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SM 18x125 [2xM5] / N42 - magnetic separator

magnetic separator

Catalog no 130270

GTIN: 5906301812722

Diameter Ø [±0,1 mm]

18 mm

Height [±0,1 mm]

125 mm

Weight

0.01 g

276.75 ZŁ with VAT / pcs + price for transport

225.00 ZŁ net + 23% VAT / pcs

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SM 18x125 [2xM5] / N42 - magnetic separator

Specification/characteristics SM 18x125 [2xM5] / N42 - magnetic separator

properties

values

Cat. no.

130270

GTIN

5906301812722

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

18 mm [±0,1 mm]

Height

125 mm [±0,1 mm]

Weight

0.01 g [±0,1 mm]

Manufacturing Tolerance

± 0.1 mm

Magnetic properties of material N42

properties

values

units

coercivity bHc ?

860-955

kA/m

coercivity bHc ?

10.8-12.0

kOe

energy density [Min. - Max.] ?

318-334

BH max KJ/m

energy density [Min. - Max.] ?

40-42

BH max MGOe

remenance Br [Min. - Max.] ?

12.9-13.2

kGs

remenance Br [Min. - Max.] ?

1290-1320

actual internal force iHc

≥ 955

kA/m

actual internal force iHc

≥ 12

kOe

max. temperature ?

≤ 80

°C

Physical properties of NdFeB

properties

values

units

Vickers hardness

≥550

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

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The magnetic separator, namely the magnetic roller, uses the power of neodymium magnets, placed in a casing made of stainless steel mostly AISI304. In this way, it is possible to precisely separate ferromagnetic elements from the mixture. A key aspect of its operation is the repulsion of N and S poles of neodymium magnets, which enables magnetic substances to be collected. The thickness of the embedded magnet and its structure pitch affect the power and range of the separator's operation.

Generally speaking, magnetic separators are used to separate ferromagnetic elements. If the cans are made of ferromagnetic materials, the separator will be able to separate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the magnetic separator will not be effective.

Yes, magnetic rollers are used in the food sector for the elimination of metallic contaminants, including iron fragments or iron dust. Our rods are made from acid-resistant steel, AISI 304, intended for contact with food.

Magnetic rollers, otherwise cylindrical magnets, are used in metal separation, food production as well as recycling. They help in removing iron dust in the course of the process of separating metals from other wastes.

Our magnetic rollers consist of neodymium magnets placed in a tube of stainless steel with a wall thickness of 1mm.

From both sides of the magnetic bar can be with M8 threaded openings, enabling simple mounting in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.

In terms of features, magnetic bars differ in terms of magnetic force lines, flux density and the field of the magnetic field. We produce them in materials, N42 as well as N52.

Generally it is believed that the greater the magnet's power, the better. However, 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 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. On the other hand, when the magnet is thick, the force lines will be longer and reach further.

For making the casings of magnetic separators - rollers, frequently stainless steel is employed, particularly types AISI 304, AISI 316, and AISI 316L.

In a saltwater environment, AISI 316 steel is recommended due to its exceptional anti-corrosion properties.

Magnetic bars are characterized by their specific arrangement of poles and their ability to attract magnetic particles directly onto their surface, as opposed to other devices that may utilize complex filtration systems.

Technical designations and terms pertaining to magnetic separators comprise among others polarity, magnetic induction, magnet pitch, as well as the type of steel used.

Magnetic induction for a magnet on a roller is measured using a teslameter or a gaussmeter with a flat Hall-effect probe, seeking the highest magnetic field value close to the magnetic pole. The outcome 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 a very strong magnetic field, the ability to capture even the tiniest metal particles, and durability. On the other hand, among the drawbacks, one can mention the need for regular cleaning, higher cost, and potential installation challenges.

To properly maintain of neodymium magnetic rollers, it’s worth regularly cleaning them from deposits, avoiding high temperatures up to 80°C, and shielding them from moisture if the threads are not sealed – in ours, they are. The rollers feature waterproofing IP67, so if they are leaky, the magnets inside can oxidize and lose their power. Magnetic field measurements is recommended be carried out once every 24 months. Care should be taken, as it’s possible of finger injury. 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 applied in industries such as food processing, ceramics, and recycling, where the removal of iron metals and iron filings is essential.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They virtually do not lose power, because even after 10 years, the decline in efficiency is only ~1% (according to literature),
They are highly resistant to demagnetization caused by external magnetic fields,
In other words, due to the glossy nickel coating, the magnet obtains an aesthetic appearance,
They exhibit elevated levels of magnetic induction near the outer area of the magnet,
Thanks to their exceptional temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C or more,
With the option for tailored forming and targeted design, these magnets can be produced in multiple shapes and sizes, greatly improving engineering flexibility,
Key role in modern technologies – they find application in data storage devices, electric drives, medical equipment as well as sophisticated instruments,
Relatively small size with high magnetic force – neodymium magnets offer strong power in small dimensions, which makes them useful in compact constructions

Disadvantages of rare earth magnets:

They may fracture when subjected to a powerful impact. If the magnets are exposed to mechanical hits, it is advisable to use in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from fracture and increases its overall durability,
High temperatures may significantly reduce the field efficiency of neodymium magnets. Typically, above 80°C, they experience permanent decline in performance (depending on size). To prevent this, we offer heat-resistant magnets marked [AH], capable of working up to 230°C, which makes them perfect for high-temperature use,
Magnets exposed to moisture can corrode. Therefore, for outdoor applications, we suggest waterproof types made of rubber,
The use of a protective casing or external holder is recommended, since machining multi-axis shapes in neodymium magnets is not feasible,
Potential hazard related to magnet particles may arise, especially if swallowed, which is notable in the health of young users. Additionally, miniature parts from these products might disrupt scanning if inside the body,
High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which increases the cost of large-scale applications

Magnetic strength at its maximum – what it depends on?

The given lifting capacity of the magnet represents the maximum lifting force, calculated in a perfect environment, namely:

with mild steel, used as a magnetic flux conductor
with a thickness of minimum 10 mm
with a smooth surface
with no separation
under perpendicular detachment force
under standard ambient temperature

What influences lifting capacity in practice

The lifting capacity of a magnet is determined 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.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap {between} the magnet and the plate lowers the holding force.

Handle Neodymium Magnets Carefully

You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.

The strong magnetic field generated by neodymium magnets can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also damage videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Neodymium magnets are the strongest, most remarkable magnets on earth, and the surprising force between them can surprise you at first.

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional damage 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. Once crushed into fine powder or dust, this material becomes highly flammable.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere 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.

It is essential to maintain neodymium magnets away from 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.

Neodymium magnets can become demagnetized at high temperatures.

Even though magnets have been observed to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

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.

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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

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 attract each other within a distance of several to around 10 cm from each other. Remember not to put fingers between magnets or in their path when attract. Depending on how huge the neodymium magnets are, they can lead to a cut or a fracture.

Neodymium magnetic are highly susceptible to damage, resulting in breaking.

Neodymium magnets are fragile and will shatter if allowed to collide with each other, even from a distance of a few centimeters. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. 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.

Warning!

To raise awareness of why neodymium magnets are so dangerous, read the article titled How dangerous are very powerful neodymium magnets?.