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.
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.
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/