Updated: 11-06-25
If you’re already using FIBCs (Flexible Intermediate Bulk Containers) to move or store hazardous materials, you’re probably using UN bulk bags. If not, this guide will help you figure out if they’re right for your needs
UN bulk bags are made to safely hold and transport dangerous materials. To make sure they’re used correctly, the United Nations has set rules for how these bags should be labeled and identified.
UN bags are easy to recognize because they have strict labeling rules. These labels tell you what kind of hazardous material is inside. This is important for safety—everyone handling the bag needs to know what’s in it.
There are 8 different classes of hazardous labels on UN bulk bags:
1. Class 4.1: Flammable solids, (can catch fire easily)
2.Class 4.2: Materials that can catch fire on their
3. Class 4.3: Materials that release flammable gas when wet
4. Class 5.1: Substances that oxidize (can cause or speed up fires)
5. Class 5.2: Organic peroxides (can be explosive or catch fire)
Each UN bag has a label with a lot of important info. This helps track where the bag came from, what it’s made of, and how it should be used.
Here’s what you’ll find on a typical label:
A= The UN packaging symbol
B= A code showing the bag’s design type
C= A letter showing the performance level it passed
D= The month and year it was made
E= The country that approved the bag
F= The name or symbol of the manufacturer
G=How much weight it can safely hold when stacked
H= The maximum total weight the bag can carry
Download our Buyer's Guide to UN Bulk Bags and learn all you need to know about purchasing UN Certified Bulk Bags. By downloading, you'll get access to:
Be sure to read this guide before purchasing UN bulk bags!