What HAZCHEM Codes Mean – New Zealand Guide

Whenever you see a code like 3YE, 2WE, or 4X on a fuel trailer or storage tank, you’re looking at a HAZCHEM code — the shorthand emergency language used across New Zealand and Australia to tell responders how to act in an emergency.

These codes indicate fire-fighting methods, PPE requirements, spill behaviour, and whether evacuation should be considered.

They’re a legal requirement under the Hazardous Substances (Hazard Classification) Notice 2020 and the Land Transport Rule: Dangerous Goods 2005.

This page explains what each code means, how to stay compliant, and which Emmjay signs match each specification.

A typical HAZCHEM code has three parts:

Example: 3Y E

• 3 = Use foam
• Y = Breathing apparatus / contain spill / protect waterways
• E = Evacuation may be required

1. HAZCHEM signage visible on each side and rear of vehicle or storage tank
2. Matches the SDS / UN number of the product
3. Clean, legible, and not faded or damaged
4. Displays emergency phone number and HAZCHEM code
5. Fire-fighting and spill gear match the indicated code
6. Staff trained on meaning and emergency response

1. WorkSafe NZ – Hazardous Substances Signage Guide
2. NZ Transport Agency – Dangerous Goods Rule Index
3. EPA NZ – Hazard Classification System
4. Fire and Emergency NZ – Hazardous Substances Table (PDF)

HAZCHEM codes are life-saving emergency guides, not just labels.
By displaying the correct code, UN number and emergency contact on every diesel or fuel trailer, you’re protecting your team, the public, and the environment – and meeting NZ regulatory requirements.

For NZ-compliant, durable and UV-rated signs, visit the
👉 Emmjay HAZCHEM Signs Shop

This information is provided as a general guide only and does not replace the Land Transport Rule (Dangerous Goods 2005), NZS 5433, or any other statutory document.

Always verify the correct HAZCHEM code via your product’s SDS and official standards before transport or display.