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MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020151

GTIN/EAN: 5906301811572

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

9.31 kg / 91.33 N

Magnetic Induction

275.57 mT / 2756 Gs

Coating

[NiCuNi] Nickel

technical parameters »

9.21 ZŁ with VAT / pcs + price for transport

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Parameters along with appearance of a neodymium magnet can be reviewed with our modular calculator.

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Technical parameters of the product - MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020151
GTIN/EAN 5906301811572
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 10 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.31 kg / 91.33 N
Magnetic Induction ~ ? 275.57 mT / 2756 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x4x2[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

Engineering analysis of the magnet - report

These data constitute the result of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Real-world performance might slightly differ. Use these calculations as a reference point for designers.

Table 1: Static force (pull vs distance) - power drop
MPL 40x10x4x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2755 Gs
275.5 mT
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
 strong
1 mm 2413 Gs
241.3 mT
 7.14 kg / 15.75 pounds
7143.1 g / 70.1 N
 strong
2 mm 2044 Gs
204.4 mT
 5.13 kg / 11.31 pounds
5128.9 g / 50.3 N
 strong
3 mm 1703 Gs
170.3 mT
 3.56 kg / 7.85 pounds
3559.5 g / 34.9 N
 strong
5 mm 1173 Gs
117.3 mT
 1.69 kg / 3.72 pounds
1688.2 g / 16.6 N
 safe
10 mm 522 Gs
52.2 mT
 0.33 kg / 0.74 pounds
334.9 g / 3.3 N
 safe
15 mm 277 Gs
27.7 mT
 0.09 kg / 0.21 pounds
94.2 g / 0.9 N
 safe
20 mm 163 Gs
16.3 mT
 0.03 kg / 0.07 pounds
32.8 g / 0.3 N
 safe
30 mm 69 Gs
6.9 mT
 0.01 kg / 0.01 pounds
5.8 g / 0.1 N
 safe
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 safe
Pulling power decreases drastically per each millimeter of gap. Remember that even the smallest gap (e.g., dirt, paint, rust) strongly reduces the pull force. Magnets hold optimally at the point of direct contact; distance weakens the power. Analyze how rapidly the parameters plummet, when the product does not touch flatly to the metal substrate. When planning the arrangement, avoid additional spacers.

Table 2: Sliding capacity (wall)
MPL 40x10x4x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
1 mm Stal (~0.2) 1.43 kg / 3.15 pounds
1428.0 g / 14.0 N
2 mm Stal (~0.2) 1.03 kg / 2.26 pounds
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.71 kg / 1.57 pounds
712.0 g / 7.0 N
5 mm Stal (~0.2) 0.34 kg / 0.75 pounds
338.0 g / 3.3 N
10 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below defines the approximate weight limit necessary to start the slippage of the magnet down against a vertical steel plate (assuming standard friction coefficient). This parameter varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 40x10x4x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.79 kg / 6.16 pounds
2793.0 g / 27.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.93 kg / 2.05 pounds
931.0 g / 9.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
When mounting a magnet on a upright wall (e.g., a car body), it you can count on just about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that products slide down faster than they pop off the substrate. Designing a hanger? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will slide down under a significantly smaller load. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MPL 40x10x4x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.93 kg / 2.05 pounds
931.0 g / 9.1 N
1 mm
25%
 2.33 kg / 5.13 pounds
2327.5 g / 22.8 N
2 mm
50%
 4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
3 mm
75%
 6.98 kg / 15.39 pounds
6982.5 g / 68.5 N
5 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
10 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
11 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
12 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
A too thin steel cannot conduct the entire magnetic field, which weakens actual performance of the holder. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To utilize the maximum of this neodymium's power, you need a suitably thick element of steel. The material oversaturation means that on delicate walls (e.g., car bodies), the holder holds weaker. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 40x10x4x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
 OK
40 °C -2.2% 9.11 kg / 20.07 pounds
9105.2 g / 89.3 N
 OK
60 °C -4.4% 8.90 kg / 19.62 pounds
8900.4 g / 87.3 N
80 °C -6.6% 8.70 kg / 19.17 pounds
8695.5 g / 85.3 N
100 °C -28.8% 6.63 kg / 14.61 pounds
6628.7 g / 65.0 N
Standard neodymium magnets lose power after exceeding the maximum temperature. Protect against heat – excessive heat can permanently damage this magnet. With increasing heat, the magnet's capacity temporarily drops. Refrain from using this magnet close to heaters higher than its operating temperature limit. Too high temperature will cause irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) may lose charge permanently sooner than taller cylinders. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x10x4x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.71 kg / 41.25 pounds
4 164 Gs
2.81 kg / 6.19 pounds
2807 g / 27.5 N
 N/A
1 mm 16.57 kg / 36.53 pounds
5 185 Gs
2.49 kg / 5.48 pounds
2486 g / 24.4 N
 14.91 kg / 32.88 pounds
~0 Gs
2 mm 14.36 kg / 31.65 pounds
4 826 Gs
2.15 kg / 4.75 pounds
2153 g / 21.1 N
 12.92 kg / 28.48 pounds
~0 Gs
3 mm 12.24 kg / 26.98 pounds
4 455 Gs
1.84 kg / 4.05 pounds
1836 g / 18.0 N
 11.01 kg / 24.28 pounds
~0 Gs
5 mm 8.61 kg / 18.98 pounds
3 737 Gs
1.29 kg / 2.85 pounds
1291 g / 12.7 N
 7.75 kg / 17.08 pounds
~0 Gs
10 mm 3.39 kg / 7.48 pounds
2 346 Gs
0.51 kg / 1.12 pounds
509 g / 5.0 N
 3.05 kg / 6.73 pounds
~0 Gs
20 mm 0.67 kg / 1.48 pounds
1 045 Gs
0.10 kg / 0.22 pounds
101 g / 1.0 N
 0.61 kg / 1.34 pounds
~0 Gs
50 mm 0.03 kg / 0.06 pounds
207 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
60 mm 0.01 kg / 0.03 pounds
138 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
70 mm 0.01 kg / 0.01 pounds
96 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
69 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
51 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
39 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a neodymium and metal setup. Such a system of two magnets generates a stronger field and a wider radius of action. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is extreme. The repulsion force is slightly lower than the connection force, but still large.
*Field value between like poles reaches ~0 Gs at the midpoint of the gap (due to field cancellation).
* Results apply to friction force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MPL 40x10x4x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field poses a real danger to electronic devices and medical implants. These NdFeB products produce a flux that disrupts operation of digital equipment. Notice: the unseen radiation penetrates the body and plastic. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MPL 40x10x4x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.72 km/h
(7.98 m/s)
 0.38 J
30 mm 48.67 km/h
(13.52 m/s)
 1.10 J
50 mm 62.82 km/h
(17.45 m/s)
 1.83 J
100 mm 88.83 km/h
(24.68 m/s)
 3.65 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when working with large magnets.

Table 9: Corrosion resistance
MPL 40x10x4x2[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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MPL 40x10x4x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 840 Mx 98.4 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value emitted by the magnet pole. Key data for generator designers as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 40x10x4x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 9.31 kg Standard
Water (riverbed) 10.66 kg
(+1.35 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.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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%
Environmental data
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: 020151-2026
Measurement Calculator
Magnet pull force
Field Strength
Type a value in one of the inputs, to see the rest will update automatically.

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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 40x10x4 mm and a weight of 12 g, guarantees the highest quality connection. As a block magnet with high power (approx. 9.31 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.
The key to success is shifting 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. To separate the MPL 40x10x4x2[7/3.5] / 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.
They constitute a key element in the production of generators and material handling systems. They work great as fasteners under tiles, wood, or glass. 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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 (40x10 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 4 mm (thickness). The key parameter here is the holding force amounting to approximately 9.31 kg (force ~91.33 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They retain their magnetic properties even under strong external field,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnets are characterized by impressive magnetic induction on the active area,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures approaching 230°C and above...
  • Possibility of accurate modeling as well as optimizing to individual needs,
  • Wide application in electronics industry – they find application in data components, motor assemblies, advanced medical instruments, also other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Characteristics of disadvantages 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.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of producing threads in the magnet and complicated shapes - recommended is a housing - 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 safety. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical after entering the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum lifting capacity of the magnet – what contributes to it?

Breakaway force was determined for ideal contact conditions, including:
  • with the use of a sheet made of special test steel, guaranteeing maximum field concentration
  • with a cross-section no less than 10 mm
  • with an ground touching surface
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Effective lifting capacity impacted by specific conditions, such as (from most important):
  • Clearance – existence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Crushing risk

Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.

No play value

Always keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are fatal.

Phone sensors

Navigation devices and smartphones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Powerful field

Handle magnets consciously. Their immense force can shock even professionals. Stay alert and respect their force.

Demagnetization risk

Do not overheat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Machining danger

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

ICD Warning

For implant holders: Powerful magnets disrupt medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Allergy Warning

Some people suffer from a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in dermatitis. We strongly advise wear protective gloves.

Risk of cracking

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them cracking into small pieces.

Electronic devices

Data protection: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

Warning! Details about hazards in the article: Magnet Safety Guide.