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SM 25x225 [2xM8] / N42 - magnetic separator
magnetic separator
Catalog no 130292
GTIN/EAN: 5906301812852
Diameter Ø
25 mm [±1 mm]
Height
225 mm [±1 mm]
Weight
860 g
Magnetic Flux
~ 6 500 Gauss [±5%]
615.00 ZŁ with VAT / pcs + price for transport
500.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Force and structure of a neodymium magnet can be reviewed with our
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Technical of the product - SM 25x225 [2xM8] / N42 - magnetic separator
Specification / characteristics - SM 25x225 [2xM8] / N42 - magnetic separator
| properties | values |
|---|---|
| Cat. no. | 130292 |
| GTIN/EAN | 5906301812852 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 25 mm [±1 mm] |
| Height | 225 mm [±1 mm] |
| Weight | 860 g |
| Material Type | Stainless steel AISI 304 / A2 |
| Magnetic Flux | ~ 6 500 Gauss [±5%] |
| Size/Mount Quantity | 2xM8 |
| Polarity | circumferential - 8 poles |
| Casing Tube Thickness | 1 mm |
| Manufacturing Tolerance | ±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 | mT |
| 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 sintered neodymium magnets Nd2Fe14B at 20°C
| 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 10-6 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Table 1: Rod construction
SM 25x225 [2xM8] / N42
| Parameter | Value | Description / Unit |
|---|---|---|
| Diameter (Ø) | 25 | mm |
| Total length | 225 | mm (L) |
| Active length | 189 | mm |
| Section count | 8 | modules |
| Dead zone | 36 | mm (2x 18mm starter) |
| Weight (est.) | ~839 | g |
| Active area | 148 | cm² (Area) |
| Housing material | AISI 304 | 1.4301 (Inox) |
| Surface finish | Ra < 0.8 µm | Polished |
| Temp. class | 80°C | Standard (N) |
| Force loss (at max °C) | -12.8% | Reversible loss (physics) |
| Force (calculated) | 10.6 | kg (theor.) |
| Induction (surface) | ~6 500 | Gauss (Max) |
Chart 2: Field profile (8 sections)
Chart 3: Temperature performance
Material specification
| iron (Fe) | 64% – 68% |
| neodymium (Nd) | 29% – 32% |
| boron (B) | 1.1% – 1.2% |
| dysprosium (Dy) | 0.5% – 2.0% |
| coating (Ni-Cu-Ni) | < 0.05% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of rare earth magnets.
Advantages
- They do not lose power, even after around 10 years – the reduction in power is only ~1% (based on measurements),
- They are resistant to demagnetization induced by external disturbances,
- By using a smooth coating of nickel, the element has an aesthetic look,
- They feature high magnetic induction at the operating surface, which increases their power,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
- Thanks to the option of precise shaping and adaptation to unique projects, magnetic components can be manufactured in a wide range of geometric configurations, which increases their versatility,
- Huge importance in modern technologies – they are used in HDD drives, electric motors, medical equipment, and complex engineering applications.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Weaknesses
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- We suggest casing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated shapes.
- Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
- With mass production the cost of neodymium magnets can be a barrier,
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what it depends on?
- on a base made of structural steel, perfectly concentrating the magnetic field
- possessing a massiveness of minimum 10 mm to avoid saturation
- characterized by smoothness
- under conditions of ideal adhesion (surface-to-surface)
- for force applied at a right angle (in the magnet axis)
- in neutral thermal conditions
What influences lifting capacity in practice
- Air gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
- Direction of force – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Chemical composition of the base – mild steel gives the best results. Alloy steels lower magnetic permeability and holding force.
- Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
- Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was measured with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet and the plate reduces the load capacity.
Safety rules for work with neodymium magnets
Warning for heart patients
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Adults only
Neodymium magnets are not intended for children. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and requires immediate surgery.
Compass and GPS
Remember: neodymium magnets produce a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.
Permanent damage
Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Dust is flammable
Machining of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Cards and drives
Device Safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).
Magnet fragility
NdFeB magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them breaking into shards.
Warning for allergy sufferers
Some people experience a contact allergy to Ni, which is the common plating for neodymium magnets. Frequent touching may cause dermatitis. It is best to use safety gloves.
Safe operation
Exercise caution. Rare earth magnets act from a distance and connect with huge force, often faster than you can move away.
Pinching danger
Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!
Tabela kosztu i czasu dostawy
Płatność przed wysyłką:
GLS kurier
Przesyłka będzie u Ciebie za 2-3 dni
14.99 ZŁ
InPost Paczkomaty 24/7
Przesyłka będzie u Ciebie za 1-2 dni
12.30 ZŁ
Płatność przy odbiorze (pobranie):
GLS kurier
Przesyłka będzie u Ciebie za 1-2 dni
23.00 ZŁ
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