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What is UN3373 external or tertiary packing?

What is UN3373 external or tertiary packing?

May 15, 2023

Badu(Xiamen) Technology Co., Ltd develops, manufactures and distributes a full line of solutions for the transport of biological substances of Category A (UN 2814 - UN 2900) and B (UN 3373), at room temperature, chilled or frozen.

The UN3373 specimen transport bag is a specific external or tertiary packing that is used for the safe transportation of biological substances, including clinical specimens, diagnostic samples, and other potentially infectious materials. These bags are designed to meet the requirements outlined by the United Nations (UN) for the transportation of biological substances, hence the code "UN3373."

When transporting UN3373 specimen transport bags, it is necessary to adhere to specific guidelines for packaging at different levels:

  1. Primary packaging: This refers to the individual leak-proof specimen containers (e.g., tubes or vials) that hold the biological samples. These containers must meet the required standards for leak-proof and airtight sealing.

  2. Secondary packaging: The UN3373 specimen transport bag itself serves as the secondary packaging. It is the bag specifically designed to enclose and contain the primary containers, providing an additional layer of protection. The bag should be leak-proof and resistant to damage during transportation.

  3. Tertiary packaging: The tertiary packaging is the outer packaging that surrounds the UN3373 specimen transport bags. It is an extra layer of protection and containment to safeguard the specimens and ensure compliance with the transportation regulations. Tertiary packaging is usually required when shipping packages containing UN3373-specimen transport bags in bulk or for long-distance transportation.

The requirements for UN3373 tertiary packaging may vary depending on the specific regulations of the country or region. However, common considerations for tertiary packaging include:

  • Sturdy construction: The tertiary packaging should be sturdy enough to protect the UN3373-specimen transport bags from external impact or damage during transit.

  • Cushioning material: The use of appropriate cushioning materials, such as bubble wrap or foam, can provide additional protection against shocks and vibrations.

  • Sealing: The tertiary packaging should be secured with appropriate sealing methods, such as tapes or adhesive closures, to prevent accidental openings or spillage.

  • Clear labeling: The packaging should be clearly labeled with the appropriate UN3373 hazard symbol, indicating the presence of biological substances. Information about the shipper, receiver, and any necessary handling instructions should also be clearly displayed.


It is essential to consult and comply with the specific regulations and guidelines provided by the relevant authorities or organizations overseeing the transportation of biological substances, such as the International Air Transport Association (IATA) or national transport agencies. These regulations ensure the safe handling and transportation of UN3373 specimen transport bags and minimize the risks associated with the transportation of biological materials.

All our packaging complies with the recommendations and regulations in force by the ADR (road), RID (rail), ADN (inland waterways transport) IMGD (transportation by sea), ICAO (International Civil Aviation Organization) and IATA (international air transport).

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