SM 25x150 [2xM8] / N42 - magnetic separator
magnetic separator
Catalog no 130289
GTIN: 5906301812821
Diameter Ø [±0,1 mm]
25 mm
Height [±0,1 mm]
150 mm
Weight
0.01 g
393.60 ZŁ with VAT / pcs + price for transport
320.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Magnetic properties of material N42
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Strengths and weaknesses of neodymium magnets.
Besides their immense pulling force, neodymium magnets offer the following advantages:
- Their magnetic field is maintained, and after approximately 10 years it decreases only by ~1% (theoretically),
- They are resistant to demagnetization induced by presence of other magnetic fields,
- The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to look better,
- They show high magnetic induction at the operating surface, which affects their effectiveness,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of individual creating as well as optimizing to concrete requirements,
- Wide application in innovative solutions – they are used in hard drives, electromotive mechanisms, medical devices, as well as complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Disadvantages of neodymium magnets:
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We recommend a housing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex forms.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is economically unviable,
Breakaway strength of the magnet in ideal conditions – what it depends on?
Holding force of 0 kg is a theoretical maximum value conducted under standard conditions:
- using a sheet made of low-carbon steel, acting as a ideal flux conductor
- whose thickness reaches at least 10 mm
- with a surface cleaned and smooth
- with zero gap (without paint)
- under vertical force vector (90-degree angle)
- at standard ambient temperature
Practical aspects of lifting capacity – factors
Holding efficiency is affected by working environment parameters, such as (from most important):
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Load vector – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Plate material – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
- Heat – 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).
* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.
Safety rules for work with neodymium magnets
Mechanical processing
Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Physical harm
Big blocks can crush fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.
Skin irritation risks
Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, refrain from direct skin contact and opt for versions in plastic housing.
Handling rules
Handle magnets consciously. Their powerful strength can shock even professionals. Stay alert and do not underestimate their power.
Electronic devices
Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
Health Danger
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Power loss in heat
Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.
Fragile material
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Magnetic interference
An intense magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.
Swallowing risk
These products are not intended for children. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.
Danger!
Looking for details? Check our post: Why are neodymium magnets dangerous?
