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IMPROVEMENTS IN THE BIOLOGICAL DURABILITY OF UK GROWN TIMBERS BY VARIOUS WOOD MODIFICATION TECHNIQUES

By Dennis Jones, Nancy Howard, Garston Watford and Wd Xx Hertfordshire

Abstract

The use of wood modification techniques has gained acceptance as a means of improving some of the properties of European timber species. Among the main improvements are increased dimensional stability and natural durability. Whilst results from various European studies may be inferred to UK grown timbers, there have been very few specific tests carried out to date. The work used the recommended guidelines for Basidiomycetes testing described in CEN TC38/WG23/N34 for assessment of natural durability using Coniophora puteana and Poria placenta on Scots pine and Sitka spruce for the following treatments: − Acetylation − Furfurylation − Heat treatment − Hot oil treatment Results are also compared to EN350-1. Results to date indicate that furfurylation and acetylation are capable of improving the durability classification of UK grown Sitka spruce from Not Durable, Durability Class (DC) 5 for control samples to Very Durable (DC1). More interestingly, lower durability classifications were obtained when using UK grown Scots pine, where the treated samples could be regarded as Moderately Durable (DC3) or Slightly durable (DC4). Normally higher levels of modification would be expected for Scots pine compared to Sitka spruce. This may be due to a more effective envelope treatment with the Sitka spruce samples In addition a brief summary of some other properties tested is given

Topics: wood modification, pine, spruce, durability test Summary
Year: 2004
OAI identifier: oai:CiteSeerX.psu:10.1.1.134.1893
Provided by: CiteSeerX
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