How to Seal a UN Product – A Guide from Emballator
Posted 2024-11-26
Ensuring that your hazardous goods are correctly packaged and sealed is crucial for safety during transport. At Emballator, we want to help you understand how to properly seal our UN packaging to meet international safety standards. Here is our step-by-step guide with examples from our own range of metal cans.
General Information about UN Certification
The UN certificate is proof that the entire package meets the requirements for hazardous goods according to UN regulations. It is not enough for individual components such as the can, lid, and other parts to be manufactured according to specific requirements; they must be used together to achieve the intended function and for the UN certificate to be valid. Proper sealing after filling is crucial to ensure the function and safety of the UN packaging.
Cans with Press Lids
UN cans with press lids are available in diameters of ø 99, 105, and 153 mm in our range. These cans have TT lids (Triple Tight) and rings. Glue is applied to the bottom of the ring, which comes into contact with the lid when sealed. The glue, combined with friction, ensures that the lid does not come off when the package is subjected to force, such as in a fall. Therefore, it is important that the lid is pressed against the can with sufficient force so that it comes into contact with the glue inside the ring. The recommended force from the press plate during sealing is at least 2200N for ø 99 and 105, and 3000N for ø 153. After sealing, the lid should be level with the edge of the can. If necessary, a special press plate can be used to press the lid below the edge level.
UN Press Lid with Ring Locks
This packaging consists of a metal can, a UN press lid, and a UN ring lock with a locking pin. The combination ensures that the lid does not come off if the package is subjected to increased internal pressure or external damage, such as in a fall. First, the UN press lid is mounted on the can with a conventional lid press with a plate and an air cylinder. The recommended press force is about 2000 N. After the press lid and can are assembled, the UN ring lock is closed around the lid and the can’s profile. When the ring lock is closed, a proper locking pin must be installed in the handle to prevent the ring lock from opening.
Pails with Nab Locks
UN buckets with nab locks are available in diameters of ø 180 and 285 mm in our range. The lid has so-called nabs that are pressed under the top of the pail, holding the lid in place. A special tool is needed to seal a pail with nab locks. It is important that the nabs are correctly pressed under the top edge of the bucket. A visual inspection or measurement of the edge height after assembly is recommended to ensure proper sealing. If you notice a deterioration in the sealing, it may be due to the nab lock tool being damaged or worn, or the air pressure being insufficient, preventing the nab lock tool from reaching the necessary bottom level.
EasyOpen UN
This packaging consists of a metal bucket and a lid from our EasyOpen range. The lid is equipped with a plastic safety ring that ensures the lid stays in place under internal pressure or external force, such as in a fall. The design allows the lid to be mounted with a conventional lid press with a plate and an air cylinder. Important points to consider when sealing the bucket:
· Place the lid centered on top of the bucket.
· The required force to press down the EasyOpen 180 UN lid is approximately 4000 N.
· For the EasyOpen 285 UN, the required force is approximately 6000 N.
· For easy assembly, the lid must be at least 20°C. If the lids are stored in a cold room, they should be moved to room temperature at least 24 hours before use on the bucket.
By following these guidelines and using our products, you can ensure that your UN packaging is properly sealed and ready to transport hazardous goods safely and efficiently. At Emballator, we strive to offer solutions that meet and exceed current and future safety requirements.
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