Bentonite

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A clayey rock formed by the weathering of volcanic ash. It was named after the first site where it was found near Fort Benton in the US state of Wyoming. The mineral, also known as alumina, consists of calcium, sodium and aluminium silicates. It has a high adsorption capacity (accumulation of gases or dissolved substances) and a good swelling capacity, which increases its volume.

Use in viticulture

In viticulture, low-swelling calcium bentonites or medium-swelling mixed bentonites (calcium and sodium) are used for various fining and stabilisation techniques such as protein and heat stabilisation. This removes the thermolabile protein. Untreated wines can already form heat turbidity at temperatures of 17 to 20 °C. The treatment can be carried out in the grape must or in the wine.

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Roman Horvath MW
Domäne Wachau (Wachau)

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Use in viticulture

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Use in viticulture

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