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SM 25x350 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130350

GTIN: 5906301812982

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

350 mm

Weight

0.01 g

984.00 ZŁ with VAT / pcs + price for transport

800.00 ZŁ net + 23% VAT / pcs

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SM 25x350 [2xM8] / N42 - magnetic separator

Specification/characteristics SM 25x350 [2xM8] / N42 - magnetic separator

properties

values

Cat. no.

130350

GTIN

5906301812982

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

25 mm [±0,1 mm]

Height

350 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 device roller magnetic is based on the use of neodymium magnets, which are placed in a casing made of stainless steel mostly AISI304. In this way, it is possible to efficiently segregate ferromagnetic elements from other materials. A fundamental component of its operation is the repulsion of magnetic poles N and S, which causes magnetic substances to be collected. The thickness of the embedded magnet and its structure pitch affect the range and strength of the separator's operation.

Generally speaking, magnetic separators are designed to extract ferromagnetic particles. 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 separator will not effectively segregate them.

Yes, magnetic rollers find application in the food sector to remove metallic contaminants, such as iron fragments or iron dust. Our rods are built from acid-resistant steel, EN 1.4301, intended for contact with food.

Magnetic rollers, otherwise magnetic separators, are employed in metal separation, food production as well as waste processing. They help in removing iron dust in the course of the process of separating metals from other materials.

Our magnetic rollers are composed of a neodymium magnet embedded in a stainless steel tube cylinder made of stainless steel with a wall thickness of 1mm.

Both ends of the magnetic bar can be with M8 threaded holes - 18 mm, which enables 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 area of operation of the magnetic field. We produce them in materials, N42 as well as N52.

Usually it is believed that the greater the magnet's power, the more efficient it is. However, the strength of the magnet's power is based on the height of the used magnet and the quality of the material [N42] or [N52], as well as on the area of use and expected needs. The standard operating temperature of a magnetic bar is 80°C.

In the case where the magnet is more flat, the magnetic force lines are short. On the other hand, when the magnet is thick, the force lines will be extended and reach further.

For constructing the casings of magnetic separators - rollers, usually stainless steel is utilized, especially types AISI 304, AISI 316, and AISI 316L.

In a saltwater contact, type AISI 316 steel is recommended thanks to its outstanding anti-corrosion properties.

Magnetic bars stand out for their specific arrangement of poles and their capability to attract magnetic substances directly onto their surface, as opposed to other devices that may utilize more complicated filtration systems.

Technical designations and terms related to magnetic separators include amongst others polarity, magnetic induction, magnet pitch, as well as the type of steel used.

Magnetic induction for a magnet on a roller is determined using a teslameter or a gaussmeter with a flat Hall-effect probe, seeking the highest magnetic field value near the magnetic pole. The result is checked in a value table - the lowest is N30. All designations less than N27 or N25 suggest recycling that falls below the standard - they are not suitable.

Neodymium magnetic rollers offer a range of benefits such as higher attracting power, longer lifespan, and effectiveness in separating fine metal particles. However, some of the downsides may involve the need for regular cleaning, higher cost, and potential installation challenges.

By ensuring proper maintenance of neodymium magnetic rollers, it is recommended cleaning regularly, avoiding temperatures above 80 degrees. The rollers our rollers have waterproofing IP67, so if they are not sealed, the magnets inside can rust and lose their power. Magnetic field measurements is recommended be carried out once every 24 months. Care should be taken, as there is a risk of finger injury. If the protective tube is only 0.5 mm thick, it may wear out, which in turn could cause 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 applied in industries such as food processing, ceramics, and recycling, where metal separation is crucial.

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

They have constant strength, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
They show exceptional resistance to demagnetization from outside magnetic sources,
In other words, due to the glossy silver coating, the magnet obtains an aesthetic appearance,
Magnetic induction on the surface of these magnets is impressively powerful,
These magnets tolerate high temperatures, often exceeding 230°C, when properly designed (in relation to profile),
With the option for fine forming and targeted design, these magnets can be produced in various shapes and sizes, greatly improving design adaptation,
Important function in new technology industries – they serve a purpose in data storage devices, electric motors, healthcare devices as well as high-tech tools,
Compactness – despite their small size, they generate strong force, making them ideal for precision applications

Disadvantages of neodymium magnets:

They are prone to breaking when subjected to a sudden impact. If the magnets are exposed to shocks, it is suggested to place them in a steel housing. The steel housing, in the form of a holder, protects the magnet from fracture and increases its overall robustness,
High temperatures may significantly reduce the magnetic power of neodymium magnets. Typically, above 80°C, they experience permanent weakening in performance (depending on height). 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,
Due to corrosion risk in humid conditions, it is common to use sealed magnets made of plastic for outdoor use,
Limited ability to create complex details in the magnet – the use of a magnetic holder is recommended,
Possible threat linked to microscopic shards may arise, especially if swallowed, which is crucial in the health of young users. Moreover, miniature parts from these products might interfere with diagnostics once in the system,
High unit cost – neodymium magnets are more expensive than other types of magnets (e.g., ferrite), which can restrict large-scale applications

Caution with Neodymium Magnets

Neodymium magnets can demagnetize 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 magnetic are fragile and can easily break as well as get damaged.

Neodymium magnets are characterized by significant fragility. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. At the moment of collision between the magnets, sharp metal fragments can be dispersed in different directions.

Keep neodymium magnets as far away as possible from GPS and smartphones.

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

Do not place neodymium magnets 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.

Neodymium magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant injuries.

In the case of holding a finger in the path of a neodymium magnet, in that situation, a cut or a fracture may occur.

If you have a nickel allergy, avoid contact with neodymium magnets.

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

People with pacemakers are advised to avoid neodymium magnets.

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.

Dust and powder from neodymium magnets are highly 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 around children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Neodymium magnets are among the strongest magnets on Earth. The surprising force they generate between each other can surprise you.

Familiarize yourself with our information to properly handle these magnets and avoid significant swellings to your body and prevent damage to the magnets.

Safety precautions!

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