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SM 25x175 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130290

GTIN: 5906301812838

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

175 mm

Weight

0.01 g

467.40 ZŁ with VAT / pcs + price for transport

380.00 ZŁ net + 23% VAT / pcs

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SM 25x175 [2xM8] / N42 - magnetic separator

Specification/characteristics SM 25x175 [2xM8] / N42 - magnetic separator

properties

values

Cat. no.

130290

GTIN

5906301812838

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

25 mm [±0,1 mm]

Height

175 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 rod magnetic is based on the use of neodymium magnets, which are placed in a construction made of stainless steel usually AISI304. As a result, it is possible to efficiently separate ferromagnetic particles from the mixture. A key aspect of its operation is the use of repulsion of magnetic poles N and S, which enables 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 extract ferromagnetic particles. If the cans are made from ferromagnetic materials, the separator will effectively segregate 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 employed in the food sector to clear metallic contaminants, including iron fragments or iron dust. Our rollers are constructed from acid-resistant steel, AISI 304, suitable for use in food.

Magnetic rollers, often called cylindrical magnets, find application 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 wastes.

Our magnetic rollers consist of a neodymium magnet anchored in a tube made of stainless steel with a wall thickness of 1mm.

From both sides of the magnetic bar can be with M8 threaded holes - 18 mm, allowing for simple mounting 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 magnetic force lines, flux density and the area of operation of the magnetic field. We produce them in two materials, N42 and N52.

Usually it is believed that the stronger the magnet, the better. However, the strength 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 use and anticipated needs. The standard operating temperature of a magnetic bar is 80°C.

In the case where the magnet is thin, the magnetic force lines are more compressed. By contrast, when the magnet is thick, the force lines are extended and reach further.

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

In a salt water environment, type AISI 316 steel is highly recommended due to its exceptional corrosion resistance.

Magnetic bars are characterized by their unique configuration 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 related to magnetic separators comprise among others magnet pitch, polarity, and magnetic induction, as well as the steel type applied.

Magnetic induction for a magnet on 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 checked 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 rollers offer many advantages, including 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 higher cost compared to other types of magnets and the need for regular maintenance.

By ensuring proper maintenance of neodymium magnetic rollers, it’s worth they should be regularly cleaned, avoiding temperatures above 80 degrees. The rollers feature waterproofing IP67, so if they are leaky, the magnets inside can rust and weaken. Testing of the rollers should be carried out once every 24 months. Caution should be taken during use, 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 lead to problems with the magnetic rod seal and product contamination. The effective 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, used for separating ferromagnetic contaminants from raw 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 and disadvantages of neodymium magnets NdFeB.

In addition to their exceptional magnetic power, neodymium magnets offer the following advantages:

They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
They are very resistant to demagnetization caused by external magnetic sources,
Thanks to the shiny finish and gold coating, they have an aesthetic appearance,
Magnetic induction on the surface of these magnets is notably high,
These magnets tolerate high temperatures, often exceeding 230°C, when properly designed (in relation to build),
The ability for precise shaping as well as adjustment to custom needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which enhances their versatility in applications,
Important function in modern technologies – they are used in HDDs, electric drives, clinical machines or even sophisticated instruments,
Thanks to their concentrated strength, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of neodymium magnets:

They may fracture when subjected to a sudden impact. If the magnets are exposed to external force, we recommend in a steel housing. The steel housing, in the form of a holder, protects the magnet from fracture while also reinforces its overall durability,
High temperatures may significantly reduce the strength of neodymium magnets. Typically, above 80°C, they experience permanent deterioration 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 humidity can oxidize. 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 restricted,
Health risk linked to microscopic shards may arise, if ingested accidentally, which is notable in the context of child safety. Moreover, minuscule fragments from these magnets can hinder health screening when ingested,
Due to the price of neodymium, their cost is relatively high,

Maximum lifting capacity of the magnet – what it depends on?

The given holding capacity of the magnet corresponds to the highest holding force, calculated under optimal conditions, namely:

with the use of low-carbon steel plate acting as a magnetic yoke
with a thickness of minimum 10 mm
with a refined outer layer
with no separation
in a perpendicular direction of force
in normal thermal conditions

Key elements affecting lifting force

In practice, the holding capacity of a magnet is affected by the following aspects, in descending order of importance:

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 tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.

Be Cautious with Neodymium Magnets

Neodymium magnetic 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. They are coated with a shiny nickel plating similar to steel, but they are not as hard. At the moment of connection between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

Keep neodymium magnets away from people with pacemakers.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Neodymium magnets can demagnetize at high temperatures.

In certain circumstances, Neodymium magnets can lose their magnetism when subjected to high temperatures.

Neodymium magnets can attract to each other, pinch the skin, and cause significant injuries.

Magnets will crack or crumble with uncontrolled connecting to each other. Remember not to approach them to each other or hold them firmly in hands at a distance less than 10 cm.

Neodymium magnets are the strongest magnets ever invented. Their power can shock you.

On our website, you can find information on how to use neodymium magnets. This will help you avoid injuries and prevent damage to the magnets.

Maintain neodymium magnets far from children.

Remember that neodymium magnets are not toys. Do not allow children to play with them. They can be a significant choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing severe injuries, and even death.

Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.

Neodymium magnets produce strong magnetic fields that can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also destroy devices like video players, televisions, CRT computer monitors. Do not forget to keep neodymium magnets at a safe distance from these electronic devices.

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

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.

The magnet is coated with nickel - be careful if you have an 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.

Be careful!

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