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MPL 30x20x4 / N38 - lamellar magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

lamellar magnet

Catalog no 020286

GTIN/EAN: 5906301811848

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

18 g

Magnetization Direction

↑ axial

Load capacity

6.30 kg / 61.84 N

Magnetic Induction

180.57 mT / 1806 Gs

Coating

[NiCuNi] Nickel

see parameters »

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Technical details - MPL 30x20x4 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x4 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020286
GTIN/EAN	5906301811848
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	20 mm [±0,1 mm]
Height	4 mm [±0,1 mm]
Weight	18 g
Magnetization Direction	↑ axial
Load capacity ~ ?	6.30 kg / 61.84 N
Magnetic Induction ~ ?	180.57 mT / 1806 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x4 / 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

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 modeling of the product - report

These information represent the outcome of a mathematical analysis. Values are based on models for the class Nd₂Fe₁₄B. Real-world conditions may deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MPL 30x20x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	1805 Gs 180.5 mT	6.30 kg / 6300.0 g 61.8 N	medium risk
1 mm	1728 Gs 172.8 mT	5.77 kg / 5771.5 g 56.6 N	medium risk
2 mm	1628 Gs 162.8 mT	5.13 kg / 5125.7 g 50.3 N	medium risk
3 mm	1515 Gs 151.5 mT	4.43 kg / 4434.6 g 43.5 N	medium risk
5 mm	1271 Gs 127.1 mT	3.12 kg / 3124.3 g 30.6 N	medium risk
10 mm	751 Gs 75.1 mT	1.09 kg / 1088.7 g 10.7 N	safe
15 mm	435 Gs 43.5 mT	0.37 kg / 366.3 g 3.6 N	safe
20 mm	262 Gs 26.2 mT	0.13 kg / 132.6 g 1.3 N	safe
30 mm	110 Gs 11.0 mT	0.02 kg / 23.2 g 0.2 N	safe
50 mm	30 Gs 3.0 mT	0.00 kg / 1.8 g 0.0 N	safe

Pulling power weakens drastically per each millimeter of distance. Keep in mind that even a very thin break (e.g., contamination, paint, veneer) strongly reduces the pull force. Neodymiums operate optimally at the point of direct contact; air break nullifies the power. Observe how rapidly the parameters fall, when the magnet does not touch tightly to the metal substrate. When calculating the arrangement, eliminate additional spacers.

Table 2: Shear capacity (vertical surface)
MPL 30x20x4 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.26 kg / 1260.0 g 12.4 N
1 mm	Stal (~0.2)	1.15 kg / 1154.0 g 11.3 N
2 mm	Stal (~0.2)	1.03 kg / 1026.0 g 10.1 N
3 mm	Stal (~0.2)	0.89 kg / 886.0 g 8.7 N
5 mm	Stal (~0.2)	0.62 kg / 624.0 g 6.1 N
10 mm	Stal (~0.2)	0.22 kg / 218.0 g 2.1 N
15 mm	Stal (~0.2)	0.07 kg / 74.0 g 0.7 N
20 mm	Stal (~0.2)	0.03 kg / 26.0 g 0.3 N
30 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below indicates the theoretical weight limit sufficient to cause the shifting of the magnet vertically against a vertical metal surface (considering typical friction). This value is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 30x20x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.89 kg / 1890.0 g 18.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.26 kg / 1260.0 g 12.4 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.63 kg / 630.0 g 6.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.15 kg / 3150.0 g 30.9 N

When mounting a holder on a upright wall (e.g., a fridge), it will maintain just about 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that holders move down easier than they pop off the substrate. Designing a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slide down under a noticeably lighter load. Application of an anti-slip layer can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x20x4 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.63 kg / 630.0 g 6.2 N
1 mm	25%	1.58 kg / 1575.0 g 15.5 N
2 mm	50%	3.15 kg / 3150.0 g 30.9 N
5 mm	100%	6.30 kg / 6300.0 g 61.8 N
10 mm	100%	6.30 kg / 6300.0 g 61.8 N

A too thin steel is incapable of focus the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the field will penetrate right through and the attraction force will be weaker. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid piece of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - resistance threshold
MPL 30x20x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	6.30 kg / 6300.0 g 61.8 N	OK
40 °C	-2.2%	6.16 kg / 6161.4 g 60.4 N	OK
60 °C	-4.4%	6.02 kg / 6022.8 g 59.1 N
80 °C	-6.6%	5.88 kg / 5884.2 g 57.7 N
100 °C	-28.8%	4.49 kg / 4485.6 g 44.0 N

Standard neodymium magnets irreversibly lose power above the temperature limit. Watch out for overheating – high temperature can irreversibly damage this product. As the temperature rises, the neodymium's force temporarily drops. Avoid using this product near heat sources higher than its working range. Exceeding the critical threshold will lead to destruction of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MPL 30x20x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	12.06 kg / 12057 g 118.3 N 3 198 Gs	N/A
1 mm	11.59 kg / 11591 g 113.7 N 3 540 Gs	10.43 kg / 10432 g 102.3 N ~0 Gs
2 mm	11.05 kg / 11046 g 108.4 N 3 456 Gs	9.94 kg / 9941 g 97.5 N ~0 Gs
3 mm	10.45 kg / 10446 g 102.5 N 3 361 Gs	9.40 kg / 9402 g 92.2 N ~0 Gs
5 mm	9.15 kg / 9152 g 89.8 N 3 146 Gs	8.24 kg / 8236 g 80.8 N ~0 Gs
10 mm	5.98 kg / 5979 g 58.7 N 2 543 Gs	5.38 kg / 5381 g 52.8 N ~0 Gs
20 mm	2.08 kg / 2084 g 20.4 N 1 501 Gs	1.88 kg / 1875 g 18.4 N ~0 Gs
50 mm	0.10 kg / 101 g 1.0 N 331 Gs	0.09 kg / 91 g 0.9 N ~0 Gs

Two magnetic products interact from a significantly greater distance than a magnet and steel combination. The connection of two magnets produces a massive flux and a wider radius of operation. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Field value between like poles reaches ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 30x20x4 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	10.0 cm
Hearing aid	10 Gs (1.0 mT)	7.5 cm
Mechanical watch	20 Gs (2.0 mT)	6.0 cm
Mobile device	40 Gs (4.0 mT)	4.5 cm
Car key	50 Gs (5.0 mT)	4.5 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

A strong magnetic field poses a serious hazard to electronics as well as pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MPL 30x20x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	20.81 km/h (5.78 m/s)	0.30 J
30 mm	32.75 km/h (9.10 m/s)	0.75 J
50 mm	42.20 km/h (11.72 m/s)	1.24 J
100 mm	59.66 km/h (16.57 m/s)	2.47 J

Neodymium magnets are prone to chipping – a collision with steel causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or painful pinches to skin. Hold the magnet firmly during bringing near metal 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 playing with large magnets.

Table 9: Anti-corrosion coating durability
MPL 30x20x4 / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 30x20x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	12 775 Mx	127.8 µWb
P_c Coefficient	0.22	Low (Flat)

Flux value passing through the pole surface. Key data in coil applications and motors. P_c value defines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 30x20x4 / N38

Environment	Effective steel pull	Effect
Air (land)	6.30 kg	Standard
Water (riverbed)	7.21 kg (+0.91 kg Buoyancy gain)	+14.5%

Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Warning: On a vertical wall, the magnet holds just a fraction of its max power.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.22

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 P_c (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 P_c 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

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

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: 020286-2025

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x20x4 mm and a weight of 18 g, guarantees the highest quality connection. As a block magnet with high power (approx. 6.30 kg), this product is available immediately from our warehouse in Poland. Additionally, 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 30x20x4 / 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 30x20x4 / 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. 6.30 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 30x20x4 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).

Standardly, the MPL 30x20x4 / N38 model is magnetized axially (dimension 4 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

This model is characterized by dimensions 30x20x4 mm, which, at a weight of 18 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 6.30 kg (force ~61.84 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd₂Fe₁₄B magnets.

Strengths

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

Their strength is maintained, and after around ten years it drops only by ~1% (according to research),
Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external field sources,
Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to the potential of flexible shaping and adaptation to specialized projects, NdFeB magnets can be created in a broad palette of shapes and sizes, which increases their versatility,
Versatile presence in high-tech industry – they find application in HDD drives, electric motors, medical equipment, also technologically advanced constructions.
Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Cons of neodymium magnets and proposals for their use:

To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
Due to limitations in producing threads and complicated shapes in magnets, we propose using a housing - magnetic holder.
Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices are able to be problematic in diagnostics medical after entering the body.
With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Breakaway force is the result of a measurement for ideal contact conditions, assuming:

using a sheet made of low-carbon steel, serving as a magnetic yoke
possessing a massiveness of minimum 10 mm to ensure full flux closure
with a surface perfectly flat
without the slightest clearance between the magnet and steel
under perpendicular application of breakaway force (90-degree angle)
in neutral thermal conditions

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity results from several key aspects, ranked from the most important:

Air gap (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Steel thickness – insufficiently thick steel does not close the flux, causing part of the flux to be wasted into the air.
Material type – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
Thermal environment – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets

Handling guide

Handle with care. Rare earth magnets act from a distance and snap with massive power, often faster than you can move away.

Magnets are brittle

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Warning for heart patients

Patients with a pacemaker should maintain an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Nickel allergy

Studies show that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands or select versions in plastic housing.

Swallowing risk

Always keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are life-threatening.

Keep away from electronics

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Demagnetization risk

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Dust explosion hazard

Dust produced during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Physical harm

Protect your hands. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Electronic devices

Device Safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, timepieces).

Attention! Want to know more? Read our article: Are neodymium magnets dangerous?

MPL 30x20x4 / N38 - lamellar magnet

Technical details - MPL 30x20x4 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the product - report

Table 1: Static pull force (force vs gap) - characteristics MPL 30x20x4 / N38

Table 2: Shear capacity (vertical surface) MPL 30x20x4 / N38

Table 3: Vertical assembly (sliding) - vertical pull MPL 30x20x4 / N38

Table 4: Material efficiency (substrate influence) - power losses MPL 30x20x4 / N38

Table 5: Thermal resistance (stability) - resistance threshold MPL 30x20x4 / N38

Table 6: Two magnets (attraction) - field collision MPL 30x20x4 / N38

Table 7: Safety (HSE) (implants) - precautionary measures MPL 30x20x4 / N38

Table 8: Collisions (kinetic energy) - warning MPL 30x20x4 / N38

Table 9: Anti-corrosion coating durability MPL 30x20x4 / N38

Table 10: Construction data (Flux) MPL 30x20x4 / N38

Table 11: Physics of underwater searching MPL 30x20x4 / N38

1. Shear force

2. Steel saturation

3. Heat tolerance

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

Material specification

Environmental data

Pulling force

Magnetic Field

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Pros and cons of Nd2Fe14B magnets.

Strengths

Disadvantages

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Magnet lifting force in use – key factors

H&S for magnets

Handling guide

Magnets are brittle

Warning for heart patients

Nickel allergy

Swallowing risk

Keep away from electronics

Demagnetization risk

Dust explosion hazard

Physical harm

Electronic devices

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
MPL 30x20x4 / N38

Table 2: Shear capacity (vertical surface)
MPL 30x20x4 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MPL 30x20x4 / N38

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x20x4 / N38

Table 5: Thermal resistance (stability) - resistance threshold
MPL 30x20x4 / N38

Table 6: Two magnets (attraction) - field collision
MPL 30x20x4 / N38

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 30x20x4 / N38

Table 8: Collisions (kinetic energy) - warning
MPL 30x20x4 / N38

Table 9: Anti-corrosion coating durability
MPL 30x20x4 / N38

Table 10: Construction data (Flux)
MPL 30x20x4 / N38

Table 11: Physics of underwater searching
MPL 30x20x4 / N38

Pros and cons of Nd₂Fe₁₄B magnets.