Abbreviation (oxygen transfer rate) for the amount of oxygen that passes through the closure into the filled wine bottle. As a rule, the quantity is relatively low for conventional screw caps and relatively high for corks (natural corks) with a factor of three to four. An oxygen supply in such small quantities is known as nano-oxygenation. See also micro-oxygenation, bottle ageing and oxygen management.
![]()
For me, Lexicon from wein.plus is the most comprehensive and best source of information about wine currently available.
Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)