Product available Ships tomorrow

MPL 20x5x3 / 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: PLN 1-6500
Rating: 5

lamellar magnet

Catalog no 020131

GTIN/EAN: 5906301811374

5.00

length

20 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

2.25 g

Magnetization Direction

↑ axial

Load capacity

3.46 kg / 33.96 N

Magnetic Induction

358.88 mT / 3589 Gs

Coating

[NiCuNi] Nickel

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1.058 ZŁ with VAT / pcs + price for transport

0.860 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 20x5x3 / N38 - lamellar magnet

Specification / characteristics - MPL 20x5x3 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020131
GTIN/EAN	5906301811374
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	20 mm [±0,1 mm]
Width	5 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	2.25 g
Magnetization Direction	↑ axial
Load capacity ~ ?	3.46 kg / 33.96 N
Magnetic Induction ~ ?	358.88 mT / 3589 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x5x3 / 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

Technical simulation of the magnet - data

The following data constitute the outcome of a physical calculation. Values rely on models for the class Nd₂Fe₁₄B. Real-world conditions may differ. Please consider these data as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - characteristics
MPL 20x5x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3585 Gs 358.5 mT	3.46 kg / 3460.0 g 33.9 N	medium risk
1 mm	2619 Gs 261.9 mT	1.85 kg / 1846.6 g 18.1 N	safe
2 mm	1818 Gs 181.8 mT	0.89 kg / 889.8 g 8.7 N	safe
3 mm	1279 Gs 127.9 mT	0.44 kg / 440.2 g 4.3 N	safe
5 mm	696 Gs 69.6 mT	0.13 kg / 130.6 g 1.3 N	safe
10 mm	225 Gs 22.5 mT	0.01 kg / 13.6 g 0.1 N	safe
15 mm	97 Gs 9.7 mT	0.00 kg / 2.5 g 0.0 N	safe
20 mm	49 Gs 4.9 mT	0.00 kg / 0.6 g 0.0 N	safe
30 mm	17 Gs 1.7 mT	0.00 kg / 0.1 g 0.0 N	safe
50 mm	4 Gs 0.4 mT	0.00 kg / 0.0 g 0.0 N	safe

Grip strength drops significantly with every subsequent millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, paint, veneer) significantly weakens the grip. Neodymiums work optimally in perfect adhesion; distance kills the power. Analyze how rapidly the pull force fall, when the magnet does not touch tightly to the metal substrate. When calculating the arrangement, eliminate unnecessary gaps.

Table 2: Slippage force (vertical surface)
MPL 20x5x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.69 kg / 692.0 g 6.8 N
1 mm	Stal (~0.2)	0.37 kg / 370.0 g 3.6 N
2 mm	Stal (~0.2)	0.18 kg / 178.0 g 1.7 N
3 mm	Stal (~0.2)	0.09 kg / 88.0 g 0.9 N
5 mm	Stal (~0.2)	0.03 kg / 26.0 g 0.3 N
10 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section presents the approximate holding capacity required to start the sliding of the magnet vertically against a vertical metal surface (assuming typical friction). This value varies with the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 20x5x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.04 kg / 1038.0 g 10.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.69 kg / 692.0 g 6.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.35 kg / 346.0 g 3.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.73 kg / 1730.0 g 17.0 N

When mounting a magnet on a upright plane (e.g., a board), it will maintain barely approx. 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip cause that products slip faster than they pull off. Designing a wall mount? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a significantly smaller cargo. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x5x3 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.35 kg / 346.0 g 3.4 N
1 mm	25%	0.87 kg / 865.0 g 8.5 N
2 mm	50%	1.73 kg / 1730.0 g 17.0 N
5 mm	100%	3.46 kg / 3460.0 g 33.9 N
10 mm	100%	3.46 kg / 3460.0 g 33.9 N

A thin sheet is incapable of focus the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a thin surface, the field will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (stability) - resistance threshold
MPL 20x5x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	3.46 kg / 3460.0 g 33.9 N	OK
40 °C	-2.2%	3.38 kg / 3383.9 g 33.2 N	OK
60 °C	-4.4%	3.31 kg / 3307.8 g 32.4 N
80 °C	-6.6%	3.23 kg / 3231.6 g 31.7 N
100 °C	-28.8%	2.46 kg / 2463.5 g 24.2 N

Ordinary NdFeB products change their properties power after exceeding the maximum temperature. Avoid high temperatures – excessive heat can irreversibly damage this magnet. As the temperature rises, the neodymium's power momentarily drops. Avoid using this magnet near heat sources higher than its working range. Ignoring the limit will cause permanent loss of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) risk losing magnetic properties sooner than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 20x5x3 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	7.92 kg / 7924 g 77.7 N 4 860 Gs	N/A
1 mm	5.94 kg / 5942 g 58.3 N 6 209 Gs	5.35 kg / 5348 g 52.5 N ~0 Gs
2 mm	4.23 kg / 4229 g 41.5 N 5 238 Gs	3.81 kg / 3806 g 37.3 N ~0 Gs
3 mm	2.94 kg / 2942 g 28.9 N 4 369 Gs	2.65 kg / 2647 g 26.0 N ~0 Gs
5 mm	1.42 kg / 1423 g 14.0 N 3 039 Gs	1.28 kg / 1281 g 12.6 N ~0 Gs
10 mm	0.30 kg / 299 g 2.9 N 1 393 Gs	0.27 kg / 269 g 2.6 N ~0 Gs
20 mm	0.03 kg / 31 g 0.3 N 450 Gs	0.03 kg / 28 g 0.3 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 56 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products interact from a significantly greater distance than a magnet and steel setup. The connection of two magnets generates a stronger field and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the impact force is massive. The levitation is marginally weaker than the connection force, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 20x5x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	5.0 cm
Hearing aid	10 Gs (1.0 mT)	4.0 cm
Mechanical watch	20 Gs (2.0 mT)	3.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	2.5 cm
Remote	50 Gs (5.0 mT)	2.0 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 IT equipment and pacemakers. These neodymiums generate a field that destroys function of digital equipment. Remember: the invisible magnetic field passes through tissues and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 20x5x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	39.65 km/h (11.01 m/s)	0.14 J
30 mm	68.50 km/h (19.03 m/s)	0.41 J
50 mm	88.43 km/h (24.56 m/s)	0.68 J
100 mm	125.06 km/h (34.74 m/s)	1.36 J

Magnetic elements are very brittle – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Surface protection spec
MPL 20x5x3 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (P_c)
MPL 20x5x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	3 197 Mx	32.0 µWb
P_c Coefficient	0.36	Low (Flat)

Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. The P_c coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 20x5x3 / N38

Environment	Effective steel pull	Effect
Air (land)	3.46 kg	Standard
Water (riverbed)	3.96 kg (+0.50 kg Buoyancy gain)	+14.5%

Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Note: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.

2. Steel saturation

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.36

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.

Technical and environmental data

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

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: 020131-2025

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Component MPL 20x5x3 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 3.46 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects 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 20x5x3 / 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. Thanks to the flat surface and high force (approx. 3.46 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 20x5x3 / N38, it is best to use strong epoxy glues (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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.

Standardly, the MPL 20x5x3 / N38 model is magnetized through the thickness (dimension 3 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. This is the most popular configuration for block magnets used in separators and holders.

The presented product is a neodymium magnet with precisely defined parameters: 20 mm (length), 5 mm (width), and 3 mm (thickness). It is a magnetic block with dimensions 20x5x3 mm and a self-weight of 2.25 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:

They retain full power for around 10 years – the loss is just ~1% (based on simulations),
Neodymium magnets prove to be remarkably resistant to loss of magnetic properties caused by external field sources,
The use of an refined layer of noble metals (nickel, gold, silver) causes the element to look better,
They are known for high magnetic induction at the operating surface, which improves attraction properties,
Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
Due to the possibility of precise forming and customization to unique needs, magnetic components can be manufactured in a wide range of forms and dimensions, which expands the range of possible applications,
Fundamental importance in future technologies – they serve a role in magnetic memories, electric drive systems, medical devices, as well as modern systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets and proposals for their use:

To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
When exposed to humidity, magnets start to 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 nuts in the magnet and complicated shapes - preferred is casing - mounting mechanism.
Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical after entering the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

The specified lifting capacity represents the limit force, measured under optimal environment, specifically:

with the application of a sheet made of special test steel, ensuring full magnetic saturation
with a thickness no less than 10 mm
characterized by even structure
under conditions of no distance (metal-to-metal)
during pulling in a direction vertical to the plane
in stable room temperature

Lifting capacity in practice – influencing factors

Please note that the magnet holding will differ influenced by elements below, in order of importance:

Clearance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Wall 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 type – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Moreover, even a small distance between the magnet and the plate decreases the holding force.

H&S for magnets

Protective goggles

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Skin irritation risks

Certain individuals suffer from a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching may cause an allergic reaction. It is best to wear safety gloves.

Electronic devices

Do not bring magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Medical implants

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

No play value

Product intended for adults. Small elements can be swallowed, causing severe trauma. Keep out of reach of children and animals.

Serious injuries

Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Permanent damage

Watch the temperature. Heating the magnet to high heat will destroy its properties and pulling force.

Powerful field

Handle magnets consciously. Their immense force can shock even professionals. Be vigilant and respect their force.

Compass and GPS

GPS units and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Do not drill into magnets

Fire hazard: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.

Security! Details about risks in the article: Safety of working with magnets.

MPL 20x5x3 / N38 - lamellar magnet

Detailed specification - MPL 20x5x3 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the magnet - data

Table 1: Static pull force (force vs gap) - characteristics MPL 20x5x3 / N38

Table 2: Slippage force (vertical surface) MPL 20x5x3 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces MPL 20x5x3 / N38

Table 4: Material efficiency (saturation) - sheet metal selection MPL 20x5x3 / N38

Table 5: Thermal stability (stability) - resistance threshold MPL 20x5x3 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MPL 20x5x3 / N38

Table 7: Safety (HSE) (electronics) - precautionary measures MPL 20x5x3 / N38

Table 8: Dynamics (kinetic energy) - collision effects MPL 20x5x3 / N38

Table 9: Surface protection spec MPL 20x5x3 / N38

Table 10: Construction data (Pc) MPL 20x5x3 / N38

Table 11: Physics of underwater searching MPL 20x5x3 / N38

1. Vertical hold

2. Steel saturation

3. Temperature resistance

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

Material specification

Ecology and recycling (GPSR)

Pulling force

Magnetic Induction

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Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Disadvantages

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Lifting capacity in practice – influencing factors

H&S for magnets

Protective goggles

Skin irritation risks

Electronic devices

Medical implants

No play value

Serious injuries

Permanent damage

Powerful field

Compass and GPS

Do not drill into magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
MPL 20x5x3 / N38

Table 2: Slippage force (vertical surface)
MPL 20x5x3 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 20x5x3 / N38

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x5x3 / N38

Table 5: Thermal stability (stability) - resistance threshold
MPL 20x5x3 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 20x5x3 / N38

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 20x5x3 / N38

Table 8: Dynamics (kinetic energy) - collision effects
MPL 20x5x3 / N38

Table 9: Surface protection spec
MPL 20x5x3 / N38

Table 10: Construction data (P_c)
MPL 20x5x3 / N38

Table 11: Physics of underwater searching
MPL 20x5x3 / N38

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.