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JM 15x40 - jajka w pudełku/cena za parę - magnetic eggs

magnetic eggs

Catalog no 270212

GTIN/EAN: 5906301814405

5.00

Weight

77 g

7.00 with VAT / pcs + price for transport

5.69 ZŁ net + 23% VAT / pcs

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Lifting power and structure of a neodymium magnet can be tested on our online calculation tool.

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Technical of the product - JM 15x40 - jajka w pudełku/cena za parę - magnetic eggs

Specification / characteristics - JM 15x40 - jajka w pudełku/cena za parę - magnetic eggs

properties
properties values
Cat. no. 270212
GTIN/EAN 5906301814405
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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

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
Technical specification and ecology
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
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 270212-2025
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Other products

When you toss them close together, magnetic force attracts them, and they bounce and reconnect in flight hundreds of times per second. This sound is the result of unique shape and magnetism, making them a great show gadget.
Magnetic eggs are usually made of hematite (synthetic ceramic material with ferromagnetic properties) or strong anisotropic ferrite. The surface is perfectly smooth, enabling rapid collisions without much friction.
Dropping on concrete from a height can cause a piece of magnet to chip or break in half. Although they look like a toy, they are strong magnets that should be kept away from electronics, watches, and payment cards.
It's an excellent "icebreaker" in the office and an interesting scientific gift for the curious. You can juggle them, spin tops, or use them as very strong fridge magnets.
Buying one set (piece in the store), you receive two oval magnets (eggs). The packaging protects magnets during transport from hitting each other.

Strengths as well as weaknesses of rare earth magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • Neodymium magnets remain extremely resistant to demagnetization caused by external interference,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in designing and the ability to customize to unusual requirements,
  • Significant place in high-tech industry – they are used in computer drives, electric motors, advanced medical instruments, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in small systems

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. Additionally, small elements of these magnets can 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

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat it depends on?

The lifting capacity listed is a result of laboratory testing conducted under specific, ideal conditions:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by even structure
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

In real-world applications, the real power is determined by a number of factors, presented from crucial:
  • Gap (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Direction of force – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Alloy steels reduce magnetic properties and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Allergy Warning

It is widely known that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact or choose encased magnets.

Electronic hazard

Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Magnet fragility

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Pinching danger

Danger of trauma: The attraction force is so great that it can cause hematomas, crushing, and broken bones. Use thick gloves.

This is not a toy

Product intended for adults. Tiny parts can be swallowed, causing intestinal necrosis. Keep out of reach of kids and pets.

Warning for heart patients

People with a heart stimulator have to maintain an absolute distance from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Fire warning

Fire hazard: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Do not underestimate power

Exercise caution. Neodymium magnets act from a long distance and snap with massive power, often faster than you can react.

Precision electronics

Note: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your phone, device, and navigation systems.

Power loss in heat

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Danger! Want to know more? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98