Seal Number
Also known as: Container Seal, Security Seal, Cargo Seal Number
Definition
A seal number is a unique identifier on a tamper-evident device used to secure shipping containers, trailers, or cargo. Recording and verifying seal numbers ensures that shipment contents haven’t been accessed or tampered with during transit.
Types of Seals
| Type | Security Level | Application |
|---|---|---|
| Indicative | Low | Plastic strap, deters casual tampering |
| Security | Medium | Metal bolt, requires tools to remove |
| High-security | High | ISO 17712 compliant, resists attacks |
| Electronic | Highest | Transmits alerts if tampered |
Seal Number Process
- Application - Seal applied at origin after loading
- Documentation - Number recorded on bill of lading
- Transit - Seal remains intact throughout journey
- Verification - Receiver confirms seal number matches
- Removal - Seal cut only after verification
- Recording - Document seal removal and condition
Why Seal Numbers Matter
Security
- Proof of non-tampering
- Theft deterrent
- Customs compliance requirement
Accountability
- Chain of custody documentation
- Dispute resolution evidence
- Insurance claim support
International Requirements
- C-TPAT - US Customs-Trade Partnership Against Terrorism
- AEO - EU Authorized Economic Operator
- ISO 17712 - International standard for high-security seals
Seal Verification Best Practices
- Compare seal number against shipping documents
- Inspect seal for signs of tampering
- Check seal type matches expectations
- Photograph seal before removal
- Report discrepancies immediately
- Retain removed seals as evidence if issues
Electronic Seals
Advanced e-seals offer:
- GPS location tracking
- Real-time tamper alerts
- Temperature/humidity monitoring
- Remote seal status verification
- Automated documentation
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