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MPL 30x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020143

GTIN/EAN: 5906301811497

5.00
Load capacity 8.86 kg / 86.90 N Magnetic Induction 220.03 mT / 2200 Gs
length
30 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
22.5 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product specifications »

7.40 zł net / pcs

9.10 zł with VAT (23% VAT) / pcs

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Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Product card - MPL 30x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020143
GTIN/EAN 5906301811497
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 30 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 22.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.86 kg / 86.90 N
Magnetic Induction ~ ? 220.03 mT / 2200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x5 / N38 - lamellar magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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

Physical analysis of the product - technical parameters

Presented information are the direct effect of a engineering analysis. Results were calculated on models for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 30x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2200 Gs
220.0 mT
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
 strong
1 mm 2092 Gs
209.2 mT
 8.01 kg / 17.67 lbs
8013.9 g / 78.6 N
 strong
2 mm 1961 Gs
196.1 mT
 7.04 kg / 15.53 lbs
7042.1 g / 69.1 N
 strong
3 mm 1817 Gs
181.7 mT
 6.04 kg / 13.32 lbs
6041.8 g / 59.3 N
 strong
5 mm 1516 Gs
151.6 mT
 4.21 kg / 9.28 lbs
4209.6 g / 41.3 N
 strong
10 mm 892 Gs
89.2 mT
 1.46 kg / 3.21 lbs
1456.2 g / 14.3 N
 low risk
15 mm 519 Gs
51.9 mT
 0.49 kg / 1.09 lbs
492.4 g / 4.8 N
 low risk
20 mm 313 Gs
31.3 mT
 0.18 kg / 0.40 lbs
179.8 g / 1.8 N
 low risk
30 mm 132 Gs
13.2 mT
 0.03 kg / 0.07 lbs
31.9 g / 0.3 N
 low risk
50 mm 37 Gs
3.7 mT
 0.00 kg / 0.01 lbs
2.5 g / 0.0 N
 low risk
Grip strength decreases drastically with every subsequent millimeter of distance. Remember that even a very thin break (e.g., dirt, varnish, dust) strongly reduces the pull force. Neodymiums operate most effectively during direct contact; gap weakens the power. See how quickly the parameters drop, when the magnet does not adhere tightly to the steel surface. When designing the mounting, avoid unnecessary gaps.

Table 2: Shear force (wall)
MPL 30x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.77 kg / 3.91 lbs
1772.0 g / 17.4 N
1 mm Stal (~0.2) 1.60 kg / 3.53 lbs
1602.0 g / 15.7 N
2 mm Stal (~0.2) 1.41 kg / 3.10 lbs
1408.0 g / 13.8 N
3 mm Stal (~0.2) 1.21 kg / 2.66 lbs
1208.0 g / 11.9 N
5 mm Stal (~0.2) 0.84 kg / 1.86 lbs
842.0 g / 8.3 N
10 mm Stal (~0.2) 0.29 kg / 0.64 lbs
292.0 g / 2.9 N
15 mm Stal (~0.2) 0.10 kg / 0.22 lbs
98.0 g / 1.0 N
20 mm Stal (~0.2) 0.04 kg / 0.08 lbs
36.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 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 force necessary to start the slippage of the magnet vertically against a vertical metal surface (considering typical friction). This parameter varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 30x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.66 kg / 5.86 lbs
2658.0 g / 26.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.77 kg / 3.91 lbs
1772.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.95 lbs
886.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
When placing a element on a vertical wall (e.g., a board), it will maintain barely approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient cause that holders slip easier than they detach. Want to create a wall mount? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will give way down under a much lighter weight. Application of an anti-slip layer can significantly improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
1 mm
25%
 2.22 kg / 4.88 lbs
2215.0 g / 21.7 N
2 mm
50%
 4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
3 mm
75%
 6.65 kg / 14.65 lbs
6645.0 g / 65.2 N
5 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
10 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
11 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
12 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
A thin sheet is unable to absorb the entire magnetic field, which weakens actual performance of the holder. Should you mount a strong magnet to a too thin substrate, the field will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's power, you need a suitably thick element of steel. The saturation effect causes that on delicate walls (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - resistance threshold
MPL 30x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
 OK
40 °C -2.2% 8.67 kg / 19.10 lbs
8665.1 g / 85.0 N
 OK
60 °C -4.4% 8.47 kg / 18.67 lbs
8470.2 g / 83.1 N
80 °C -6.6% 8.28 kg / 18.24 lbs
8275.2 g / 81.2 N
100 °C -28.8% 6.31 kg / 13.91 lbs
6308.3 g / 61.9 N
Ordinary NdFeB products change their properties power past the thermal threshold. Watch out for overheating – high temperature can irreversibly demagnetize this magnet. As the temperature rises, the magnet's force temporarily decreases. Do not use this magnet in hot environments exceeding its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 30x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.90 kg / 39.47 lbs
3 715 Gs
2.69 kg / 5.92 lbs
2685 g / 26.3 N
 N/A
1 mm 17.10 kg / 37.69 lbs
4 300 Gs
2.56 kg / 5.65 lbs
2565 g / 25.2 N
 15.39 kg / 33.92 lbs
~0 Gs
2 mm 16.19 kg / 35.70 lbs
4 184 Gs
2.43 kg / 5.35 lbs
2429 g / 23.8 N
 14.57 kg / 32.13 lbs
~0 Gs
3 mm 15.23 kg / 33.57 lbs
4 058 Gs
2.28 kg / 5.04 lbs
2284 g / 22.4 N
 13.71 kg / 30.22 lbs
~0 Gs
5 mm 13.22 kg / 29.14 lbs
3 780 Gs
1.98 kg / 4.37 lbs
1982 g / 19.4 N
 11.89 kg / 26.22 lbs
~0 Gs
10 mm 8.51 kg / 18.75 lbs
3 033 Gs
1.28 kg / 2.81 lbs
1276 g / 12.5 N
 7.66 kg / 16.88 lbs
~0 Gs
20 mm 2.94 kg / 6.49 lbs
1 784 Gs
0.44 kg / 0.97 lbs
441 g / 4.3 N
 2.65 kg / 5.84 lbs
~0 Gs
50 mm 0.15 kg / 0.32 lbs
398 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
60 mm 0.06 kg / 0.14 lbs
264 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
70 mm 0.03 kg / 0.07 lbs
183 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
80 mm 0.02 kg / 0.04 lbs
131 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
97 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
73 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums attract each other from a wider radius than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a larger range of action. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still large.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
Attention: Results show sliding force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MPL 30x20x5 / 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
Remote 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
Powerful magnet radiation is a serious hazard to electronics and pacemakers. These magnets produce a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MPL 30x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.78 km/h
(6.33 m/s)
 0.45 J
30 mm 24.40 km/h
(6.78 m/s)
 0.52 J
50 mm 24.45 km/h
(6.79 m/s)
 0.52 J
100 mm 24.46 km/h
(6.79 m/s)
 0.52 J
NdFeB products are very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with large magnets.

Table 9: Corrosion resistance
MPL 30x20x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MPL 30x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 969 Mx 149.7 µWb
Pc Coefficient 0.26 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter when building generators and motors. Pc value defines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 30x20x5 / N38

Environment Effective steel pull Effect
Air (land) 8.86 kg Standard
Water (riverbed) 10.14 kg
(+1.28 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Shear force

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Temperature resistance

*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) = 0.26

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.

Technical and environmental data

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: 020143-2026
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Model MPL 30x20x5 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 8.86 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 30x20x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 30x20x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for hanging tools 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (30x20 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 30x20x5 mm, which, at a weight of 22.5 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 8.86 kg (force ~86.90 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of neodymium magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • Magnets effectively protect themselves against loss of magnetization caused by ambient magnetic noise,
  • By applying a shiny layer of nickel, the element has an proper look,
  • Neodymium magnets create maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • Thanks to flexibility in constructing and the ability to adapt to individual projects,
  • Universal use in modern technologies – they are used in magnetic memories, brushless drives, advanced medical instruments, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

What to avoid - cons of neodymium magnets: tips and applications.
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing threads and complex shapes in magnets, we recommend using cover - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

Magnet power was determined for the most favorable conditions, assuming:
  • using a sheet made of low-carbon steel, acting as a circuit closing element
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • without any air gap between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

What influences lifting capacity in practice

Please note that the magnet holding will differ subject to the following factors, starting with the most relevant:
  • Distance (between the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be escaped to the other side.
  • Steel type – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal environment – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Adults only

Only for adults. Small elements can be swallowed, causing severe trauma. Keep out of reach of kids and pets.

Caution required

Handle magnets consciously. Their powerful strength can shock even professionals. Be vigilant and respect their force.

Implant safety

Individuals with a heart stimulator must maintain an large gap from magnets. The magnetism can interfere with the functioning of the life-saving device.

Heat warning

Do not overheat. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Fire risk

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Allergy Warning

It is widely known that the nickel plating (the usual finish) is a common allergen. If you have an allergy, refrain from direct skin contact or opt for encased magnets.

Keep away from computers

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

Bone fractures

Large magnets can break fingers in a fraction of a second. Never put your hand between two strong magnets.

Magnetic interference

A powerful magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Eye protection

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Danger! More info about hazards in the article: Magnet Safety Guide.