How to Delivery Super Strong Magnets By Air

How can we shield a magnet package? At present, a common iron sheet is the main material to shield the magnetic field.

Magnetic shielding requires high permeability material. Ferronickel is such type material which can meet the requirement.

If magnet goods past inspection and have Identification and Classification Report for Air Transport of Goods, then strong rare earth magnet can be sent by air. Into order to past the inspection requirement by IATA (International Air Transport Association) DGR, we need to do some special treatment for the package.

magnet package

Due to the interference of weak stray magnetic fields on the navigation system and the control signal of the aircraft, IATA listed magnetic goods as Class 9 dangerous goods and meanwhile limited its delivery. For this reason, have you ever wondered about how to delivery super strong rare earth magnets by air?

Under the terms of the IATA DGR: if the maximum magnetic field strength of any air cargo is less than 0.159A / m (200nT) with distance 2.1m (7ft) away from the outer surface of the package, then this item can be treated as normal cargo to be airlifted, and is not subject to any restriction of magnetic substance.

Please pay attention that there must be a gap between the iron sheet and the magnet. And you can fill the air gap with any nonmagnetic material as support.

super strong rare earth magnet

For larger size magnet, it is difficult to reach total shielding requirements only by a single layer of shielding material. We have two other ways to solve this problem. One is increasing the thickness of the iron plate.

The other is a combination of shielding, putting one shielding into another shielding, leaving a certain gap between them. Combination of shielding is much better than single layer shielding which can reduce magnetic field to a low level.

The magnet for air transportation from Stanford Magnet is well packed by iron boxes. And we have excellent special express forwarders who help us to send magnets safely for many years. Low express cost and fast delivery time are available. If you have any requirement for magnet or magnet assemblies such as Halbach array, voice coil motor, please contact us freely.

For more information, please visit https://www.stanfordmagnets.com/

Why Does A Magnet Have Magnetism

There is a magnetic field around the magnet.

There is a magnetic field around the magnet, and the interaction between the magnets is mediated by the magnetic field. The magnetic field is a kind of special material that can not be seen or touched. The magnetic field is not composed of atoms or molecules, but it exists objectively. The magnetic field has the radiation characteristics of wave particles.

Since the magnetism of a magnet originates from current, which is the motion of charge, it is generally said that the magnetic field is generated by moving charge or changing electric field.

There is a magnetic field around the rare earth magnet. The interaction between the magnets is mediated by the magnetic field, so the two magnets can work without contacting.

Magnetic field characteristics

A magnetic field is a substance that exerts a magnetic force on the magnet placed in it. The basic characteristic of the magnetic field is that it can exert a force on the moving charges, that is, the electrified conductor is subjected to the force of the magnetic field in the magnetic field. This is why the magnetic field acts on the current, the force on the magnet or the force distance.

The magnetic field is a kind of special material that can not be seen or touched. The magnetic field is not composed of atoms or molecules, but it exists objectively. The magnetic field has the radiation characteristics of wave particles.

Charge and current movement produces the magnetic field

Principle of magnetic field generation

Modern physics has proved that the ultimate structure of any substance is composed of electrons (with unit negative charge), protons (with a unit positive charge) and neutrons (with an external display of electric neutrality). A point charge is a material point containing excess electrons (with unit negative charge) or protons (with a unit positive charge). Therefore, the reason why current produces magnetic field can only be attributed to the magnetic field generated by moving electrons.

Charge movement produces a magnetic field, electric current also produces the magnetic field. There are magnetic fields around the wires. Unlike atoms, the magnetic field is invisible and intangible. It generates magnetic field conditions. Charge movement is just like the principle that weight is absorbed on the earth.

magnetic field

The magnetic field is energetic.

The magnetic field generated by moving charge or changing electric field, or the total magnetic field is a passive and rotating vector field, and the magnetic lines are closed curve clusters, uninterrupted and uncrossed. The magnetic field is a rotational field rather than a potential field (conservative field), and there is no scalar function similar to the potential.

The electric field is an active irrotational vector field.

Geomagnetic field

The earth’s magnetic field comes from the inner part of the earth. The solid is surrounded by molten liquid iron and nickel. The movement of the earth’s center in the liquid metal produces electric current and forms the earth’s magnetic field. The magnetic field shielded the cosmic rays, mainly attacked by solar storms, and protected the continuity of life on Earth. Scientists have found that when volcanic magma solidifies, iron is always arranged in the direction of the magnetic field. Experts call this phenomenon geodynamics, and the earth’s magnetic field is dominated by the earth’s power.