The Ultimate Guide to Shipping Container Markings, CSC Plates & Survey Certificates: What You Need to Know

When exporting a shipping container also known as – Conex Box – Cargo Container, Intermodal Container or Sea Can, it’s essential to understand the various markings, certifications, and plates that ensure compliance, safety, and structural integrity.

The 1972 the International Convention for Safe Containers (CSC) established by the International Maritime Organization (IMO), set global safety and inspection standards for shipping containers. It ensures containers are structurally sound, properly inspected, and safe for transport overseas.

Key Accomplishments of the International Convention for Safe Containers (CSC) 

1. Set Universal Safety Standards – Established design, construction, and maintenance requirements to prevent structural failures and accidents.
2. Mandated CSC Plates – Requires every container to have a CSC Plate displaying weight limits, stacking capacity, and inspection records.
3. Required Periodic Safety Inspections – Initially, the first inspection is required within five years of the container’s manufacture date. Thereafter, inspections must be conducted at least every 30 months (2.5 years) to verify structural integrity, check fA CSC plate, also known as a Combined Safety Certificate plate, is a standardized metal plate permanently affixed to the doors of an ISO shipping container. Its primary purpose is to indicate whether the container is approved for safe international transport.
4. In addition, the CSC plate displays essential safety details, including the container’s date of manufacture, maximum allowable weight, and the next examination date (NED).
5. Overall, the CSC plate plays a critical role in the Convention for Safe Containers (CSC), which establishes global safety standards for ISO shipping containers used in international trade.or corrosion or damage, and confirm compliance with CSC safety standards.
6. Enhanced Global Shipping Safety – Reduced accidents, cargo loss, and delays by enforcing strict compliance across all shipping nations.

Shipping Container Markings Explained

1. Container Number- A shipping container number consists of a four-letter prefix (owner code and equipment category) followed by a six-digit serial number and a check digit, ensuring unique identification and facilitating accurate tracking
   • Owner Code (First 3 Letters): Identifies the owner or operator of the container.
   • Equipment Category Identifier (Fourth Letter): “U” typically indicates a freight container, while “J” is for detachable freight container and “Z” for trailers and chassis.
   • Serial Number (Next 6 Digits):  A 6-digit unique serial number assigned to each container by the owner.

2. Check Digit – A digit used to validate the accuracy of the owner code and serial number.

3. Iso Code- A 4-character sequence indicating container dimensions and type.
   • The first digit identifies the container’s length (for example, “2” represents a 20-foot container).
   • The second digit indicates the container’s height (for example, “5” refers to a 9’6” high-cube container).
   • The remaining letters and numbers specify the container type, such as “G1” for a general-purpose container or “U1” for an open-top container.

4. Weight & Capacity Panel – Includes:
   • Maximum Gross Weight (total allowable weight, ~30 metric tons).
   • Tare Weight (empty container weight, 4-10 metric tons).
   • Payload (maximum cargo weight = gross weight minus tare weight).
   • Maximum Cargo Volume (important for bulky but lightweight cargo).

5. Height Warning– Height markings are required on shipping containers exceeding 8 ft., 6 in.in height. They typically appear as measurement figures on a yellow background with a black outline and are positioned in the right-hand corner of each side of the container.

6. CSC Plate- A CSC (Convention for Safe Containers) plate is a safety approval plate affixed to a shipping container, certifying that it meets the International Convention for Safe Containers (CSC) standards. It is typically a metal plate located near the container doors and contains key structural and safety information.

7. Warning & Handling Instructions- Provides safety guidelines for loading, unloading, stacking, and transportation of container to ensure proper handling and prevent damage or accidents.

These markings help track, transport, and verify containers worldwide, ensuring efficiency and compliance in international shipping

CSC Plate and what it looks like?

Let’s take a closer look at the Convention for Safe Containers (CSC) plate. This safety certification plate is mandatory for all containers used in international shipping, confirming that the unit has been inspected, meets structural integrity standards, and is safe for transport under heavy loads and harsh conditions.

Where Do You Find a CSC Plate?

1. What is a CSC Plate?
   • A CSC plate, also known as a Combined Safety Certificate plate, is a standardized metal plate permanently affixed to the doors of an ISO shipping container. Its primary purpose is to indicate whether the container is approved for safe international transport.
   • In addition, the CSC plate displays essential safety details, including the container’s date of manufacture, maximum allowable weight, and the next examination date (NED).
   • Overall, the CSC plate plays a critical role in the Convention for Safe Containers (CSC), which establishes global safety standards for ISO shipping containers used in international trade.

What Information Does a CSC Plate Contain?

A CSC plate typically includes:

• Approval Reference Number – Identifies the issuing regulatory body.
• Date of Manufacture – Indicates when the container was built.
• Owner & Manufacturer Details – Specifies who owns and produced the container.
• Container Identification Number – Matches the unique ID found on the container itself.
• Maximum Gross Weight – The highest allowable weight, including cargo.
• Allowable Stacking Weight – How much weight the container can support when stacked.
• Racking Test Load Value – Confirms the container’s ability to withstand sideways pressure.
• Next Inspection Date – If applicable, the date of the next required safety check.

When Should a Container Be Inspected?

• Before Export – Ensure compliance with CSC safety regulations.
• If Damaged – Any structural damage must be inspected and repaired.
• After Modifications – Any container that has been altered (e.g., adding doors, windows, or reinforcements) must be re-certified.
• For Leasing or Sale – To verify the container is safe and cargo-worthy.

Why Update a CSC Plate?

• CSC plates have an expiration date, typically 5 years from the date of manufacture for single-trip units. They require periodic renewal through inspection and recertification.
• Even if the container is under an Approved Continuous Examination Program (ACEP), it still needs to be inspected and recertified to ensure it remains safe for transport.
• If a container is modified or damaged, a new inspection is required before the CSC plate’s expiration date to ensure continued safety.

How to Update a CSC Plate

• Contact an Industry Professional:  You need to contact a company or organization that specializes in container inspections and recertification.
• Detailed Inspection:  The inspector will conduct a thorough examination of the container’s structural integrity, looking for any damage, corrosion, or other issues that could compromise safety.
• Recertification:  If the container passes inspection, the inspector will issue a new CSC plate or update the existing one with a new Next Examination Date (NED).
• Documentation: Ensure all necessary documentation, including previous inspection records, is complete and available.

Failure to comply with CSC inspection requirements can lead to shipping delays, fines, or rejection at ports.  A valid CSC plate ensures your container is safe, compliant, and ready for international transport. Whether buying, leasing, or shipping a container, always check the CSC plate for certification details.

Survey Certificate is Essential for Export Shipping Containers

A survey certificate for a shipping container is issued by a certified container inspector or marine surveyor, it is an official document confirming that the container meets safety and shipping standards. These professionals work under industry regulations and guidelines.

What is Included in a Shipping Container Survey Certificate?

It typically includes the following details:

1. Container Identification & Details
   • Container Number
   • Size & Type (e.g., 20’ Standard, 40’ High Cube)
   • Owner/Lessor Information
   • Manufacture Date & CSC Plate Verification
2. Structural Condition & Inspection Findings
   • Exterior Condition – Checks for dents, rust, corrosion, and integrity of panels.
   • Interior Condition – Ensures no leaks, flooring damage, or contamination.
   • Doors & Seals – Verifies they open/close properly and are watertight.
   • Roof & Corner Posts – Inspected for cracks, bends, or major damage.
   • Floor Load Capacity – Ensures it can handle cargo weight safely.
3. Certification & Compliance
   • Cargo Worthy Certification (CW) – Confirms it meets international shipping standards.
   • IICL or Wind & Watertight (WWT) Rating – If applicable.
   • Surveyor’s Name & Certification Number – Identifies the authorized inspector.
   • Inspection Date & Validity Period
4. Remarks & Recommendations
   • Notes on repairs needed (ALL REPAIRS MUST BE COMPLETED).
   • Approval for export or rejection based on findings.

This certificate is essential for shipping lines and customs clearance, ensuring that the container is safe, compliant, and ready for transport

When exporting a shipping container, ensuring it meets safety, compliance, and certification requirements is crucial to avoid costly delays and regulatory issues. Container Sales Group specializes in export container preparation, providing certified, cargo-worthy containers that meet CSC, ISO, and IICL standards.

Need a Certified Container for Export? We’ve Got You Covered

Since 1998 Container Sales Group has worked with freight forwarders and third parties looking to export thier goods overseas to supply New/One-Trip, Cargo Worthy and IICL-certified containers. We also have a network of Container Surveyors to provide a certified CSC Survey Certificate to ensure compliance on all of our conex boxes. Call us today at 888-320-5938 to learn more.

We take pride in offering honest pricing, fast response times, and exceptional customer service, ensuring our customers receive high-quality intermodal containers at direct, wholesale prices.