Foil seals on bottles question

[caveman]

Trivial question:

Does anyone know what the "foil" seal around the top of bottles of Single Malt is made of (the bit that you tear off to reveal the cork)?

It would settle a debate we had whilst drinking our last bottle - i thought Aluminium alloy, my friend thought lead...

Many thanks (hope this isn't the wrong thing to post here)

[Archer]

I cant say i have ever thought about it but i would assume it is some sort of aluminum foil although some bottles have a plastic seal. It certainly wont be lead.

[Bookie]

Hi caveman and welcome to the SMW forum

Most seals on whisky bottles are aluminium foil. Bottles are sealed using a method called induction sealing which is a simple and reliable method of bottle sealing. It welds an aluminium foil seal across the bottle neck.

Bottles are filled then they are capped either with a screw cap but more usually a cork in the case of single malt whiskies, the cap/cork is then fitted with an auluminium foil seal and then passed under an induction sealer. This transmits an electromagnetic field, somewhat similar to a microwave oven, that heats the aluminiium seal and bonds it to the bottle neck.

Anyway i hope you enjoyed your last bottle of single malt.

[caveman]

many thanks for the help