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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Technical data of the product - 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 magnet - report
The following values represent the outcome of a physical calculation. Results were calculated on models for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - power drop
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 force (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: Vertical assembly (shearing) - vertical pull
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: Working in heat (stability) - power drop
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 (attraction) - field range
MPL 25x15x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (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: Hazards (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 |
| Phone / Smartphone | 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 |
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. Vertical hold
*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. computer case) severely limits the holding force.
3. Thermal stability
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths as well as weaknesses of neodymium magnets.
Advantages
- They do not lose magnetism, even over approximately ten years – the reduction in power is only ~1% (theoretically),
- Magnets effectively defend themselves against demagnetization caused by foreign field sources,
- By using a lustrous layer of silver, the element acquires an aesthetic look,
- Magnetic induction on the surface of the magnet remains strong,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
- Possibility of custom creating and adjusting to defined applications,
- Versatile presence in modern technologies – they are commonly used in HDD drives, electromotive mechanisms, medical equipment, as well as complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Disadvantages
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
- Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities
Pull force analysis
Best holding force of the magnet in ideal parameters – what it depends on?
- using a sheet made of low-carbon steel, functioning as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- characterized by even structure
- under conditions of no distance (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- at ambient temperature approx. 20 degrees Celsius
Practical lifting capacity: influencing factors
- Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
- Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.
Safe handling of neodymium magnets
Metal Allergy
Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact and opt for encased magnets.
Mechanical processing
Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
Thermal limits
Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.
Danger to the youngest
NdFeB magnets are not suitable for play. Swallowing several magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.
Bodily injuries
Big blocks can crush fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.
Handling rules
Be careful. Rare earth magnets attract from a long distance and connect with huge force, often faster than you can move away.
Magnetic interference
Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, device, and GPS.
Electronic hazard
Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).
Life threat
Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Magnet fragility
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
