Clayver is made of stoneware. This kind of ceramic is chemically more inert and
considerably harder than clayware. The most common contaminants coming from clayware
vessels are Iron and aluminium. The chemical composition of Clayver combined with the
considerably high firing temperature ensure a negligible migration to wine of any metal ion.
Clayver is porous. The little porosity is tuned to let a controlled amount of oxygen dissolve
into the wine, accompanying wine ageing. This must be considered especially when the vat
is cleaned and stored empty.
Clayver vats are resistant, but some precautions must be taken to avoid ruptures, chippings
and other damagements. Generally any direct contact (especially hits, strokes etc) with
metals (namely iron and steel) must be avoided. If it is necessary to lay on their side the
containers, make sure to place a soft interface (paperboard, wood etc) between Clayver and
A particular attention must be paid to the top edges of the clayver. Sharp edges are delicate
and the top flattened surface must not be scratched to maintain a good sealing.
If a racking pipe is used, make sure that the steel pipe is protected from the direct contact to
the edges of the container by means of a silicon socket. The same is true for any kind of
stock or steel tool put inside the clayver for example to move up lees