Investigation of the suitability of silver fir (Abies alba Mill.) for thermal modification

IRG/WP 04-40275

C Brischke, A O Rapp

In this study the suitability of silver fir (Abies alba Mill.) was examined for thermal modification. Comparative experimental investigations were performed with silver fir and Norway spruce (Picea abies Karst.) after thermal treatments. Besides properties, which characterize the quality of heat treatments, like dimensional stability and resistance against fungal attack, strength properties of the heat treated material were tested, i.e. bending strength, modulus of elasticity (MOE), impact bending strength and resistance to abrasion. Silver fir was found to be slightly more suitable for thermal modification than spruce, when treated at 180 °C, whereas thermal modification at 220°C showed a comparable suitability for both species. Advantages of silver fir were found for its impact bending strength, durability, and formation of cracks after weathering.

Keywords: Anti-Swelling-Efficiency (ASE), durability, formation of cracks, heat treatment, resistance to abrasion, strength

Conference: 04-06-06/10 Ljubljana, Slovenia

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