The moisture content of freshly –felled: Scots pine sawdust was 60% Norway spruce sawdust was 63% and downy birch sawdust was 45%. The moisture content after compression drying was calculated based on the fresh wood’s weight loss which was obtained by weighing the samples before and after compression . The sawdust particle size distribution varied from 0.5 mm to 4.0 mm for all 3 tree species.