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JM 18x60 - jajka bez pudełka/cena za parę - magnetic eggs

magnetic eggs

Catalog no 270213

GTIN/EAN: 5906301814412

5.00

Weight

83 g

see parameters »

8.99 ZŁ with VAT / pcs + price for transport

7.31 ZŁ net + 23% VAT / pcs

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Call us now +48 22 499 98 98 alternatively contact us through request form through our site.
Parameters and appearance of neodymium magnets can be checked on our modular calculator.

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Technical - JM 18x60 - jajka bez pudełka/cena za parę - magnetic eggs

Specification / characteristics - JM 18x60 - jajka bez pudełka/cena za parę - magnetic eggs

properties
properties values
Cat. no. 270213
GTIN/EAN 5906301814412
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 83 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
Elemental analysis
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: 270213-2026
Measurement Calculator
Pulling force
Magnetic Induction
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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.
They are ceramic magnets, carefully polished to a high gloss, giving them a metallic look. These are not classic neodymium magnets, but they are strong enough to generate the sound effect of attraction.
Dropping on concrete from a height can cause a piece of magnet to chip or break in half. 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. It works great as a small gift for someone who likes physics or needs a break while working at the computer.
Buying one set (piece in the store), you receive two oval magnets (eggs). The packaging protects magnets during transport from hitting each other.

Pros and cons of Nd2Fe14B magnets.

Pros

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They retain attractive force for almost ten years – the loss is just ~1% (according to analyses),
  • Magnets perfectly protect themselves against loss of magnetization caused by external fields,
  • In other words, due to the smooth surface of nickel, the element becomes visually attractive,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to modularity in constructing and the ability to modify to client solutions,
  • Universal use in future technologies – they serve a role in data components, drive modules, advanced medical instruments, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions

Cons

Problematic aspects of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power 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 - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
  • Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products can complicate diagnosis medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

The specified lifting capacity represents the maximum value, obtained under ideal test conditions, specifically:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • whose transverse dimension is min. 10 mm
  • with a surface free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • under axial force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Bear in mind that the application force may be lower depending on elements below, starting with the most relevant:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Bodily injuries

Watch your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Safe distance

Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Do not overheat magnets

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and strength.

Choking Hazard

Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.

Warning for allergy sufferers

Studies show that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands or opt for coated magnets.

Safe operation

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Eye protection

Neodymium magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets will cause them breaking into shards.

Medical interference

Patients with a pacemaker should keep an large gap from magnets. The magnetic field can disrupt the functioning of the implant.

Compass and GPS

Note: neodymium magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, device, and GPS.

Fire warning

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

Danger! Details about hazards in the article: Safety of working with magnets.