They are used to :
- ensure a perfect sealing of containers (paper or plastic bags, BigBags, ...) after sampling, even if powder has been spilled on the surface;
- avoid product spillage after the sampling and the risk of environmental contamination;
- provide the inviolability of the packaging and avoid the risk of crossed contamination;
- identify that sampling has been done: customized printed seal with specific text or colour marking.
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The 
