What HAZCHEM Codes Mean

What HAZCHEM Codes Mean – A Quick Reference Guide for Site Managers

🚛 Why HAZCHEM Codes Matter

HAZCHEM codes are a vital part of site safety communication.
They provide first responders and site managers with instant instructions during a chemical emergency — including firefighting methods, protective gear, and evacuation requirements.

Every HAZCHEM sign supplied by Hazard Signs NZ follows AS/NZS 1319:1994 and aligns with WorkSafe NZ and EPA NZ guidelines.

⚙️ Understanding the Code Format

A HAZCHEM code generally contains:

  • A number → type of extinguishing medium (foam, fog, dry agent)

  • A letter → safety actions and PPE requirements

  • Optional “E” → evacuation may be necessary

Example:

3YE → Use foam, wear breathing apparatus, evacuate area

🧾 HAZCHEM Code Reference Table

Code Meaning (Emergency Action) Typical Substance Example Sign
2WE Use water fog or fine spray. Full protective clothing and breathing apparatus. Evacuation may be needed. Diesel Fuel Diesel HAZCHEM Sign
3YE Use foam. Wear breathing apparatus. Evacuate area if necessary. Aviation Fuel / Jet A-1 HAZCHEM 3YE 1863 Aviation Fuel Sign
2XE Use dry agent. Full PPE with breathing apparatus. Evacuate area. Methyl Bromide Methyl Bromide HAZCHEM Sign
2YE Use water fog or fine spray. Wear full PPE. Evacuate area if required. Ethanol UN 1170 Ethanol HAZCHEM Sign
3Z Use foam. No water jets. Wear breathing apparatus. Petrol UN 1203 Petrol HAZCHEM Sign
3Y Use foam. Breathing apparatus required. Contain spill. Kerosene UN 1223 Kerosene HAZCHEM Sign
4WE Use dry agent or water spray. Evacuate area. Paint Products UN 1263 Paint Products HAZCHEM Sign
3XE Use foam. Evacuation required. Flammable Liquid UN 1993 Flammable Liquid HAZCHEM Sign
2RE Use water fog. Full PPE. Evacuate. Ammonia Solution UN 2672 Ammonia HAZCHEM Sign
3YE Foam or dry agent. Wear full protective gear. Evacuate. LPG UN 1075 LPG HAZCHEM Sign

(These internal links reinforce authority across your DG Class 1–9 range and boost relevance site-wide.)

📐 How These Codes Are Decided

HAZCHEM codes are standardised internationally under the UN Recommendations on the Transport of Dangerous Goods.
In New Zealand, they’re administered under the HSNO Act and managed by the Environmental Protection Authority (EPA).

Your site’s Safety Data Sheets (SDS) specify the exact HAZCHEM code for each substance.
This code must match the signage displayed on storage tanks, transit depots, and vehicles.

🧱 Placement and Material Requirements

For clarity and durability:

  • Use reflective or laminated ACM panels for outdoor mounting.

  • Maintain clear viewing distances (300 × 225 mm → 5 m; 1200 × 800 mm → 30 m).

  • Always display the HAZCHEM panel near entry points or bulk storage areas.

All signs from Hazard Signs NZ are printed on laminated vinyl, available on PVC, Corflute, or ACM, ensuring long-term outdoor compliance.

🚨 Quick Compliance Checklist

✅ HAZCHEM code displayed matches the SDS
✅ Sign meets AS/NZS 1319:1994 sizing and colour rules
✅ Durable and legible from required distance
✅ Positioned where emergency responders can see it immediately

🧩 Related Articles

⚖️ External References

💬 Note

When it comes to hazardous substances, the right sign could save a life.
At Hazard Signs NZ, we manufacture all HAZCHEM panels locally in Invercargill, ensuring accuracy, durability, and compliance for every site in New Zealand and Australia.
Need a specific code or custom size? Contact us today or call +64 3 218 2678 — we’ll make sure your site stays fully compliant.

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