Tannin-boron wood preservatives
Tannin-boron wood preservatives are alternative products to replace water-borne formulations based on copper. Interesting results in protection against fungus (pycnoporus sanguineus) were achieved with formulations based of 20% tannin solutions containing boric acid (Thevenon et al. 2009). In this paper two upgrades are introduced: extension of preservation properties to softwood species (scots pine) and analysis of the side-properties achieved after treatment. A detailed study on tannin penetration in beech and scots pine is presented. Microscope analysis demonstrates that impregnation in scots pine have two preferential directions: Longitudinal through tracheids and radial through parenchyma rays, while in beech the liquid penetrates the wood cell mainly longitudinally through large and easy accessible vessels. Commercialization of exterior-door wood preservative will be also dependent on the side-properties derived from the treatment. For this reason, properties such as mechanical resistance and behavior against fire have been investigated. The mechanical tests have shown a strong increasing of compression resistance and surface hardness for beech and scots pine samples. The tests against fire have been monitored considering ignition, flame and ember time. A broad positive effect on fire-repellence is shown when wood is treated with tannin-boron formulations.
| Main Authors: | , , , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
s.n.
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| Subjects: | J12 - Manutention, transport, stockage et conservation des produits forestiers, K50 - Technologie des produits forestiers, acide borique, tannin, produit de préservation du bois, Fagus sylvatica, Pinus sylvestris, lutte anti-incendie, Pycnoporus, http://aims.fao.org/aos/agrovoc/c_1016, http://aims.fao.org/aos/agrovoc/c_7606, http://aims.fao.org/aos/agrovoc/c_8429, http://aims.fao.org/aos/agrovoc/c_24637, http://aims.fao.org/aos/agrovoc/c_5912, http://aims.fao.org/aos/agrovoc/c_2908, http://aims.fao.org/aos/agrovoc/c_31731, |
| Online Access: | http://agritrop.cirad.fr/561719/ http://agritrop.cirad.fr/561719/1/document_561719.pdf |
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