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
0.01 g
Magnetic Flux
~ 6 500 Gauss [±5%]
615.00 ZŁ with VAT / pcs + price for transport
500.00 ZŁ net + 23% VAT / pcs
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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 | 0.01 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 |
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Pros as well as cons of Nd2Fe14B magnets.
Pros
- Their magnetic field remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
- They possess excellent resistance to magnetism drop when exposed to external fields,
- Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
- Magnetic induction on the surface of the magnet turns out to be extremely intense,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of individual shaping as well as adjusting to precise needs,
- Key role in modern technologies – they serve a role in HDD drives, electromotive mechanisms, medical equipment, and other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
- Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum holding power of the magnet – what contributes to it?
- on a block made of mild steel, effectively closing the magnetic flux
- with a thickness no less than 10 mm
- with a surface cleaned and smooth
- under conditions of ideal adhesion (surface-to-surface)
- under perpendicular application of breakaway force (90-degree angle)
- at temperature approx. 20 degrees Celsius
What influences lifting capacity in practice
- Distance (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.
Do not overheat magnets
Watch the temperature. Heating the magnet to high heat will ruin its magnetic structure and pulling force.
Physical harm
Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.
Electronic devices
Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.
Respect the power
Be careful. Neodymium magnets act from a long distance and connect with huge force, often faster than you can move away.
Medical implants
Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Nickel coating and allergies
Some people experience a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact may cause a rash. We strongly advise wear safety gloves.
Risk of cracking
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them shattering into shards.
GPS and phone interference
Be aware: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, device, and navigation systems.
Machining danger
Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.
Choking Hazard
Only for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Keep away from children and animals.
