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This grade includes planks with different color schemes and grains. Healthy and unhealthy branches up to 40 mm are also permissible, cracks like sapwood.
This grade includes only planks with a similar color scheme. Different grains, healthy branches up to 8 mm and unhealthy up to 3 mm are permitted. Splint is excluded in this sorting.
This grade includes all structures, discolorations as well as cracks that occur naturally. Healthy branches up to 25 mm are admitted in this class.
This grade contains pieces with different color schemes and grains. In addition, knots up to 8 mm and sapwood are permitted up to 50% of the total surface.
This grade contains pieces with different color schemes and grains. Healthy knots up to 8 mm as well as unhealthy ones up to 2 mm are also permissible. Sapwood is excluded in this class.
This grade covers all acceptable characteristics without size or quantity limitations as long as they do not reduce the strength or wear resistance of the wooden floor.
This grade contains only pieces with a similar color scheme. Grains and knots up to 3 mm are allowed. This grade excludes cracks, discoloration and sapwood.