# Mechanical seals for tanker freight containers

*Last updated: 2026-06-26*

> A freight forwarder takes over a tank container after a long sea voyage—and finds the seal broken.

A freight forwarder takes over a tank container after a long sea voyage—and finds the seal broken. Mechanical seals for tank containers are physical locking devices fitted to a container's closure points to make unauthorized access immediately visible and verifiable. Available in single-use or reusable designs, they are applied before departure and checked upon arrival. A broken or missing seal triggers consequences in customs clearance and supports—or complicates—insurance claims. ISO 17712 sets the international standard for mechanical strength and security features, distinguishing between high-security seals and lower-rated alternatives. For hazardous goods and food-grade shipments, regulatory frameworks frequently mandate their use.

**Source:** [https://www.iso.org/standard/55656.html](https://www.iso.org/standard/55656.html)

## Quick Facts

| Property | Value |
|---|---|
| Term | Mechanical seals for tanker freight containers |
| Language | EN |
| Word count | 100 |
| Last updated | 2026-06-26 |
| Source | https://www.iso.org/standard/55656.html |

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