UN Certification Markings for Flexible Intermediate Bulk Containers (FIBCs)
The transportation of hazardous goods is subject to strict regulations worldwide to ensure safety and compliance. The United Nations sets these standards through its recommendations, known as the United Nations Recommendations on the Transport of Dangerous Goods, commonly referred to as the ‘Orange Book.’ Flexible Intermediate Bulk Containers (FIBCs) that transport hazardous goods must adhere to these guidelines and receive specific UN certification markings.
In this guide, we will break down the essential aspects of UN certification markings for FIBCs, explain the different types of bulk bags, and help you understand how to ensure your FIBCs are compliant with the highest safety standards.
What Are UN Certification Markings?
UN Certified FIBCs are manufactured and tested in accordance with UN recommendations, ensuring they meet rigorous safety and quality standards. Each certified FIBC is assigned a unique UN Certification Marking number, which provides critical information about the bag’s specifications and packaging requirements. These markings are essential for identifying the FIBC’s capabilities and ensuring it’s suitable for transporting hazardous goods.
Example of UN Certification Markings for FIBCs
The UN Certification Marking consists of a series of numbers and letters that represent important information about the FIBC.
Here’s an example of how these markings appear:

Another example might be:
UN 13H1/Y/03.14/USA/BAG/001
- UN: Indicates that the bag is UN certified.
- 13H1: Classification code for the type of FIBC (explained in detail below).
- Y: Indicates the packing group the FIBC is approved for (Packing Group II or III).
- 03.14: The month and year the FIBC was manufactured.
- USA: The country of approval.
- BAG: The name or identifying mark of the manufacturer.
- 001: The unique test report number assigned to the certified FIBC.
These markings allow quick identification of the bag’s capabilities and compliance status, ensuring the safe handling and transportation of hazardous materials.
The 4 Types of FIBCs Classified by the ‘Orange Book’
The ‘Orange Book’ categorizes FIBCs into four distinct types, each designed to handle different materials and transportation needs:
- 13H1 – PP Woven FIBCs, Without Coating
These bags are constructed from woven polypropylene (PP) material without any coating. They are suitable for applications where a barrier is not needed and can handle non-fine powder materials. - 13H2 – PP Woven FIBCs, Coated
These bags feature a coated layer on the PP woven fabric, offering increased protection against moisture and contamination. Ideal for transporting materials sensitive to moisture or fine powders. - 13H3 – PP Woven FIBCs, With Liner, Without Coating
These FIBCs come with an inner liner but do not have an external coating. The liner provides an additional layer of protection for materials requiring containment but without the added external coating. - 13H4 – PP Woven FIBCs, With Liner and Coating
This type features both an inner liner and an external coating, making it the most protective option. It’s perfect for transporting fine powders or materials that need protection from moisture or contamination.
Knowing which type of FIBC to use for your hazardous goods is crucial for ensuring safe transportation and compliance with UN guidelines.
Packing Group Classifications
The United Nations classifies hazardous materials into three packing groups, each with different degrees of danger:
- Packing Group I (X): High danger
- Packing Group II (Y): Medium danger
- Packing Group III (Z): Low danger
Your FIBC’s certification marking will include a letter (X, Y, or Z) to indicate the appropriate packing group(s) it is approved for. Always ensure you’re using an FIBC suitable for the specific material’s danger level.
Why Are UN Certification Markings Important?
Using UN Certified FIBCs ensures that your bulk bags meet the highest safety standards, protecting both the contents and the individuals handling them. These markings also ensure compliance with international regulations, helping to avoid costly fines or delays in transporting hazardous goods.
FAQs
- How do I know which type of FIBC is best for my needs?
The type of FIBC you need depends on the materials you’re transporting. For example, if you’re dealing with moisture-sensitive or fine powder materials, a coated or lined FIBC (13H2 or 13H4) would be more appropriate. Always consult with an expert to determine the best choice.
- Can I reuse UN Certified FIBCs?
In many cases, UN Certified FIBCs are designed for single use when transporting hazardous materials. However, some bags are made for multiple trips, depending on their certification and condition. Always follow the manufacturer’s guidelines for reuse.
- Where can I find more information on the UN Recommendations?
You can refer to the United Nations Recommendations on the Transport of Dangerous Goods, also known as the ‘Orange Book,’ for detailed guidelines and classifications.
Need Assistance with UN Certification or Safe Handling?
For more information about FIBC certification markings or if you have any questions about transporting hazardous goods, please don’t hesitate to reach out to our FlexSack Experts at sales@flexsack.com or call 205.620.9889. We’re here to help ensure your bulk bag transportation is safe, compliant, and efficient.