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Traditional carbonised spruce and fir in comparison

Investigation of traditional charring methods

Comparison of time, temperature and results

For a more precise assessment of the charring process, three sawn spruce and silver fir boards, each 190 × 24 × 4000 mm³, were bound together to form a chimney and charred in a short time (3 – 4 minutes) with an open flame.

The surface temperature of the spruce rose somewhat more slowly than that of the fir, but the shrinkage effect of the wood was more pronounced with spruce. In addition, the pH value of both woods increased significantly, which could indicate a higher resistance to fungi.

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