JM 15x40 - jajka w pudełku/cena za parę - magnetic eggs
magnetic eggs
Catalog no 270212
GTIN/EAN: 5906301814405
Weight
77 g
7.00 ZŁ with VAT / pcs + price for transport
5.69 ZŁ net + 23% VAT / pcs
bulk discounts:
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Product card - JM 15x40 - jajka w pudełku/cena za parę - magnetic eggs
Specification / characteristics - JM 15x40 - jajka w pudełku/cena za parę - magnetic eggs
| properties | values |
|---|---|
| Cat. no. | 270212 |
| GTIN/EAN | 5906301814405 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Weight | 77 g |
| Manufacturing Tolerance | ±1 mm |
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of rare earth magnets.
Strengths
- They do not lose power, even after approximately ten years – the decrease in power is only ~1% (theoretically),
- They possess excellent resistance to magnetism drop due to external fields,
- Thanks to the shimmering finish, the surface of Ni-Cu-Ni, gold, or silver gives an professional appearance,
- They feature high magnetic induction at the operating surface, which increases their power,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of custom creating as well as adjusting to atypical needs,
- Versatile presence in advanced technology sectors – they find application in HDD drives, brushless drives, precision medical tools, also complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 very resistant to heat
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in realizing nuts and complex forms in magnets, we propose using cover - magnetic mechanism.
- Health risk to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- using a base made of low-carbon steel, acting as a magnetic yoke
- with a cross-section no less than 10 mm
- with an ground touching surface
- with zero gap (without paint)
- for force applied at a right angle (pull-off, not shear)
- in temp. approx. 20°C
Practical aspects of lifting capacity – factors
- Clearance – existence of foreign body (paint, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
- Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Plate material – low-carbon steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
- Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
- Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the holding force.
Safe handling of NdFeB magnets
Skin irritation risks
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness occurs, cease working with magnets and wear gloves.
Data carriers
Data protection: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).
ICD Warning
Individuals with a ICD have to maintain an absolute distance from magnets. The magnetic field can stop the functioning of the implant.
Safe operation
Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.
Keep away from electronics
Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a strong magnet can decalibrate the internal compass in your phone.
Choking Hazard
NdFeB magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and requires urgent medical intervention.
Do not overheat magnets
Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. This process is irreversible.
Bodily injuries
Mind your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!
Fire warning
Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.
Beware of splinters
Neodymium magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them cracking into small pieces.
Tabela kosztu i czasu dostawy
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Płatność przy odbiorze (pobranie):
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23.00 ZŁ
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