C-TPAT: Container + Trailer Seals

As a certified C-TPAT company, we are committed to educating all our Business Partners on critical supply chain security issues and practices.

We recommend all vendors, carriers, freight forwarders and third party logistics providers use high security seals on all containers bound for the United States in order to achieve optimum container security. All high security seals used for the international transportation of products into the U.S.A. should be of the high security type as per ISO guidelines (ISO/ PAS 17712, Freight Containers Mechanical Seals) adopted May 2003.


We recommend the following procedures for the maintenance, issuance, placement, and inspection of seals:

Seal Maintenance
  • Verify seals received from the seal vendor for correct quantity and check for damage.
  • Report any shortages or overages and document any missing seals in a log. Store seals in a locked cabinet with no more than two keys (one for the warehouse manager and one for a designated employee). If seals are found damaged, dispose of the seals and document on the log.
Seal Issuance
  • When a shipment is scheduled and paper work is ready, document seal number on a log and issue seal only to the designated person for placement on the container.
Seal Placement
  • When a container has been loaded, close container doors and place seal. Tug the seal from opposite ends to test integrity.
Seal Inspection
  • As the container leaves the facility, have a designated employee or security guard inspect the container and the seal for matching, integrity or evidence of tampering.
  • Immediately report to management any anomalies found during the inspection and hold the shipment pending further investigation.

Another quick tip is to follow VVTT protocol whenever implementing container security:
V – View seal & container locking hardware
V – Verify seal number
T – Tug on seal to make sure it’s on right
T – Twist & turn seal to make sure it doesn’t unscrew


In case of any security incidents, involving your cargo, immediately report to the appropriate law enforcement agency.

Please contact us for assistance in reporting an anomaly to CBP.


For questions or comments on any supply chain security issues, please contact: ctpat@casasinternational.com


We strongly recommend you forward and share this information to all your vendors, carriers, freight forwarders, and third party logistics providers involved in  the supply chain.


We encourage all business partners and other eligible companies to join C-TPAT or your country’s supply chain security program. For further information on C-TPAT, please click here.

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