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Licensed Unlicensed Requires Authentication Published by De Gruyter June 29, 2019

Treatment of European beech with a new wood fire retardant agent based on in situ deposition of calcium oxalate

Tom Franke and Thomas Volkmer EMAIL logo
From the journal Holzforschung

Abstract

European beech (Fagus sylvatica L.) was impregnated in a two-step process with aqueous solutions of potassium oxalate and calcium chloride successively. These compounds are intended to react in situ to the water-insoluble salt calcium oxalate and the reaction by-product potassium chloride. In order to assess the treatability, the solid uptake after the first impregnation and after the treatment was examined. The fixation of the precipitated salts was measured in leaching tests according to the European standard EN 84. The reaction to fire of mineralized beech was tested following the standard ISO 11925-2. A weight percentage gain of appr. 35% indicates a sucessful treatment of the beech with the mineralization agents. The weight percentage gain after leaching indicates a sufficient fixation of calcium oxalate in the wood. Furthermore, results from flammability tests indicate improved fire resistance due to the mineralization.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The authors gratefully acknowledge the Swiss Innovation Agency (Innosuisse) for the financial support.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

References

Browne, F.L. (1958) Theories of the combustion of wood and its control. Forest Products Laboratory Report 2136.Search in Google Scholar

Buurman, P. (1972) Mineralization of fossil wood. Scr. Geol. 12:1–43.Search in Google Scholar

EN 84 (1997) Wood preservatives – accelerated ageing of treated wood prior to biological testing – Leaching procedure.Search in Google Scholar

Fengel, D. (1991) Aging and fossilization of wood and its components. Wood Sci. Technol. 25:153–177.10.1007/BF00223468Search in Google Scholar

Fritz-Popovski, G., Van Opdenbosch, D., Zollfrank, C., Aichmayer, B., Paris, O. (2013) Development of the fibrillar and microfibrillar structure during biomimetic mineralization of wood. Adv. Funct. Mater. 23:1265–1272.10.1002/adfm.201201675Search in Google Scholar

Furuno, T., Shimada, K., Uehara, T., Jodai, S. (1992) Combination of wood and silicate, 2: wood-mineral composites using water glass and reactants of barium chloride, boric acid, and borax, and their properties. Mokuzai Gakkaishi 38:448–457.Search in Google Scholar

ISO 11925-2 (2010) Reaction to fire tests – Ignitability of products subjected to direct impingement of flame – part 2: single-flame source test. International Organization for Standardization, Switzerland.Search in Google Scholar

Khelfa, A., Bensakhria, A., Weber, J.V. (2013) Investigations into the pyrolytic behaviour of birch wood and its main components: primary degradation mechanisms, additivity and metallic salt effects. J. Anal. Appl. Pyrol. 101:111–121.10.1016/j.jaap.2013.02.004Search in Google Scholar

Mai, C., Militz, H. (2004a) Modification of wood with silicon compounds. Inorganic silicon compounds and sol-gel systems. A review. Wood Sci. Technol. 37:339–348.10.1007/s00226-003-0205-5Search in Google Scholar

Mai, C., Militz, H. (2004b) Modification of wood with silicon compounds. Treatment systems based on organic silicon compounds – a review. Wood Sci. Technol. 37:453–461.10.1007/s00226-004-0225-9Search in Google Scholar

Merk, V. Mineralization of Wood Cell Walls for Improved Properties. Dissertation ETH Zürich, Zürich, Switzerland, 2016.Search in Google Scholar

Stephan, I., Leithoff, H., Peek, R.D. (1996) Microbial conversion of wood treated with salt preservatives. Mater. Organismen 30:179–200.Search in Google Scholar

Received: 2019-02-18
Accepted: 2019-05-28
Published Online: 2019-06-29
Published in Print: 2019-10-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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