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SM 25x150 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130289

GTIN: 5906301812821

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

150 mm

Weight

0.01 g

393.60 with VAT / pcs + price for transport

320.00 ZŁ net + 23% VAT / pcs

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Force along with form of a neodymium magnet can be reviewed with our force calculator.

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SM 25x150 [2xM8] / N42 - magnetic separator

Specification/characteristics SM 25x150 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130289
GTIN
5906301812821
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
150 mm [±0,1 mm]
Weight
0.01 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N42

properties
values
units
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
coercivity bHc ?
10.8-12.0
kOe
coercivity bHc ?
860-955
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
40-42
BH max MGOe
energy density [Min. - Max.] ?
318-334
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, which are welded in a construction made of stainless steel mostly AISI304. In this way, it is possible to precisely separate ferromagnetic particles from the mixture. A fundamental component of its operation is the use of repulsion of N and S poles of neodymium magnets, which allows magnetic substances to be attracted. The thickness of the magnet and its structure's pitch determine the power and range of the separator's operation.
Generally speaking, magnetic separators serve to separate ferromagnetic particles. If the cans are made of 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 be able to separate them.
Yes, magnetic rollers are used in the food industry to clear metallic contaminants, including iron fragments or iron dust. Our rods are built from acid-resistant steel, EN 1.4301, suitable for use in food.
Magnetic rollers, otherwise magnetic separators, find application in metal separation, food production as well as recycling. They help in eliminating iron dust during the process of separating metals from other wastes.
Our magnetic rollers consist of a neodymium magnet anchored in a stainless steel tube cylinder of stainless steel with a wall thickness of 1mm.
From both sides of the magnetic bar will be with M8 threaded holes - 18 mm, allowing for easy 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 field of the magnetic field. We produce them in two materials, N42 and N52.
Often it is believed that the greater the magnet's power, the more efficient it is. But, the effectiveness of the magnet's power depends 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 specific needs. The standard operating temperature of a magnetic bar is 80°C.
If the magnet is more flat, the magnetic force lines are more compressed. By contrast, when the magnet is thick, the force lines are extended and reach further.
For constructing the casings of magnetic separators - rollers, usually stainless steel is used, particularly types AISI 304, AISI 316, and AISI 316L.
In a salt water environment, type AISI 316 steel is recommended due to its excellent corrosion resistance.
Magnetic bars are characterized by their specific arrangement of poles and their capability to attract magnetic substances directly onto their surface, in contrast to other devices that may utilize complex filtration systems.
Technical designations and terms pertaining to magnetic separators include amongst others magnet pitch, polarity, and magnetic induction, as well as the type of steel used.
Magnetic induction for a roller is determined 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 outcome is verified in a value table - the lowest is N30. All designations below N27 or N25 indicate recycling that doesn't meet the standard - they are not suitable.
Neodymium magnetic bars offer many advantages, including excellent separation efficiency, strong magnetic field, and durability. On the other hand, among the drawbacks, one can mention the requirement for frequent cleaning, greater weight, and potential installation difficulties.
By ensuring proper maintenance of neodymium magnetic rollers, it is recommended cleaning after each use, avoiding temperatures above 80 degrees. The rollers our rollers have waterproofing IP67, so if they are leaky, the magnets inside can rust and lose their power. Magnetic field measurements should be carried out every two years. Caution should be taken during use, 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 range of the roller is equal 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, which are used to remove metal contaminants from bulk and granular 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 immense strength, neodymium magnets offer the following advantages:

  • They do not lose their magnetism, even after approximately ten years – the reduction of lifting capacity is only ~1% (based on measurements),
  • Their ability to resist magnetic interference from external fields is impressive,
  • The use of a mirror-like gold surface provides a eye-catching finish,
  • Magnetic induction on the surface of these magnets is notably high,
  • Neodymium magnets are known for strong magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the magnetic form),
  • Thanks to the possibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in diverse shapes and sizes, which broadens their application range,
  • Significant impact in modern technologies – they find application in hard drives, rotating machines, medical equipment along with sophisticated instruments,
  • Compactness – despite their small size, they provide high effectiveness, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • They are fragile when subjected to a powerful impact. If the magnets are exposed to physical collisions, we recommend in a protective case. The steel housing, in the form of a holder, protects the magnet from fracture , and at the same time strengthens its overall strength,
  • They lose magnetic force at high temperatures. Most neodymium magnets experience permanent reduction in strength when heated above 80°C (depending on the form and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • Magnets exposed to damp air can corrode. Therefore, for outdoor applications, we advise waterproof types made of rubber,
  • The use of a protective casing or external holder is recommended, since machining fine details in neodymium magnets is not feasible,
  • Safety concern linked to microscopic shards may arise, if ingested accidentally, which is important in the protection of children. Additionally, tiny components from these assemblies may complicate medical imaging once in the system,
  • In cases of mass production, neodymium magnet cost may not be economically viable,

Breakaway strength of the magnet in ideal conditionswhat affects it?

The given holding capacity of the magnet means the highest holding force, measured in the best circumstances, 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 smooth surface
  • with no separation
  • under perpendicular detachment force
  • at room temperature

Practical aspects of lifting capacity – factors

The lifting capacity of a magnet is influenced by in practice key elements, according to their importance:

  • Air gap between the magnet and the plate, because 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 checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet and the plate lowers the load capacity.

Caution with Neodymium Magnets

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

  Do not give neodymium magnets to youngest children.

Not all neodymium magnets are toys, so do not let children play with them. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

The magnet coating is made of nickel, so be cautious if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including 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 can become demagnetized at high temperatures.

Although magnets have demonstrated their effectiveness up to 80°C or 175°F, the temperature can vary depending on the type, shape, and intended use of the specific magnet.

Neodymium magnets are among the most powerful magnets on Earth. The astonishing force they generate between each other can surprise you.

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

Dust and powder from neodymium magnets are 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.

Never bring neodymium magnets close to a phone and GPS.

Neodymium magnets generate strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Magnets made of neodymium are incredibly fragile, they easily crack as well as can crumble.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. At the moment of collision between the magnets, tiny sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.

Magnets may crack or crumble with careless joining to each other. You can't approach them to each other. At a distance less than 10 cm you should hold them very strongly.

Do not place neodymium magnets near a computer HDD, TV, and wallet.

Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

Caution!

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

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98