MPL 25x15x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020392
GTIN/EAN: 5906301811893
length
25 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
5.63 g
Magnetization Direction
↑ axial
Load capacity
1.89 kg / 18.53 N
Magnetic Induction
120.03 mT / 1200 Gs
Coating
[NiCuNi] Nickel
2.39 ZŁ with VAT / pcs + price for transport
1.940 ZŁ net + 23% VAT / pcs
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Detailed specification - MPL 25x15x2 / N38 - lamellar magnet
Specification / characteristics - MPL 25x15x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020392 |
| GTIN/EAN | 5906301811893 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 25 mm [±0,1 mm] |
| Width | 15 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 5.63 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.89 kg / 18.53 N |
| Magnetic Induction ~ ? | 120.03 mT / 1200 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| 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
| properties | values | units |
|---|---|---|
| Vickers hardness | ≥550 | Hv |
| Density | ≥7.4 | g/cm3 |
| Curie Temperature TC | 312 - 380 | °C |
| Curie Temperature TF | 593 - 716 | °F |
| Specific resistance | 150 | μΩ⋅cm |
| Bending strength | 250 | MPa |
| Compressive strength | 1000~1100 | MPa |
| Thermal expansion parallel (∥) to orientation (M) | (3-4) x 10-6 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Technical modeling of the product - data
These information represent the outcome of a engineering analysis. Values are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide when designing systems.
Table 1: Static force (force vs distance) - interaction chart
MPL 25x15x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1200 Gs
120.0 mT
|
1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
|
weak grip |
| 1 mm |
1144 Gs
114.4 mT
|
1.72 kg / 3.79 lbs
1717.6 g / 16.8 N
|
weak grip |
| 2 mm |
1060 Gs
106.0 mT
|
1.48 kg / 3.25 lbs
1475.6 g / 14.5 N
|
weak grip |
| 3 mm |
961 Gs
96.1 mT
|
1.21 kg / 2.67 lbs
1212.1 g / 11.9 N
|
weak grip |
| 5 mm |
754 Gs
75.4 mT
|
0.75 kg / 1.65 lbs
746.8 g / 7.3 N
|
weak grip |
| 10 mm |
376 Gs
37.6 mT
|
0.19 kg / 0.41 lbs
185.6 g / 1.8 N
|
weak grip |
| 15 mm |
193 Gs
19.3 mT
|
0.05 kg / 0.11 lbs
48.9 g / 0.5 N
|
weak grip |
| 20 mm |
107 Gs
10.7 mT
|
0.02 kg / 0.03 lbs
15.0 g / 0.1 N
|
weak grip |
| 30 mm |
41 Gs
4.1 mT
|
0.00 kg / 0.00 lbs
2.2 g / 0.0 N
|
weak grip |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
weak grip |
Table 2: Sliding load (wall)
MPL 25x15x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.38 kg / 0.83 lbs
378.0 g / 3.7 N
|
| 1 mm | Stal (~0.2) |
0.34 kg / 0.76 lbs
344.0 g / 3.4 N
|
| 2 mm | Stal (~0.2) |
0.30 kg / 0.65 lbs
296.0 g / 2.9 N
|
| 3 mm | Stal (~0.2) |
0.24 kg / 0.53 lbs
242.0 g / 2.4 N
|
| 5 mm | Stal (~0.2) |
0.15 kg / 0.33 lbs
150.0 g / 1.5 N
|
| 10 mm | Stal (~0.2) |
0.04 kg / 0.08 lbs
38.0 g / 0.4 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 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
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 25x15x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.57 kg / 1.25 lbs
567.0 g / 5.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.38 kg / 0.83 lbs
378.0 g / 3.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.19 kg / 0.42 lbs
189.0 g / 1.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.95 kg / 2.08 lbs
945.0 g / 9.3 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MPL 25x15x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.19 kg / 0.42 lbs
189.0 g / 1.9 N
|
| 1 mm |
|
0.47 kg / 1.04 lbs
472.5 g / 4.6 N
|
| 2 mm |
|
0.95 kg / 2.08 lbs
945.0 g / 9.3 N
|
| 3 mm |
|
1.42 kg / 3.13 lbs
1417.5 g / 13.9 N
|
| 5 mm |
|
1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
|
| 10 mm |
|
1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
|
| 11 mm |
|
1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
|
| 12 mm |
|
1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
|
Table 5: Thermal resistance (stability) - thermal limit
MPL 25x15x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
|
OK |
| 40 °C | -2.2% |
1.85 kg / 4.08 lbs
1848.4 g / 18.1 N
|
OK |
| 60 °C | -4.4% |
1.81 kg / 3.98 lbs
1806.8 g / 17.7 N
|
|
| 80 °C | -6.6% |
1.77 kg / 3.89 lbs
1765.3 g / 17.3 N
|
|
| 100 °C | -28.8% |
1.35 kg / 2.97 lbs
1345.7 g / 13.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 25x15x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.33 kg / 7.34 lbs
2 260 Gs
|
0.50 kg / 1.10 lbs
499 g / 4.9 N
|
N/A |
| 1 mm |
3.20 kg / 7.05 lbs
2 353 Gs
|
0.48 kg / 1.06 lbs
480 g / 4.7 N
|
2.88 kg / 6.35 lbs
~0 Gs
|
| 2 mm |
3.03 kg / 6.67 lbs
2 288 Gs
|
0.45 kg / 1.00 lbs
454 g / 4.5 N
|
2.72 kg / 6.00 lbs
~0 Gs
|
| 3 mm |
2.82 kg / 6.22 lbs
2 210 Gs
|
0.42 kg / 0.93 lbs
423 g / 4.2 N
|
2.54 kg / 5.60 lbs
~0 Gs
|
| 5 mm |
2.37 kg / 5.22 lbs
2 024 Gs
|
0.36 kg / 0.78 lbs
355 g / 3.5 N
|
2.13 kg / 4.70 lbs
~0 Gs
|
| 10 mm |
1.32 kg / 2.90 lbs
1 509 Gs
|
0.20 kg / 0.44 lbs
197 g / 1.9 N
|
1.18 kg / 2.61 lbs
~0 Gs
|
| 20 mm |
0.33 kg / 0.72 lbs
752 Gs
|
0.05 kg / 0.11 lbs
49 g / 0.5 N
|
0.29 kg / 0.65 lbs
~0 Gs
|
| 50 mm |
0.01 kg / 0.02 lbs
128 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.01 lbs
81 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 / 0.00 lbs
54 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
38 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
28 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
21 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
MPL 25x15x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.5 cm |
| Car key | 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 |
Table 8: Collisions (cracking risk) - warning
MPL 25x15x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.58 km/h
(5.44 m/s)
|
0.08 J | |
| 30 mm |
32.03 km/h
(8.90 m/s)
|
0.22 J | |
| 50 mm |
41.32 km/h
(11.48 m/s)
|
0.37 J | |
| 100 mm |
58.43 km/h
(16.23 m/s)
|
0.74 J |
Table 9: Anti-corrosion coating durability
MPL 25x15x2 / 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) |
Table 10: Electrical data (Pc)
MPL 25x15x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 600 Mx | 56.0 µWb |
| Pc Coefficient | 0.14 | Low (Flat) |
Table 11: Submerged application
MPL 25x15x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.89 kg | Standard |
| Water (riverbed) |
2.16 kg
(+0.27 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical surface, the magnet retains just ~20% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) drastically limits the holding force.
3. Temperature resistance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14
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.
Material specification
| 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 |
Other proposals
Advantages as well as disadvantages of neodymium magnets.
Pros
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They feature excellent resistance to magnetic field loss when exposed to external fields,
- A magnet with a shiny gold surface has better aesthetics,
- They show high magnetic induction at the operating surface, which improves attraction properties,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Considering the ability of free forming and adaptation to unique solutions, NdFeB magnets can be created in a broad palette of geometric configurations, which expands the range of possible applications,
- Wide application in high-tech industry – they find application in hard drives, brushless drives, diagnostic systems, and technologically advanced constructions.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Limited ability of making threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
- With large orders the cost of neodymium magnets is a challenge,
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what it depends on?
- on a base made of structural steel, perfectly concentrating the magnetic field
- whose transverse dimension equals approx. 10 mm
- with a surface perfectly flat
- without the slightest insulating layer between the magnet and steel
- during pulling in a direction vertical to the plane
- at temperature approx. 20 degrees Celsius
Key elements affecting lifting force
- Space between magnet and steel – 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 reached only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – too thin sheet causes magnetic saturation, causing part of the power to be wasted to the other side.
- Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
- Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
- Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.
Safety rules for work with NdFeB magnets
Avoid contact if allergic
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness happens, immediately stop working with magnets and wear gloves.
Warning for heart patients
For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.
Keep away from computers
Device Safety: Strong magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
GPS Danger
Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.
Combustion hazard
Machining of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Danger to the youngest
Neodymium magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a critical condition and necessitates urgent medical intervention.
Safe operation
Handle with care. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can move away.
Material brittleness
Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Bone fractures
Danger of trauma: The attraction force is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.
Maximum temperature
Avoid heat. NdFeB magnets are susceptible to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).
