What Are the Port and Customs Requirements for Container Seals?

Jan 04,2025
Industry News
Where should container seals be affixed? What happens if a shipping security seal is tampered with? What is the correct way to remove container seals

Container seals play a vital role in ensuring the security and integrity of goods shipped across borders. Whether it is a container used to transport raw materials or finished products, a strong seal is required to ensure the security and integrity of the goods inside. In this article, we will address some of the most common pain points and questions about shipping container seals and provide insights from the perspective of third-party fulfillment service providers.

Common Container Seals

Unsure about choosing the right type of container seal: With so many types of seals to choose from, choosing the right one can be confusing.

Complying with port and customs requirements: Regulations for container seals can vary from region to region and port to port, making compliance difficult.

Tampered seals: Tampering with shipping container seals can result in significant delays, fines, or even confiscation of cargo. .

Improper seal placement: Misplaced container seals can cause customs to question the integrity of the cargo and delay the shipment of cargo.

Proper removal and disposal: Improper removal or disposal of container seals can result in delays or fines.

With these questions in mind, let’s break down the key issues regarding container sealing and explore how to effectively address them.

What are container seals?

Container seals, also known as shipping container security seals, are security devices that secure container doors and ensure that cargo remains intact during transportation. Prevent unauthorized access or tampering with its contents during transportation. Seals are essential to maintaining the integrity of cargo, especially when shipping internationally. They serve as a physical means of preventing tampering and theft, and provide evidence of any unauthorized access during transportation.

shipping container seals

Container seals often carry a unique identification number to ensure that the container’s journey can be traced. These seals help shippers and consignees verify that the container has not been tampered with or damaged. Container seals are used for all types of transportation, including sea, air, and land transport.

Where should container seals be affixed?

The seal should be placed in a clearly visible location on the container door to ensure easy inspection. The most common location is on the locking device or hasp, so that it can be clearly seen by customs authorities and consignees at the destination port.

The seal must also be affixed in a way that ensures that if it is tampered with, it is immediately visible. If the seal is improperly positioned or damaged, it may arouse suspicion, leading to customs delays or even rejection of the shipment.

On container doors: Seals should be placed around the locking mechanism of container doors to prevent unauthorized access.

At the entrance of the container: For shipping containers with multiple entry points, the seal should be placed in the most secure position to prevent tampering.

Compliance with international standards: Depending on the country or region of shipment, port and customs regulations may have specific placement requirements.

What types of container seals are there?

There are many types of container seals, each providing a different level of security depending on the type of cargo being transported and the security requirements. The main types include:

Bolt seals

These are high-security seals with tamper-evident features. Bolt seals are tamper-evident and are used for high-security cargo. They require bolt cutters to remove, making them difficult to tamper with. They are used to protect high-value cargo and are often favored by customs authorities.

Cable seals

Cable seals are flexible and easy to use, suitable for less sensitive cargo. Cable seals can be used on containers with different locking mechanisms.

Wire seals

Wire seals are similar to cable seals, but are used for smaller containers or smaller cargo. Wire seals are more flexible than bolt seals but still provide a reasonable level of security.

Plastic seals

Plastic seals are less secure than bolt or wire seals and are often used for lower-value shipments. These seals are more cost-effective, but are less secure than bolt or cable seals and can be easily broken or cut.

Combination seals

These seals are both tamper-resistant and provide a unique identification number for easy tracking and auditing.

Metered seals

These seals contain a built-in mechanism that counts each use, helping to prevent unauthorized removal.

Electronic seals

These advanced seals use electronic technology to track and monitor the condition of the container during transportation. Electronic seals provide real-time data, making them an excellent choice for high-value shipments.

Choosing the right type of seal for your container depends on the level of security required, the nature of the goods being transported, and the regulations of port and customs authorities.

Port and customs requirements for container seals

In order to pass customs, each container must be affixed with at least one seal. The maximum number of seals generally allowed is six due to the number of keyholes in the container door. Regulations require these seals to meet specific standards recognized by customs authorities around the world.

Different countries and ports have their own requirements for container seals, and compliance with these regulations is critical to avoid delays, fines, or cargo seizures. Port and customs requirements for container seals are designed to ensure the security and integrity of cargo during transport and to prevent theft or tampering. Here are some common requirements:

International Standards

Many ports and customs authorities follow International Maritime Organization (IMO) standards, which provide guidelines for the strength and security of seals. These standards often require high-security seals for high-value cargo or hazardous materials.

Seal Registration

Some customs authorities require that seal numbers be recorded and registered when containers are loaded. This is to ensure that the correct seal is in place when the container arrives at its destination.

Tamper-Resistant Features

Many customs authorities, especially in countries where security is a high concern, require seals to be tamper-resistant. Customs often require seals to have tamper-resistant features, such as breaking when tampered with, or leaving a mark on the container.

Seal Inspections

In many international ports, customs authorities conduct random inspections to ensure that container seals are intact and have not been tampered with. If the seal is found to be broken, customs authorities may inspect the contents of the cargo, causing delays.

Seals with unique identification numbers

Some customs authorities require container seals to have a unique ID number that can be tracked and verified. This is often used for high-value or sensitive cargo.

Documentation

Ports may require that the seal number be recorded on shipping documents, such as bills of lading, to ensure it matches the seal on the container.

What happens if a container seal is tampered with?

Customs delays

If customs authorities discover that a seal has been tampered with, they may detain the cargo for further inspection, which can delay the shipping process and increase shipping costs.

Fines and penalties

In some areas, tampering with seals or failure to properly record seal numbers can result in fines and even confiscation of the cargo.

Cargo loss

If tampering is suspected, cargo may be confiscated or destroyed, especially if there are concerns about illegal activity or contraband.

Legal implications

Tampering with seals is considered a security violation and can result in legal action. This is particularly important for businesses involved in shipping high-value goods or regulated products.

To avoid these issues, it’s important to choose high-quality seals, properly secure them to the container, and record the seal number. Working with a trusted third-party fulfillment provider like ChinaDivision ensures that your shipment meets all necessary safety standards and that any potential issues are resolved promptly.

For B2B companies, any disruption in shipping can impact your bottom line. Therefore, ensuring that seals are used and maintained correctly is critical to avoiding unnecessary delays and penalties.

The Correct Way to Remove Container Seals

While this may seem simple, container seals can cause problems if they are not removed correctly. Here are the correct steps:

Verify Documents

Make sure all shipping documents, including bills of lading, match the seal number.

Use the Right Tools

Make sure you have the proper equipment to remove the seal. For example, bolt seals require a special cutter, while plastic seals can be removed with a standard cutter.

Record the Seal Number

Before removing the seal, always record the seal number and check it against the shipping documents to ensure transparency and traceability.

Check for Tampering

After removal, inspect the seal and locking device for signs of tampering. If there are any signs of tampering, please report it to the relevant authorities immediately.

Solving container seal issues through a third-party fulfillment perspective

As a professional third-party logistics service provider, ChinaDivision ensures that all goods are securely sealed and comply with international shipping and customs regulations. Here are the ways we help companies solve container sealing issues:

Expert guidance: Depending on the nature of the goods, we provide customers with detailed advice on the best type of seal to use.

Seal registration and tracking: We help companies keep a record of seal numbers properly to ensure that all goods are properly recorded and comply with customs regulations.

Inspection services: At our fulfillment center, we ensure that all containers are properly sealed before shipment, minimizing the risk of tampering and ensuring a smooth customs clearance process.

Customs compliance: With our experience in international logistics, we ensure that all container seals comply with the requirements of customs authorities at the port of departure and destination.

Efficient seal removal: We provide clear instructions and services for the correct removal and inspection of seals, ensuring that your goods are properly handled after arriving at their destination.

Container seals are more than just a formality, they are a key element to ensure safe, reliable and compliant cross-border cargo transportation. By understanding the definition, types, port and customs requirements, and proper removal methods of container seals, B2B companies can better manage their logistics and transportation processes, reduce risks and improve operational efficiency, avoiding common pain points such as delays, fines, and cargo loss. For companies seeking help, ChinaDivision provides professional solutions for managing container seals to ensure a worry-free logistics process.

If you still have any questions or need help with container seals, please feel free to contact your trusted third-party fulfillment service provider ChinaDivision.

About the Author: Limi

About the Author: Limi

Limi is a content marketing expert at ChinaDivision, helping businesses and e-commerce sellers navigate the complexities of international shipping by providing actionable tips and comprehensive guides on logistics, shipping, and cargo transportation.