Shipping dangerous goods by sea is high stakes. One overlooked detail in your classification, paperwork, or packing can result in shipment delays, serious fines or even marine incidents.
As IMDG Code Amendment 42-24 takes full effect in 2025, staying compliant is no longer optional. This post breaks down the top 7 mistakes companies still make, and how to avoid them with proper training, tools, and systems.
1. Misclassifying the Goods
Incorrect UN numbers, hazard classes, or packing group designations are still one of the most common causes of delays and refusals. This is especially true for lithium batteries and mixed substances under the latest IMDG changes.
✅ Fix: Use up-to-date SDSs, consult the latest IMDG Code tables, and validate classification with a trained DGSA.
2. Incorrect or Incomplete Documentation
Dangerous Goods Declarations (DGD) with missing fields, outdated references, or wrong units can get flagged immediately by carriers. A common error? Forgetting the emergency contact number.
✅ Fix: Always double-check DGDs against a template, and ensure someone trained reviews before submission.
3. Improper Marking & Labelling
Using the wrong hazard label or placing it on the wrong side of the package violates IMDG rules — even if the goods are classified correctly.
✅ Fix: Ensure every handler understands exact marking and labelling rules for each class and sub-class. Don’t assume it’s the packer’s job alone.
4. Expired or Generic Training
Many team members receive outdated or one-size-fits-all training, which doesn’t meet their actual job function. This is especially risky during inspections or audits.
✅ Fix: Provide function-specific IMDG training, and refresh it every two years or after significant code changes.
5. Poor Segregation in Containers or on Deck
Improper stowage or mixing incompatible goods can result in leakage, fire or marine pollution. The IMDG Code is explicit about segregation groups and compatibility.
✅ Fix: Use digital planning tools or checklists to verify cargo layout and container loading sequences.
6. Failing to Maintain Proper Training Records
Even if your team is trained, incomplete or missing training documentation is a major red flag. Inspectors want to see certificates tied to specific roles — and they want to see them fast.
✅ Fix: Store certificates in digital folders by team, with refresher dates clearly tracked. Use our free IMDG Training Tracker →.
7. Neglecting Code Updates (e.g., Amendment 42-24)
Companies often stick to internal SOPs that lag behind current regulations. But with 42-24 introducing new classification rules and recordkeeping requirements, outdated procedures = non-compliance.
✅ Fix: Build a compliance calendar. Review and update SOPs every two years or after each IMDG amendment.
Final Thoughts
Dangerous goods compliance isn’t just about ticking boxes. It’s about building a system that protects people, cargo, and reputation — every shipment, every time.
Avoiding these 7 mistakes doesn’t require perfection. It requires awareness, alignment and training backed by up-to-date tools.
Download: Dangerous Goods Mistakes Checklist
Get a printable checklist to share with your warehouse team, compliance officers or documentation crew.
Top 7 Mistakes to Avoid When Shipping DG by Sea – Checklist PDF
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