Product: Chestnut-extract Botanical name: Castanea sativa
Origin
Middle- and South Europe
Tanning classification
Hydrolysable (acidic former) tanning materials
Specification (all values according to the filter method)
| | Standard | 'sweetened' |
| Tannin content % | 76 +/- 1.0 | 72.0 +/- 0.2 |
| insolubles % | <1.0 | <1.0 |
| humidity % | 8.0 max. | 8.0 max. |
| sugar % | 3.0-4.0 | 3.0-4.0 |
| non-tanning % | < 22.0 | < 22.0 |
| pH (6.9° Bé) | 3.5 +/- 0.3 | 4.5 +/- 0.2 |
| ash % | 5.0 | 5.0 |
Description
Chestnut extract belongs to a group of neutralized sulphite pyrogallol tannins. Chemically it is an ester of phenol carbonic acids and higher alcohol. It is a type of chestnut extract with a reduced astringency and a modified salt/acid ratio. Chestnut extract is used in the re-tanning of leather, tanned with vegetable tanning agents and of chrome leather. The addition amounts up to 30% by weight in all vegetable tanning. For special effects it can be mixed with other agents used in re-tanning. It improves hydrophobic properties of leather, distribution and binding of colour pigments and fats, as well as weight yield.
Application
Use of chestnut extract results in: gross weight yield, excellent physical and chemical properties, even re-tanning and attractive and stable colour. In re-tanning of chrome leather, up to 30% of chestnut extract can be added to obtain smooth, compact and full leather with a good light fastness.
Packing
25 kg paper sacks on pallets of 1000 kg. Package size on request.
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