If you to want ensure that your product is hermetically sealed which ensures it doesn’t leak and is safe from tampering you need induction heat sealing.
Induction heat sealing achieves an air-tight seal when a capped container that has a foil inside the lid passes through an induction field. The foil instantaneously heats up melting a sealing layer and the container is sealed. Induction cap sealing is suitable for both low volume production using a hand-held unit and can run on the fastest production lines at up to 100 metres per minute.
Many industries rely on induction cap sealing as is has many benefits, is simple to use and gives repeatable, reliable seals.