Scotch cask terminology explorer

The first time a cask is used to mature Scotch after its previous use or preparation. First-fill casks generally have more extractive potential than the same cask after repeated Scotch fills, but the term alone does not predict flavour intensity.

A cask that has already held Scotch through at least one previous maturation cycle. Refill casks can allow more distillery character to remain visible because wood extraction may be less intense, although individual casks vary.

A cask previously used for bourbon. The term identifies previous use; it does not guarantee a particular level of vanilla, coconut or sweetness in the finished Scotch.

Oak casks prepared with sherry before use for Scotch maturation. Seasoning method, sherry style, oak, cooperage and refill history all affect the result.

A cask format commonly encountered in Scotch maturation. Capacity can vary, especially when casks are rebuilt or re-coopered, so the name should not be treated as one exact universal volume.

A larger cask format often associated with sherry-seasoned oak in Scotch discussions. Actual size and construction can vary.

A cask format strongly associated with ex-bourbon maturation. “Barrel” can describe a physical cask size and should be kept separate from the broader phrase “ex-bourbon cask.”

A smaller cask format. Higher surface-area-to-volume ratio can change extraction rate, but smaller does not automatically mean better or equivalent to longer maturation.

A period in a different cask after the main maturation period. Finishing can add or reshape flavour without meaning that the entire maturation occurred in that cask type.

Oak deliberately seasoned with another liquid before Scotch maturation. The phrase needs context: what liquid, how long, what oak and whether the cask is first fill or refill.

New oak that has not previously matured another alcoholic drink. It can contribute strong wood influence, but intensity depends on oak, toast/char, cask size, maturation time and spirit.

A used cask that has been treated to expose or reactivate wood surfaces. The treatment can change extraction without making the cask equivalent to virgin oak.