Grades of block parquet and massive board
Sorting is based on standard characteristics: knottiness, degree of mottling and type of saw cut (quartersawn cut, mixed cut – tangential and semi-tangential). According to the state standard http://www.snip-info.ru/Gost___862_1-85.htm) massive board is divided into two grades A (the highest quality category) and B (the first quality category).
Block parquet
The company Art Parquet has 5 grades of block parquet: "Radial select", "Radial", "Standard", “Natur" and "Rustic".
"Radial select" |
"Radial" |
"Standard" |
"Natur" |
"Rustic" |
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category А | category А | category А | category А | category B |
quartersawn cut | quartersawn cut | mixed cut | mixed cut | mixed cut |
medullar rays are not acceptable | medullar rays 25% | medullar rays without selection | medullar rays without selection | medullar rays without selection |
texture is even | texture is even (variation is no more than 10%) | texture: natural wood texture | texture: natural wood texture | texture without selection |
colour scale is even | colour variation is no more than 10% | great colour difference is not acceptable | colour difference not caused by flaws of wood | colour without selection |
knots are not acceptable | knots are not acceptable | knots are not acceptable | knots are acceptable, but no more than 2 knots on the plank: | no more than 3 knots on the plank |
sapwood is not acceptable | sapwood is not acceptable | sapwood is not acceptable | sapwood up to 20% of plank’s area | sapwood up to 30% of plank’s area |
Massive board
The company Art Parquet has 4 grades of massive board: "Radial", "Premier", "Natur" and "Rustic".
"Radial" |
"Premier" |
"Natur" |
"Rustic" |
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category А | category А | category А | category B |
quartersawn cut | mixed cut | mixed cut | mixed cut |
medullar rays 25% | medullar rays without selection | medullar rays without selection | medullar rays without selection |
texture is even | texture is even (variation is no more than 10%) | texture: natural wood texture | texture: natural wood texture |
colour scale is even | little colour variation is acceptable | colour without selection | colour without selection |
knots are not acceptable | sound knots up to 5 mm, but no more than 2 knots on a plank | not drop-down knots up to 10 mm, but no more than 2 knots on the plank | not drop-down knots up to 20 mm |
sapwood is not acceptable | sapwood is not acceptable | sapwood is up to 10 mm of the plank’s width, but no more than 1/3 of the plank’s length | sapwood up to 30% of plank’s area |