Skip to Content

Explosive Precursors

The European Union regulation on the marketing and control of precursors came into effect in Northern Ireland on 2 September 2014.

Substances that are to be controlled fall into the three tiers below:

Tier 1

Tier 2

Tier 3

Ammonium Nitrate

Hydrogen Peroxide


Calcium Ammonium Nitrate


Sulphuric Acid

Potassium Nitrate

Nitric Acid


Sodium Nitrate

Potassium Chloride

Calcium Nitrate

Sodium Chlorate

Sodium Perchlorate



Potassium Perchlorate



Tier 1 chemicals are those which fall under the current Northern Ireland controlled substances licensing regime.

Previous Page
A-Z Guidance