Class 5 Oxidising Substances and Organic Peroxides Explained | NZ Dangerous Goods Guide

What Are Class 5 Dangerous Goods? 

Class 5 dangerous goods include substances that may not burn themselves but can greatly intensify a fire, as well as substances that may decompose violently, react dangerously, or ignite due to heat or contamination.

These materials present serious fire and reaction risks during handling, storage and transport and are regulated under dangerous goods transport rules in New Zealand and internationally. Class 5 is divided into two divisions based on how the hazard occurs.

Class 5 Divisions 

Class 5.1: Oxidizing Substances

  • Release oxygen or another oxidizing substance
  • Can intensify or accelerate combustion
  • May cause other materials to ignite more easily


These substances do not always burn themselves but can make fires burn faster and hotter.

Common examples: 

  • Ammonium nitrate
  • Calcium hypochlorite (pool chlorine)
  • Hydrogen peroxide (high strength)
  • Sodium nitrate


Class 5.2 Organic Peroxides

  • Are thermally unstable and may decompose rapidly Can burn, explode, or react violently
  • May ignite due to heat, shock, or contamination Often require temperature control during transport


Common examples:

  • Benzoyl peroxide MEKP (Methyl Ethyl Ketone Peroxide)
  • Certain hardeners and curing agents

Dangerous Goods Training (NZ)

If you ship oxidizing substances, organic peroxides, or other dangerous goods by road, proper training is required under NZS 5433 and the Land Transport Rule: Dangerous Goods 2005.

Enrol in our online training:

Shippers of Dangerous Goods by Road (NZ)