Costas N. Passialis, Elias V. Voulgaridis
Water Repellent Efficiency of Organic Solvent Extractives from Aleppo Pine Leaves and Bark Applied to Wood
Summary
Natural wax-like materials were extracted from leaves and bark of Aleppo pine (Pinus halepensis Mill.)
by using toluene as organic solvent. Experimental water repellent formulations (WRFs) were prepared
using 10% gum rosin as the resin constituent and 0%, 1% and 2% paraffin wax, pine needle/bark
extracts or mixtures of paraffin wax and needle/bark extracts in proportion 1 : 1 as hydrophobic
substance. All experimental WRFs applied to small, cross-sectional wood specimens of Scots pine
(Pinus sylvestris L.) and beech (Fagus sylvatica L.). Wood specimens were impregnated by a simple
immersion technique and the water repellent effectiveness (WRE) was assessed by using tangential
swelling data. Toluene soluble extracts from needles and bark applied to wood provided hydrophobic
properties to pine and beech wood specimens but to a lesser degree when compared to paraffin wax.
Bark extracts appeared to be stronger hydrophobic materials than needle extracts. Both needle and bark
extracts can be successful substitutes for paraffin wax in WRFs up to 50 %. The degree of protection
provided by WRFs and the differences between treatments were smaller in pine heartwood and beech
sapwood than in pine sapwood.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 53, 03/1999
Pages: 151 - 155
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