Seal

A seal is a one-time locking device used in foreign trade logistics to secure containers, trucks, air boxes, and other transport units. It is usually made of metal or plastic and bears a unique number. Its core function is to ensure that goods are not opened without authorization during transportation and to serve as a handover credential. Usage scenarios include: after loading a container, the shipper applies a seal, and the carrier verifies the number upon receipt; customs applies a customs seal after inspection; the consignee checks the seal's integrity when picking up the goods. Precautions: the seal number must match the bill of lading, packing list, and other documents; if the seal is damaged or the number does not match, the consignee should refuse delivery, take photos as evidence, and claim compensation from the carrier. Difference from 'lead seal': a lead seal is a traditional material for seals, and now the general term is seal. Difference from 'lock': a seal is one-time use and cannot be restored after opening, while a lock can be reused. Foreign trade practitioners need to clarify seal responsibilities in the contract to avoid cargo damage disputes.