For our Germany, Switzerland & Austria customers please visit https://weinluft.de/
"Because argon is heavier than oxygen, it can act as a protective layer for wine, preventing the very reactive oxygen from interacting with the wine and causing oxidation."
"Through 6,500 years of wine making, keeping opened wine from deteriorating has been a problem. Ironically, the solution was right before us in the form of an inert gas called argon."
SAYV is a canister of pure argon which is an inert gas taken from earth's atmosphere. "Inert" means it will not combine or blend with any other substance. And it contains no oxygen or anything else besides a single argon atom. So, it won't interact with the wine at all. Argon is heavier than air & will sink below the air in a bottle until it lies across the wine. Since there is no oxygen now in contact with the wine, oxidation is prevented.