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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

technical details »

7.00 ZŁ with VAT / pcs + price for transport

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Physical properties - 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
Engineering data and GPSR
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
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: 270212-2026
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Magnet pull force
Magnetic Field
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Singing magnets (also known as chirping eggs or Singing Magnets) are two strong oval-shaped magnets that collide with each other when thrown into the air. It is a fascinating physical phenomenon that entertains, teaches, and attracts attention.
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.
These magnets are hard as ceramic and can crack when dropped on a hard surface (e.g., tiles, concrete). The product is not suitable for small children due to the risk of pinching fingers or bruising upon falling.
It serves for dexterity play, performing manual tricks, and simple experiments with magnetism. Playing with them is engaging, and the sound gives sensory satisfaction.
The set consists of two pieces perfectly matching each other in weight and dimensions. Magnets are usually packed in a blister or aesthetic cardboard box (check description).

Advantages and disadvantages of rare earth magnets.

Pros

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They retain attractive force for nearly 10 years – the drop is just ~1% (according to analyses),
  • Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the smooth finish, the plating of nickel, gold, or silver-plated gives an clean appearance,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to modularity in constructing and the capacity to modify to individual projects,
  • Huge importance in electronics industry – they are used in mass storage devices, drive modules, medical devices, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Limitations

Characteristics of disadvantages of neodymium magnets: application proposals
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • 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.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using a housing - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what it depends on?

The force parameter is a measurement result executed under the following configuration:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • whose thickness is min. 10 mm
  • characterized by lack of roughness
  • without any clearance between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Real force is affected by working environment parameters, such as (from priority):
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safe handling of neodymium magnets
Physical harm

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Magnetic media

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Dust explosion hazard

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Fragile material

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Allergic reactions

A percentage of the population suffer from a sensitization to Ni, which is the common plating for NdFeB magnets. Extended handling can result in dermatitis. It is best to wear protective gloves.

Caution required

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Maximum temperature

Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Magnetic interference

GPS units and smartphones are highly susceptible to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.

Danger to pacemakers

For implant holders: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

This is not a toy

NdFeB magnets are not suitable for play. Eating a few magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires immediate surgery.

Caution! More info about hazards in the article: Safety of working with magnets.