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SM 25x250 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130371

GTIN: 5906301813194

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

250 mm

Weight

0.01 g

762.60 with VAT / pcs + price for transport

620.00 ZŁ net + 23% VAT / pcs

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SM 25x250 [2xM8] / N52 - magnetic separator

Specification/characteristics SM 25x250 [2xM8] / N52 - magnetic separator
properties
values
Cat. no.
130371
GTIN
5906301813194
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
250 mm [±0,1 mm]
Weight
0.01 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N52

properties
values
units
remenance Br [Min. - Max.] ?
14.2-14.7
kGs
remenance Br [Min. - Max.] ?
1420-1470
T
coercivity bHc ?
10.8-12.5
kOe
coercivity bHc ?
860-995
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
48-53
BH max MGOe
energy density [Min. - Max.] ?
380-422
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of NdFeB

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 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

The main mechanism of the magnetic separator is the use of neodymium magnets, placed in a casing made of stainless steel usually AISI304. In this way, it is possible to efficiently separate ferromagnetic elements from other materials. An important element of its operation is the use of repulsion of magnetic poles N and S, which causes magnetic substances to be attracted. The thickness of the magnet and its structure pitch affect the power and range of the separator's operation.
Generally speaking, magnetic separators are used to separate ferromagnetic particles. If the cans are made from ferromagnetic materials, a magnetic separator will be effective. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the separator will not effectively segregate them.
Yes, magnetic rollers are employed in food production for the elimination of metallic contaminants, including iron fragments or iron dust. Our rods are built from acid-resistant steel, EN 1.4301, intended for contact with food.
Magnetic rollers, often called magnetic separators, are used in food production, metal separation as well as recycling. They help in removing iron dust during the process of separating metals from other materials.
Our magnetic rollers are built with neodymium magnets placed in a stainless steel tube cylinder of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar can be with M8 threaded openings, allowing for quick installation in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.
In terms of features, magnetic bars stand out in terms of flux density, magnetic force lines and the area of operation of the magnetic field. We produce them in two materials, N42 as well as N52.
Often it is believed that the stronger the magnet, the more efficient it is. However, the effectiveness of the magnet's power is dependent on the height of the used magnet and the quality of the material [N42] or [N52], as well as on the area of application and expected needs. The standard operating temperature of a magnetic bar is 80°C.
In the case where the magnet is thin, the magnetic force lines will be short. By contrast, in the case of a thicker magnet, the force lines are extended and extend over a greater distance.
For making the casings of magnetic separators - rollers, frequently stainless steel is employed, especially types AISI 316, AISI 316L, and AISI 304.
In a salt water contact, AISI 316 steel exhibits the best resistance thanks to its exceptional corrosion resistance.
Magnetic bars are characterized by their specific arrangement of poles and their capability to attract magnetic substances directly onto their surface, as opposed to other devices that often use more complicated filtration systems.
Technical designations and terms related to magnetic separators comprise amongst others magnet pitch, polarity, and magnetic induction, as well as the type of steel used.
Magnetic induction for a roller is measured using a teslameter or a gaussmeter with a flat Hall-effect probe, aiming to find the highest magnetic field value near the magnetic pole. The result is verified in a value table - the lowest is N30. All designations less than N27 or N25 indicate recycling that doesn't meet the standard - they are not suitable.
Neodymium magnetic rollers offer a range of benefits such as excellent separation efficiency, strong magnetic field, and durability. On the other hand, among the drawbacks, one can mention the need for regular cleaning, higher cost, and potential installation challenges.
By ensuring proper maintenance of neodymium magnetic rollers, it’s worth they should be regularly cleaned, avoiding temperatures up to 80°C. The rollers our rollers have waterproofing IP67, so if they are not sealed, the magnets inside can oxidize and lose their power. Magnetic field measurements should be carried out once every 24 months. Care should be taken, as it’s possible getting pinched. If the protective tube is only 0.5 mm thick, it may wear out, which in turn could lead to problems with the magnetic rod seal and product contamination. The effective range of the roller corresponds to its diameter: fi25mm gives an active range of about 25mm, while fi32 gives an active range of about 40mm.
Magnetic rollers are cylindrical neodymium magnets placed in a casing made of corrosion-resistant stainless steel, used for separating ferromagnetic contaminants from raw materials. They are used in the food industry, recycling, and plastic processing, where the removal of iron metals and iron filings is essential.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their tremendous strength, neodymium magnets offer the following advantages:

  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • Their ability to resist magnetic interference from external fields is notable,
  • By applying a reflective layer of silver, the element gains a modern look,
  • Magnetic induction on the surface of these magnets is notably high,
  • These magnets tolerate extreme temperatures, often exceeding 230°C, when properly designed (in relation to profile),
  • With the option for customized forming and targeted design, these magnets can be produced in multiple shapes and sizes, greatly improving application potential,
  • Key role in cutting-edge sectors – they find application in HDDs, electric motors, clinical machines and technologically developed systems,
  • Relatively small size with high magnetic force – neodymium magnets offer impressive pulling strength in small dimensions, which makes them useful in compact constructions

Disadvantages of rare earth magnets:

  • They are prone to breaking when subjected to a heavy impact. If the magnets are exposed to mechanical hits, it is suggested to place them in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from fracture while also strengthens its overall resistance,
  • They lose magnetic force at increased temperatures. Most neodymium magnets experience permanent reduction in strength when heated above 80°C (depending on the shape and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • They rust in a wet environment, especially when used outside, we recommend using moisture-resistant magnets, such as those made of rubber,
  • The use of a protective casing or external holder is recommended, since machining threads in neodymium magnets is risky,
  • Health risk from tiny pieces may arise, in case of ingestion, which is crucial in the protection of children. Moreover, miniature parts from these devices can complicate medical imaging when ingested,
  • Due to expensive raw materials, their cost is considerably higher,

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The given strength of the magnet means the optimal strength, measured under optimal conditions, namely:

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • having a thickness of no less than 10 millimeters
  • with a refined outer layer
  • with zero air gap
  • in a perpendicular direction of force
  • under standard ambient temperature

Practical lifting capacity: influencing factors

In practice, the holding capacity of a magnet is affected by these factors, from crucial to less important:

  • Air gap between the magnet and the plate, as even a very small distance (e.g. 0.5 mm) causes a drop in lifting force of up to 50%.
  • Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
  • Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
  • Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
  • Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
  • Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.

Handle Neodymium Magnets Carefully

Keep neodymium magnets away from people with pacemakers.

In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.

Never bring neodymium magnets close to a phone and GPS.

Intense magnetic fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

Dust and powder from neodymium magnets are highly flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Neodymium magnets are the most powerful magnets ever created, and their strength can shock you.

Please review the information on how to handle neodymium magnets and avoid significant harm to your body, as well as prevent unintentional damage to the magnets.

Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.

Neodymium magnets will jump and also touch together within a distance of several to around 10 cm from each other.

The magnet coating contains nickel, so be cautious if you have a nickel allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets are especially fragile, resulting in their breakage.

Neodymium magnets are fragile as well as will crack if allowed to collide with each other, even from a distance of a few centimeters. They are coated with a shiny nickel plating similar to steel, but they are not as hard. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

Under no circumstances should neodymium magnets be placed near a computer HDD, TV, and wallet.

Magnetic fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

  Do not give neodymium magnets to youngest children.

Not all neodymium magnets are toys, so do not let children play with them. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Neodymium magnets can become demagnetized at high temperatures.

While Neodymium magnets can lose their magnetic properties at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.

Pay attention!

Please see the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

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