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MPL 30x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020140

GTIN/EAN: 5906301811466

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

6.75 g

Magnetization Direction

↑ axial

Load capacity

2.11 kg / 20.69 N

Magnetic Induction

115.11 mT / 1151 Gs

Coating

[NiCuNi] Nickel

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3.89 ZŁ with VAT / pcs + price for transport

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Technical parameters - MPL 30x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020140
GTIN/EAN 5906301811466
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 15 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 6.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.11 kg / 20.69 N
Magnetic Induction ~ ? 115.11 mT / 1151 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x2 / 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 product - technical parameters

Presented information are the direct effect of a physical calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these calculations as a reference point during assembly planning.

Table 1: Static force (force vs distance) - power drop
MPL 30x15x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1151 Gs
115.1 mT
 2.11 kg / 4.65 LBS
2110.0 g / 20.7 N
 strong
1 mm 1098 Gs
109.8 mT
 1.92 kg / 4.23 LBS
1920.5 g / 18.8 N
 weak grip
2 mm 1019 Gs
101.9 mT
 1.65 kg / 3.65 LBS
1654.9 g / 16.2 N
 weak grip
3 mm 926 Gs
92.6 mT
 1.37 kg / 3.01 LBS
1365.9 g / 13.4 N
 weak grip
5 mm 733 Gs
73.3 mT
 0.86 kg / 1.89 LBS
855.2 g / 8.4 N
 weak grip
10 mm 379 Gs
37.9 mT
 0.23 kg / 0.50 LBS
228.8 g / 2.2 N
 weak grip
15 mm 203 Gs
20.3 mT
 0.07 kg / 0.14 LBS
65.6 g / 0.6 N
 weak grip
20 mm 116 Gs
11.6 mT
 0.02 kg / 0.05 LBS
21.6 g / 0.2 N
 weak grip
30 mm 46 Gs
4.6 mT
 0.00 kg / 0.01 LBS
3.4 g / 0.0 N
 weak grip
50 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 weak grip
Magnetic force decreases significantly with every mm of distance. Note that even a very thin break (e.g., contamination, paint, dust) strongly reduces the pull force. Magnetic products work most effectively during direct contact; gap kills the power. Observe how quickly the parameters plummet, when the product does not touch tightly to the steel surface. When calculating the arrangement, discard additional spacers.

Table 2: Slippage force (vertical surface)
MPL 30x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.42 kg / 0.93 LBS
422.0 g / 4.1 N
1 mm Stal (~0.2) 0.38 kg / 0.85 LBS
384.0 g / 3.8 N
2 mm Stal (~0.2) 0.33 kg / 0.73 LBS
330.0 g / 3.2 N
3 mm Stal (~0.2) 0.27 kg / 0.60 LBS
274.0 g / 2.7 N
5 mm Stal (~0.2) 0.17 kg / 0.38 LBS
172.0 g / 1.7 N
10 mm Stal (~0.2) 0.05 kg / 0.10 LBS
46.0 g / 0.5 N
15 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data defines the estimated force required to cause the sliding of the magnet down along a vertical steel wall (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 30x15x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.63 kg / 1.40 LBS
633.0 g / 6.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.42 kg / 0.93 LBS
422.0 g / 4.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.21 kg / 0.47 LBS
211.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.06 kg / 2.33 LBS
1055.0 g / 10.3 N
When mounting a magnet on a vertical wall (e.g., a board), it you can count on only approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient influence the fact that products move down easier than they pop off the substrate. Designing a vertical fastening? Note that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will slide down under a significantly smaller weight. Application of an anti-slip layer can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 30x15x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.21 kg / 0.47 LBS
211.0 g / 2.1 N
1 mm
25%
 0.53 kg / 1.16 LBS
527.5 g / 5.2 N
2 mm
50%
 1.06 kg / 2.33 LBS
1055.0 g / 10.3 N
3 mm
75%
 1.58 kg / 3.49 LBS
1582.5 g / 15.5 N
5 mm
100%
 2.11 kg / 4.65 LBS
2110.0 g / 20.7 N
10 mm
100%
 2.11 kg / 4.65 LBS
2110.0 g / 20.7 N
11 mm
100%
 2.11 kg / 4.65 LBS
2110.0 g / 20.7 N
12 mm
100%
 2.11 kg / 4.65 LBS
2110.0 g / 20.7 N
A thin sheet is unable to take in the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To achieve 100% of this magnet's potential, you require a sufficiently solid piece of metal. The saturation effect causes that on thin elements (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 30x15x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.11 kg / 4.65 LBS
2110.0 g / 20.7 N
 OK
40 °C -2.2% 2.06 kg / 4.55 LBS
2063.6 g / 20.2 N
 OK
60 °C -4.4% 2.02 kg / 4.45 LBS
2017.2 g / 19.8 N
80 °C -6.6% 1.97 kg / 4.34 LBS
1970.7 g / 19.3 N
100 °C -28.8% 1.50 kg / 3.31 LBS
1502.3 g / 14.7 N
Ordinary NdFeB products change their properties parameters after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly demagnetize this product. As the temperature rises, the magnet's force momentarily drops. Refrain from using this product near heat sources exceeding its safe range. Too high temperature will cause permanent loss of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x15x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.67 kg / 8.10 LBS
2 169 Gs
0.55 kg / 1.22 LBS
551 g / 5.4 N
 N/A
1 mm 3.53 kg / 7.79 LBS
2 257 Gs
0.53 kg / 1.17 LBS
530 g / 5.2 N
 3.18 kg / 7.01 LBS
~0 Gs
2 mm 3.34 kg / 7.37 LBS
2 196 Gs
0.50 kg / 1.11 LBS
502 g / 4.9 N
 3.01 kg / 6.64 LBS
~0 Gs
3 mm 3.12 kg / 6.89 LBS
2 122 Gs
0.47 kg / 1.03 LBS
469 g / 4.6 N
 2.81 kg / 6.20 LBS
~0 Gs
5 mm 2.63 kg / 5.80 LBS
1 948 Gs
0.39 kg / 0.87 LBS
395 g / 3.9 N
 2.37 kg / 5.22 LBS
~0 Gs
10 mm 1.49 kg / 3.28 LBS
1 465 Gs
0.22 kg / 0.49 LBS
223 g / 2.2 N
 1.34 kg / 2.96 LBS
~0 Gs
20 mm 0.40 kg / 0.88 LBS
758 Gs
0.06 kg / 0.13 LBS
60 g / 0.6 N
 0.36 kg / 0.79 LBS
~0 Gs
50 mm 0.01 kg / 0.03 LBS
142 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
60 mm 0.01 kg / 0.01 LBS
92 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.01 LBS
63 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
44 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
32 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
24 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a further horizon of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Important: Results demonstrate shear force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
MPL 30x15x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a serious hazard to electronics as well as medical implants. These magnets generate a flux that destroys function of digital equipment. Remember: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MPL 30x15x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.00 km/h
(5.28 m/s)
 0.09 J
30 mm 30.91 km/h
(8.59 m/s)
 0.25 J
50 mm 39.87 km/h
(11.08 m/s)
 0.41 J
100 mm 56.39 km/h
(15.66 m/s)
 0.83 J
Magnetic elements are very brittle – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can trigger coating fragments or injury to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 30x15x2 / 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 30x15x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 236 Mx 62.4 µWb
Pc Coefficient 0.13 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 30x15x2 / N38

Environment Effective steel pull Effect
Air (land) 2.11 kg Standard
Water (riverbed) 2.42 kg
(+0.31 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.

3. Thermal stability

*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) = 0.13

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: 020140-2026
Magnet Unit Converter
Pulling force
Magnetic Induction
Input data in any box, to see the rest change on the fly.

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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 30x15x2 mm and a weight of 6.75 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 2.11 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. To separate the MPL 30x15x2 / 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 wind 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. 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 clean and degrease 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 (30x15 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 30x15x2 mm, which, at a weight of 6.75 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 30x15x2 mm and a self-weight of 6.75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose strength, even after around ten years – the decrease in power is only ~1% (based on measurements),
  • Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by external interference,
  • Thanks to the shiny finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
  • Magnets possess maximum magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the possibility of precise molding and adaptation to specialized solutions, NdFeB magnets can be manufactured in a broad palette of shapes and sizes, which increases their versatility,
  • Key role in advanced technology sectors – they find application in computer drives, electromotive mechanisms, medical devices, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mount.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products are able to complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what affects it?

Magnet power was determined for optimal configuration, taking into account:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • under axial force direction (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Real force impacted by working environment parameters, including (from priority):
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Beware of splinters

NdFeB magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them shattering into shards.

Physical harm

Big blocks can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Implant safety

Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Danger to the youngest

Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are very dangerous.

Cards and drives

Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Fire warning

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Do not underestimate power

Handle magnets with awareness. Their immense force can surprise even experienced users. Be vigilant and respect their power.

Threat to navigation

Be aware: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Do not overheat magnets

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Allergy Warning

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease working with magnets and wear gloves.

Safety First! Learn more about hazards in the article: Magnet Safety Guide.