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CHESTNUT WOOD
CHESTNUT´S TANNINS:
Tannins, also known as tannic acid, are carbohydrates with coloring and antioxidant properties. They are inside wood, and when they are in touch with water they get pigmented.

Chestnut wood shows a high quantity of tannins in its chemical composition. Also with its low permeability, it confers great resistance to putrefaction on the outside and wood-decay on the inside and therefore has a high natural durability.

To avoid tannins appearing on the woods surface and aesthetic deterioration or loss of decorative value of the wood, a product to block the tannins must be applied before finishing the products (lasur, varnish or oil). There are several brands on the market that sell these products and they work perfectly. It´s very important to apply the tannin blocker over all sides of the wood, including head and edges. These products interact chemically with tannins, blocking them "on the spot" in a chemical action that leads to the formation of insoluble compounds of light color that don´t stain the wood or interfere with the decorative value of the wood.

It is also important that the anchorage and fixing of chestnut wood is done with stainless steel A4 screws to prevent corrosion of these and stains on the wood.

The following pictures show a bad application of a tannin blocker or no application at all. It can affect the final result of work. Similarly we see the use of bad/poor quality hardware that can be a negative consequence for the installation.

       

GOOD INSTALLATION WITHOUT TANNINS


       

TANNINS APPEAR DUE TO BAD APPLICATION OF TANNIN BLOCKER OR NO APPLICATION AT ALL

MADERAS SIERO S.A.
T: (+34) 985 741 821 / (+34) 985 741 925
F: (+34) 985 743 407
Los Cuetos s/n, Argüelles
33188 Siero, Asturias (España)
siero@maderassiero.com
 
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The chestnut, the most abundant native tree species in forests Asturias, was once revered in rural areas, being used as raw material for furniture nobles, in traditional construction ...
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The chestnut, the most abundant native tree species in forests Asturias, was once revered in rural areas, being used as raw material for furniture nobles, in traditional construction ...
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MADERAS SIERO S.A.
T: (+34) 985 741 821 | (+34) 985 741 925
Los Cuetos s/n, Argüelles
33188 Siero, Asturias (España)
GPS: 43.384209,-5.726742

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