals, such as copper items, aluminum, gold. These metals, although they are conductors of electricity, do not exhibit ferromagnetic properties, meaning that they do not respond to a standard magnetic field, unless exposed to a very strong magnetic field.
It should be noted that extremely high temperatures, above the Curie point, cause a loss of magnetic properties in the magnet. Every magnetic material has its Curie point, meaning that once this temperature is exceeded, the magnet stops being magnetic. Interestingly, strong magnets can interfere with the operation of devices, such as compasses, credit cards and even medical equipment, like pacemakers. Therefore, it is important to exercise caution when using magnets.
A neodymium plate magnet with classification N52 and N50 is a strong and powerful metallic component shaped like a plate, providing high force and universal applicability. Good price, 24h delivery, stability and broad range of uses.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their pulling strength, neodymium magnets provide the following advantages:

  • They virtually do not lose strength, because even after 10 years, the decline in efficiency is only ~1% (based on calculations),
  • They remain magnetized despite exposure to magnetic surroundings,
  • The use of a polished silver surface provides a eye-catching finish,
  • They exhibit elevated levels of magnetic induction near the outer area of the magnet,
  • Thanks to their enhanced temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C or more,
  • With the option for tailored forming and precise design, these magnets can be produced in numerous shapes and sizes, greatly improving design adaptation,
  • Key role in modern technologies – they are utilized in computer drives, rotating machines, diagnostic apparatus as well as high-tech tools,
  • Thanks to their efficiency per volume, small magnets offer high magnetic performance, in miniature format,

Disadvantages of neodymium magnets:

  • They are fragile when subjected to a heavy impact. If the magnets are exposed to physical collisions, they should be placed in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from breakage while also increases its overall resistance,
  • They lose power at elevated temperatures. Most neodymium magnets experience permanent loss in strength when heated above 80°C (depending on the form and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • Magnets exposed to damp air can corrode. Therefore, for outdoor applications, we suggest waterproof types made of plastic,
  • Limited ability to create threads in the magnet – the use of a mechanical support is recommended,
  • Health risk related to magnet particles may arise, in case of ingestion, which is significant in the context of child safety. Additionally, tiny components from these magnets have the potential to hinder health screening when ingested,
  • Due to a complex production process, their cost is above average,

Highest magnetic holding forcewhat contributes to it?

The given pulling force of the magnet means the maximum force, assessed in a perfect environment, namely:

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • having a thickness of no less than 10 millimeters
  • with a refined outer layer
  • in conditions of no clearance
  • in a perpendicular direction of force
  • at room temperature

Determinants of lifting force in real conditions

In practice, the holding capacity of a magnet is conditioned by these factors, in descending order of importance:

  • Air gap between the magnet and the plate, as even a very small distance (e.g. 0.5 mm) can cause 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 determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the holding force.

Caution with Neodymium Magnets

Neodymium magnets can demagnetize at high temperatures.

Under specific conditions, Neodymium magnets can lose their magnetism when subjected to high temperatures.

The magnet coating contains nickel, so be cautious if you have a nickel allergy.

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.

Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.

The strong magnetic field generated by neodymium magnets can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also destroy videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

 Maintain neodymium magnets away from children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. 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.

Never bring neodymium magnets close to a phone and GPS.

Neodymium magnets generate intense magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.

In the situation of holding a finger in the path of a neodymium magnet, in such a case, a cut or even a fracture may occur.

Keep neodymium magnets away from people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

Neodymium magnetic are particularly delicate, which leads to their breakage.

Neodymium magnetic are highly delicate, and by joining them in an uncontrolled manner, they will crack. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. At the moment of connection between the magnets, sharp metal fragments can be dispersed in different directions.

Neodymium magnets are among the most powerful magnets on Earth. The surprising force they generate between each other can shock you.

Familiarize yourself with our information to correctly handle these magnets and avoid significant injuries to your body and prevent disruption to the magnets.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

Safety rules!

To show why neodymium magnets are so dangerous, read the article - How dangerous are strong neodymium magnets?.

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tel: +48 888 99 98 98