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What is a UN Number
Author: Ivy Tse
Published:
Updated:

What Is a UN Number?

In international shipping and logistics, a UN number is a four-digit identifier for hazardous materials, ensuring safe transport across borders. This guide covers its definition, uses, and 2025 compliance tips for shippers.

A UN number identifies dangerous goods precisely in global supply chains.

Assigned

Shippers rely on it for labeling, documentation, and emergency response.

UN numbers originated from post-World War II safety efforts.

The United Nations Committee of Experts on the Transport of Dangerous Goods developed them in the 1950s.

Today, they align with IMDG Code, IATA regulations, and DOT standards.

  • 1956: First UN Recommendations published.
  • 1960s: Adopted by international modal regulations.
  • 2025: Enhanced digital tracking requirements in key markets.

UN numbers get assigned through a rigorous UN process.

Manufacturers submit data to the UN Secretariat for classification.

Approved numbers enter the official list, updated biennially.

  1. Gather substance properties like flammability and toxicity.
  2. Classify per nine hazard classes.
  3. Receive provisional or permanent assignment.

Explore common UN numbers for everyday hazardous shipments.

From batteries to chemicals, these examples highlight practical uses.

UN NumberHazard ClassExample Substance
UN12633Paint
UN27898Batteries, wet, filled with acid
UN18308Sulphuric acid
UN30829Environmentally hazardous substance
UN34809Lithium ion batteries

UN numbers drive safety in dangerous goods transport.

They enable quick identification during incidents, reducing risks.

Regulators mandate them on packages, vehicles, and documents.

  • Prevents mishandling of flammables or toxics.
  • Supports first responders via ERG guides.
  • Ensures insurance coverage validity.
  • Facilitates customs clearance.
  • Boosts supply chain efficiency.

Compare UN numbers to NA, ID, or DOT numbers.

UN numbers are global; North American variants like NA numbers adapt them locally.

ID numbers serve military uses.

  • UN: International standard.
  • NA: US/Canada specific for non-UN substances.
  • DOT: US marking, often matches UN.

Locate the right UN number for your shipment step-by-step.

Use official databases for accuracy.

  1. Check Safety Data Sheet (SDS).
  2. Consult UN Recommendations on Transport of Dangerous Goods.
  3. Search IATA, IMDG, or ADR lists.
  4. Verify with national
  5. Use digital tools for updates.

Navigate 2025 UN number regulations and changes.

No major WCO revisions until 2027, but 2025 brings national digital mandates in EU and Asia.

Cite UNECE updates for lithium batteries (UN3480).

  • EU: Mandatory e-declarations with UN numbers.
  • China: Stricter verification for imports.
  • US: Enhanced PHMSA tracking.

2025 case study: UN numbers in e-commerce fulfillment.

A Hong Kong shipper avoided fines

WCO citations emphasize proactive classification.

FAQ

What does UN stand for in a UN number?

UN stands for United Nations, the body standardizing dangerous goods identifiers.

Is a UN number required for all shipments?

No, only for hazardous materials classified under UN regulations.

How many digits is a UN number?

A UN number consists of exactly four digits.

Where do I find the official UN number list?

Access it via UNECE website or modal regulations like IMDG.

What if my substance lacks a UN number?

Apply for a provisional number through national competent

Do UN numbers change over time?

Yes, updates occur biennially based on new safety data.

Are UN numbers used in air freight?

Yes, IATA DGR mandates them for dangerous goods.

How do UN numbers aid emergency response?

They link to Emergency Response Guides for immediate actions.

What are 2025 updates for UN numbers?

Focus on digital integration and lithium battery specifics.

Conclusion

Mastering UN numbers ensures compliant, safe shipping in 2025.

For expert guidance, Book a Demo with FreightAmigo.

Contact: HKG +852 24671689 / +852 23194879 | CHN +86 4008751689 | USA +1 337 361 2833 | GBR +44 808 189 0136 | AUS +61 180002752 | Email: enquiry@freightamigo.com