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What Are IMO Signs? A Complete Guide to Marine Safety Signage

If you're in the marine, offshore, or shipbuilding industry, you've likely come across IMO signs — but what exactly are they, and why are they important?

In this article, we'll explore everything you need to know about IMO signs, their regulations, materials, and how to choose compliant safety signage for your vessel.

????️ What Are IMO Signs?

IMO (International Maritime Organization) signs are safety and guidance signs used on ships and marine installations. They provide vital information about:

  • Emergency exits
  • Firefighting equipment
  • Muster stations
  • First aid points
  • Life-saving appliances

These signs must remain clearly visible in all conditions — including blackouts — which is why they are typically made from photoluminescent materials.

???? Do IMO Signs Have to Meet a Standard?

Yes — IMO signs must comply with internationally recognised regulations:

  • IMO Resolution A.1116(30) – Defines the layout, design, and usage of shipboard safety signs (adopted in 2020)
  • ISO 24409-2 – Supports harmonised safety symbol design
  • DIN 67510 / ISO 17398 / ISO 16069 – Define the photoluminescent performance requirements

While IMO signs don’t need a CE or ISO mark, the symbols must match A.1116(30) and materials should meet Class C photoluminescent standards or higher for full marine compliance.

???? Why Photoluminescence Matters

Photoluminescent signs glow in the dark after absorbing ambient light, ensuring visibility during power failures.

For marine use, we recommend:

  • Minimum: Class C material
  • UV-stable overlaminate to resist cleaning chemicals and salt spray

View our full range of photoluminescent safety signs

???? Class Comparison Table

We've put together a handy reference comparing photoluminescent material classes:

???? Photoluminescent Class Comparison – Which is Right for Marine Use?

✅ Choosing the Right IMO Signs

When selecting IMO signage, make sure it:

  • Matches A.1116(30) in layout and symbol
  • Uses Class C or higher photoluminescent material
  • Is durable and laminated for marine environments

Explore our range of IMO signs or get in touch if you need custom wording or materials.

✉️ Need Help?

We’ve been manufacturing marine and workplace signage in the UK since 2009. If you're not sure what class or material is right for your application, just contact us.

Stay safe. Stay compliant. Trust SafetySignsAndNotices.co.uk.

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