Magnetic Cargo
Goods with magnetism; air transport requires a magnetic test within field-strength limits, and strongly magnetic items may be classed as Class 9 dangerous goods.
Magnetic Cargo refers to goods containing magnetic material or producing a magnetic field, such as speakers, magnets, motors and electronics with magnetic-attachment structures. Magnetic fields can interfere with aircraft navigation and instruments, so air transport imposes field-strength limits: goods exceeding the prescribed threshold are handled as IATA Class 9 (miscellaneous) dangerous goods and require a magnetic test with a test report, while weakly magnetic goods may move as general or sensitive cargo after suitable packaging/shielding.
- 合规要件：是否构成航空危险品取决于在规定距离处测得的磁场强度，常需「磁检报告」证明在限值内；具体阈值与判定以 IATA DGR 及承运渠道要求为准。
- 责任/费用边界：磁检与合规包装责任在发货方；带磁货通常加收附加费并限定渠道，海运相对宽松。
- 常见坑：把带磁吸/喇叭/磁铁的产品当普货走空运，被磁检拦截后退仓、补检甚至改走海运，耽误交期；强磁产品包装时未做屏蔽也可能超标。
FAQ
- Can my speakers / magnet products simply fly as air cargo?
- You first need a magnetic test confirming the field strength is within limits. Compliant weakly magnetic goods can use designated channels (often with a surcharge); over-limit goods are treated as Class 9 dangerous goods, and some channels require shielded packaging or refuse them. Test the magnetism and prepare a magnetic test report before shipping.
- Does magnetic cargo need a magnetic test for sea freight too?
- The aircraft-interference concern is the main reason for air-transport limits; sea freight is comparatively lenient on magnetic cargo and usually does not mandate a magnetic test. If the same product may also need air transport, it is still advisable to test in advance for channel review. Follow the carrier's specific requirements.
Sources: https://www.iata.org/en/programs/cargo/dgr/ · https://www.dhl.com/global-en/home/our-divisions/freight.html