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MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020159

GTIN/EAN: 5906301811657

5.00

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

24 g

Magnetization Direction

↑ axial

Load capacity

7.52 kg / 73.80 N

Magnetic Induction

168.28 mT / 1683 Gs

Coating

[NiCuNi] Nickel

check technical data »

17.96 ZŁ with VAT / pcs + price for transport

14.60 ZŁ net + 23% VAT / pcs

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Product card - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020159
GTIN/EAN 5906301811657
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 40 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 24 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.52 kg / 73.80 N
Magnetic Induction ~ ? 168.28 mT / 1683 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
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 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Technical modeling of the product - data

These values represent the outcome of a engineering analysis. Results rely on algorithms for the class Nd2Fe14B. Operational performance may differ. Use these data as a reference point when designing systems.

Table 1: Static force (force vs gap) - characteristics
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1683 Gs
168.3 mT
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
 medium risk
1 mm 1613 Gs
161.3 mT
 6.91 kg / 15.24 LBS
6913.8 g / 67.8 N
 medium risk
2 mm 1524 Gs
152.4 mT
 6.17 kg / 13.61 LBS
6172.9 g / 60.6 N
 medium risk
3 mm 1423 Gs
142.3 mT
 5.38 kg / 11.86 LBS
5379.4 g / 52.8 N
 medium risk
5 mm 1207 Gs
120.7 mT
 3.87 kg / 8.53 LBS
3869.8 g / 38.0 N
 medium risk
10 mm 744 Gs
74.4 mT
 1.47 kg / 3.24 LBS
1469.3 g / 14.4 N
 weak grip
15 mm 455 Gs
45.5 mT
 0.55 kg / 1.21 LBS
550.7 g / 5.4 N
 weak grip
20 mm 288 Gs
28.8 mT
 0.22 kg / 0.49 LBS
220.3 g / 2.2 N
 weak grip
30 mm 129 Gs
12.9 mT
 0.04 kg / 0.10 LBS
44.4 g / 0.4 N
 weak grip
50 mm 38 Gs
3.8 mT
 0.00 kg / 0.01 LBS
3.8 g / 0.0 N
 weak grip
Magnetic force drops sharply with every mm of spacing. Remember that even a microscopic distance (e.g., dirt, paint, rust) significantly reduces the pull force. Magnets operate most effectively at the point of direct contact; distance weakens the power. Observe how flashily the pull force fall, when the magnet does not touch tightly to the steel surface. When calculating the arrangement, avoid unnecessary gaps.

Table 2: Slippage hold (vertical surface)
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
1 mm Stal (~0.2) 1.38 kg / 3.05 LBS
1382.0 g / 13.6 N
2 mm Stal (~0.2) 1.23 kg / 2.72 LBS
1234.0 g / 12.1 N
3 mm Stal (~0.2) 1.08 kg / 2.37 LBS
1076.0 g / 10.6 N
5 mm Stal (~0.2) 0.77 kg / 1.71 LBS
774.0 g / 7.6 N
10 mm Stal (~0.2) 0.29 kg / 0.65 LBS
294.0 g / 2.9 N
15 mm Stal (~0.2) 0.11 kg / 0.24 LBS
110.0 g / 1.1 N
20 mm Stal (~0.2) 0.04 kg / 0.10 LBS
44.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data shows the estimated holding capacity needed to initiate the sliding of the magnet down along a upright metal surface (assuming typical friction coefficient). This value is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 40x20x4x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.26 kg / 4.97 LBS
2256.0 g / 22.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.75 kg / 1.66 LBS
752.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.76 kg / 8.29 LBS
3760.0 g / 36.9 N
When hanging a element on a vertical surface (e.g., a board), it will maintain only approx. 1/5 of its maximum pull force. Gravity as well as a weak degree of grip cause that holders slide down easier than they pop off the substrate. Planning a wall mount? Consider that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slide down under a noticeably lighter cargo. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
MPL 40x20x4x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.75 kg / 1.66 LBS
752.0 g / 7.4 N
1 mm
25%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
2 mm
50%
 3.76 kg / 8.29 LBS
3760.0 g / 36.9 N
3 mm
75%
 5.64 kg / 12.43 LBS
5640.0 g / 55.3 N
5 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
10 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
11 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
12 mm
100%
 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
A thin sheet is not enough to take in the entire magnetic field, which squanders power of the holder. Should you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., car bodies), the magnet works worse. We advise picking the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MPL 40x20x4x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.52 kg / 16.58 LBS
7520.0 g / 73.8 N
 OK
40 °C -2.2% 7.35 kg / 16.21 LBS
7354.6 g / 72.1 N
 OK
60 °C -4.4% 7.19 kg / 15.85 LBS
7189.1 g / 70.5 N
80 °C -6.6% 7.02 kg / 15.48 LBS
7023.7 g / 68.9 N
100 °C -28.8% 5.35 kg / 11.80 LBS
5354.2 g / 52.5 N
Ordinary NdFeB products lose parameters past the thermal threshold. Watch out for overheating – high temperature can irreversibly demagnetize this product. As the temperature rises, the neodymium's power momentarily lowers. Refrain from using this product near heat sources exceeding its safe range. Too high temperature will cause irreversible degradation of magnetism.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MPL 40x20x4x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.96 kg / 30.78 LBS
2 997 Gs
2.09 kg / 4.62 LBS
2094 g / 20.5 N
 N/A
1 mm 13.44 kg / 29.64 LBS
3 302 Gs
2.02 kg / 4.45 LBS
2017 g / 19.8 N
 12.10 kg / 26.68 LBS
~0 Gs
2 mm 12.84 kg / 28.30 LBS
3 227 Gs
1.93 kg / 4.25 LBS
1926 g / 18.9 N
 11.55 kg / 25.47 LBS
~0 Gs
3 mm 12.17 kg / 26.83 LBS
3 142 Gs
1.83 kg / 4.02 LBS
1826 g / 17.9 N
 10.95 kg / 24.15 LBS
~0 Gs
5 mm 10.73 kg / 23.65 LBS
2 950 Gs
1.61 kg / 3.55 LBS
1609 g / 15.8 N
 9.66 kg / 21.29 LBS
~0 Gs
10 mm 7.19 kg / 15.84 LBS
2 414 Gs
1.08 kg / 2.38 LBS
1078 g / 10.6 N
 6.47 kg / 14.26 LBS
~0 Gs
20 mm 2.73 kg / 6.01 LBS
1 487 Gs
0.41 kg / 0.90 LBS
409 g / 4.0 N
 2.46 kg / 5.41 LBS
~0 Gs
50 mm 0.18 kg / 0.39 LBS
379 Gs
0.03 kg / 0.06 LBS
27 g / 0.3 N
 0.16 kg / 0.35 LBS
~0 Gs
60 mm 0.08 kg / 0.18 LBS
259 Gs
0.01 kg / 0.03 LBS
12 g / 0.1 N
 0.07 kg / 0.16 LBS
~0 Gs
70 mm 0.04 kg / 0.09 LBS
183 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
80 mm 0.02 kg / 0.05 LBS
133 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
90 mm 0.01 kg / 0.03 LBS
99 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
100 mm 0.01 kg / 0.02 LBS
76 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a larger range of action. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the impact force is extreme. The levitation is slightly lower than the attraction, but still significant.
*The magnetic induction between like poles drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
Attention: Estimates apply to shear force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MPL 40x20x4x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Car key 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field is a serious hazard to IT equipment and pacemakers. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Notice: the unseen radiation acts through matter and glass. Exceptional care must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MPL 40x20x4x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.91 km/h
(5.53 m/s)
 0.37 J
30 mm 31.03 km/h
(8.62 m/s)
 0.89 J
50 mm 39.93 km/h
(11.09 m/s)
 1.48 J
100 mm 56.45 km/h
(15.68 m/s)
 2.95 J
NdFeB products are delicate – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can cause material chips or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 40x20x4x2[7/3.5] / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MPL 40x20x4x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 15 299 Mx 153.0 µWb
Pc Coefficient 0.19 Low (Flat)
Flux value passing through the pole surface. Key data for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 40x20x4x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 7.52 kg Standard
Water (riverbed) 8.61 kg
(+1.09 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Sliding resistance

*Note: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.19

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
Chemical composition
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Ecology and recycling (GPSR)
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020159-2026
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Component MPL 40x20x4x2[7/3.5] / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 7.52 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. Watch your fingers! Magnets with a force of 7.52 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 7.52 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x20x4x2[7/3.5] / N38 model is magnetized through the thickness (dimension 4 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x20 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x20x4 mm, which, at a weight of 24 g, makes it an element with high energy density. It is a magnetic block with dimensions 40x20x4 mm and a self-weight of 24 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Apart from their strong holding force, neodymium magnets have these key benefits:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (according to research),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By using a lustrous coating of gold, the element acquires an professional look,
  • Neodymium magnets create maximum magnetic induction on a small surface, which increases force concentration,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to the option of precise shaping and adaptation to specialized projects, magnetic components can be produced in a wide range of geometric configurations, which expands the range of possible applications,
  • Versatile presence in modern industrial fields – they are commonly used in HDD drives, electromotive mechanisms, diagnostic systems, as well as multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Limitations

What to avoid - cons of neodymium magnets and ways of using them
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small components of these products can complicate diagnosis 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 increases costs of application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The specified lifting capacity represents the maximum value, recorded under laboratory conditions, meaning:
  • using a base made of low-carbon steel, serving as a circuit closing element
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

It is worth knowing that the working load may be lower subject to elements below, in order of importance:
  • Distance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was determined with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Keep away from children

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store out of reach of kids and pets.

Heat warning

Keep cool. NdFeB magnets are sensitive to heat. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Phone sensors

Navigation devices and smartphones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Handling guide

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Risk of cracking

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Pacemakers

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Serious injuries

Pinching hazard: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Nickel coating and allergies

Certain individuals have a sensitization to Ni, which is the common plating for NdFeB magnets. Extended handling can result in a rash. It is best to wear protective gloves.

Protect data

Do not bring magnets near a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Dust explosion hazard

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Important! Learn more about risks in the article: Safety of working with magnets.