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MPL 25x25x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020137

GTIN/EAN: 5906301811435

5.00

length

25 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

46.88 g

Magnetization Direction

↑ axial

Load capacity

19.39 kg / 190.25 N

Magnetic Induction

361.04 mT / 3610 Gs

Coating

[NiCuNi] Nickel

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Technical details - MPL 25x25x10 / N38 - lamellar magnet

Specification / characteristics - MPL 25x25x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020137
GTIN/EAN 5906301811435
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 25 mm [±0,1 mm]
Width 25 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 46.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.39 kg / 190.25 N
Magnetic Induction ~ ? 361.04 mT / 3610 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x25x10 / 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 analysis of the assembly - report

Presented information are the outcome of a engineering simulation. Results are based on models for the class Nd2Fe14B. Actual performance may differ from theoretical values. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MPL 25x25x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3610 Gs
361.0 mT
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
 dangerous!
1 mm 3392 Gs
339.2 mT
 17.12 kg / 37.74 LBS
17117.7 g / 167.9 N
 dangerous!
2 mm 3156 Gs
315.6 mT
 14.82 kg / 32.68 LBS
14822.5 g / 145.4 N
 dangerous!
3 mm 2913 Gs
291.3 mT
 12.63 kg / 27.85 LBS
12631.8 g / 123.9 N
 dangerous!
5 mm 2436 Gs
243.6 mT
 8.83 kg / 19.46 LBS
8827.9 g / 86.6 N
 strong
10 mm 1464 Gs
146.4 mT
 3.19 kg / 7.04 LBS
3191.5 g / 31.3 N
 strong
15 mm 872 Gs
87.2 mT
 1.13 kg / 2.49 LBS
1131.5 g / 11.1 N
 safe
20 mm 538 Gs
53.8 mT
 0.43 kg / 0.95 LBS
430.4 g / 4.2 N
 safe
30 mm 234 Gs
23.4 mT
 0.08 kg / 0.18 LBS
81.8 g / 0.8 N
 safe
50 mm 68 Gs
6.8 mT
 0.01 kg / 0.02 LBS
6.9 g / 0.1 N
 safe
Grip strength weakens drastically with every mm of distance. Note that even a microscopic distance (e.g., contamination, paint, veneer) noticeably reduces the pull force. Magnets operate most effectively in perfect adhesion; air break drastically cuts the power. Notice how flashily the parameters fall, when the product does not touch flatly to the steel surface. When planning the mounting, discard redundant distances.

Table 2: Slippage capacity (vertical surface)
MPL 25x25x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.88 kg / 8.55 LBS
3878.0 g / 38.0 N
1 mm Stal (~0.2) 3.42 kg / 7.55 LBS
3424.0 g / 33.6 N
2 mm Stal (~0.2) 2.96 kg / 6.53 LBS
2964.0 g / 29.1 N
3 mm Stal (~0.2) 2.53 kg / 5.57 LBS
2526.0 g / 24.8 N
5 mm Stal (~0.2) 1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
10 mm Stal (~0.2) 0.64 kg / 1.41 LBS
638.0 g / 6.3 N
15 mm Stal (~0.2) 0.23 kg / 0.50 LBS
226.0 g / 2.2 N
20 mm Stal (~0.2) 0.09 kg / 0.19 LBS
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
This section shows the estimated holding capacity necessary to initiate the sliding of the magnet vertically on a upright metal surface (assuming typical friction). This value depends on the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 25x25x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.82 kg / 12.82 LBS
5817.0 g / 57.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.88 kg / 8.55 LBS
3878.0 g / 38.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.94 kg / 4.27 LBS
1939.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.70 kg / 21.37 LBS
9695.0 g / 95.1 N
When placing a holder on a upright plane (e.g., a board), it will maintain just about 1/5 of its nominal power. Gravity and a weak degree of grip mean that magnets slip easier than they detach. Want to create a vertical fastening? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will slip down under a much lighter weight. Application of an anti-slip coating can effectively improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 25x25x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.97 kg / 2.14 LBS
969.5 g / 9.5 N
1 mm
13%
 2.42 kg / 5.34 LBS
2423.8 g / 23.8 N
2 mm
25%
 4.85 kg / 10.69 LBS
4847.5 g / 47.6 N
3 mm
38%
 7.27 kg / 16.03 LBS
7271.3 g / 71.3 N
5 mm
63%
 12.12 kg / 26.72 LBS
12118.8 g / 118.9 N
10 mm
100%
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
11 mm
100%
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
12 mm
100%
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
A thin sheet cannot take in the entire magnetic field, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's potential, you require a sufficiently solid backing of metal. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the holder holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (stability) - power drop
MPL 25x25x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
 OK
40 °C -2.2% 18.96 kg / 41.81 LBS
18963.4 g / 186.0 N
 OK
60 °C -4.4% 18.54 kg / 40.87 LBS
18536.8 g / 181.8 N
80 °C -6.6% 18.11 kg / 39.93 LBS
18110.3 g / 177.7 N
100 °C -28.8% 13.81 kg / 30.44 LBS
13805.7 g / 135.4 N
Standard neodymium magnets lose strength past the thermal threshold. Avoid high temperatures – heat can permanently destroy this product. With increasing heat, the magnet's power temporarily lowers. Avoid using this product in hot environments exceeding its working range. Too high temperature will lead to destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 25x25x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 50.20 kg / 110.68 LBS
5 073 Gs
7.53 kg / 16.60 LBS
7531 g / 73.9 N
 N/A
1 mm 47.31 kg / 104.30 LBS
7 008 Gs
7.10 kg / 15.65 LBS
7097 g / 69.6 N
 42.58 kg / 93.87 LBS
~0 Gs
2 mm 44.32 kg / 97.71 LBS
6 783 Gs
6.65 kg / 14.66 LBS
6648 g / 65.2 N
 39.89 kg / 87.94 LBS
~0 Gs
3 mm 41.33 kg / 91.12 LBS
6 550 Gs
6.20 kg / 13.67 LBS
6200 g / 60.8 N
 37.20 kg / 82.01 LBS
~0 Gs
5 mm 35.49 kg / 78.25 LBS
6 070 Gs
5.32 kg / 11.74 LBS
5324 g / 52.2 N
 31.94 kg / 70.43 LBS
~0 Gs
10 mm 22.86 kg / 50.39 LBS
4 871 Gs
3.43 kg / 7.56 LBS
3429 g / 33.6 N
 20.57 kg / 45.35 LBS
~0 Gs
20 mm 8.26 kg / 18.22 LBS
2 929 Gs
1.24 kg / 2.73 LBS
1240 g / 12.2 N
 7.44 kg / 16.40 LBS
~0 Gs
50 mm 0.46 kg / 1.02 LBS
695 Gs
0.07 kg / 0.15 LBS
70 g / 0.7 N
 0.42 kg / 0.92 LBS
~0 Gs
60 mm 0.21 kg / 0.47 LBS
469 Gs
0.03 kg / 0.07 LBS
32 g / 0.3 N
 0.19 kg / 0.42 LBS
~0 Gs
70 mm 0.10 kg / 0.23 LBS
329 Gs
0.02 kg / 0.03 LBS
16 g / 0.2 N
 0.09 kg / 0.21 LBS
~0 Gs
80 mm 0.05 kg / 0.12 LBS
239 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
90 mm 0.03 kg / 0.07 LBS
178 Gs
0.00 kg / 0.01 LBS
5 g / 0.0 N
 0.03 kg / 0.06 LBS
~0 Gs
100 mm 0.02 kg / 0.04 LBS
136 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. The setup of two magnets produces a massive flux and a larger range of operation. Designing a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is huge. The levitation is marginally weaker than the attraction, but still large.
*Field value between like poles reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Results refer to friction force of two matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
MPL 25x25x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field poses a serious hazard to electronic devices and medical implants. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MPL 25x25x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.52 km/h
(6.26 m/s)
 0.92 J
30 mm 35.62 km/h
(9.89 m/s)
 2.29 J
50 mm 45.87 km/h
(12.74 m/s)
 3.81 J
100 mm 64.86 km/h
(18.02 m/s)
 7.61 J
Magnetic elements are delicate – a collision with steel causes immediate chipping. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit with great force 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: Surface protection spec
MPL 25x25x10 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 25x25x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 497 Mx 235.0 µWb
Pc Coefficient 0.46 Low (Flat)
Flux value emitted by the magnet pole. Key data in coil applications and motors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 25x25x10 / N38

Environment Effective steel pull Effect
Air (land) 19.39 kg Standard
Water (riverbed) 22.20 kg
(+2.81 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Sliding resistance

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

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC 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) = 0.46

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%
Sustainability
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: 020137-2026
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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 25x25x10 mm and a weight of 46.88 g, guarantees the highest quality connection. This magnetic block with a force of 190.25 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 25x25x10 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 25x25x10 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 19.39 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 25x25x10 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 25x25x10 / N38 model is magnetized axially (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 25x25x10 mm, which, at a weight of 46.88 g, makes it an element with high energy density. It is a magnetic block with dimensions 25x25x10 mm and a self-weight of 46.88 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of rare earth magnets.

Pros

Apart from their strong power, neodymium magnets have these key benefits:
  • They do not lose power, even during nearly 10 years – the decrease in strength is only ~1% (according to tests),
  • They are resistant to demagnetization induced by external magnetic fields,
  • By applying a decorative layer of nickel, the element acquires an elegant look,
  • Magnetic induction on the working layer of the magnet remains exceptional,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to the ability of flexible shaping and customization to unique projects, neodymium magnets can be manufactured in a broad palette of shapes and sizes, which makes them more universal,
  • Wide application in future technologies – they find application in mass storage devices, drive modules, medical devices, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in small systems

Limitations

What to avoid - cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. 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
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum holding power of the magnet – what it depends on?

Holding force of 19.39 kg is a theoretical maximum value executed under specific, ideal conditions:
  • using a base made of low-carbon steel, acting as a magnetic yoke
  • whose thickness equals approx. 10 mm
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • during detachment in a direction perpendicular to the plane
  • at standard ambient temperature

What influences lifting capacity in practice

In practice, the actual holding force is determined by several key aspects, presented from most significant:
  • Distance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Hardened steels may attract less.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Warnings
Sensitization to coating

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Magnetic interference

A powerful magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Maintain magnets near a device to prevent damaging the sensors.

Electronic hazard

Very strong magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Life threat

Patients with a pacemaker have to keep an large gap from magnets. The magnetism can stop the functioning of the implant.

Do not overheat magnets

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Fragile material

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Conscious usage

Use magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their force.

Swallowing risk

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are life-threatening.

Bone fractures

Big blocks can smash fingers instantly. Never place your hand betwixt two attracting surfaces.

Dust explosion hazard

Powder created during cutting of magnets is combustible. Do not drill into magnets unless you are an expert.

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