Quality grades

Quality grades in plywood

Depending on surface quality – hardwood

Allowable defects*
Value	Description
Pin knots	allowable diameter of up to 3 mm; up to 3 pcs/m2
Sound intergrown knots	allowable diameter of up to 15 mm (cumulative diameter shall not exceed 30 mm/m2), small cracks allowable
Filled unsound knots and knot holes	with diameter of up to 6 mm, up to 2 pcs/m2
Open splits	less than 1/10 of a length of a sheet, width up to 3 mm, 3 pcs per sheet width
Closed splits	allowable
Wood structure defects	minor ones allowable
Sound color changes	minor decoloration allowable
Repairs (patches, plugs)	3 pcs/m2 fully filled
Edges defects	allowable up to 2 mm

* Catalogue of most common defects, for other defects please refer to EN 635 -1-2-3 standards.

Depending on surface quality – hardwood

Allowable defects*
Value	Description
Pin knots	allowable
Sound intergrown knots	allowable diameter of up to 35 mm, small cracks
Filled unsound knots and knot holes	if not fixed allowable diameter of 5 mm, if fixed – up to 10 mm, 3 pcs/m2
Open splits	if properly filled, allowable shorter than 1/5 length of a sheet, width up to 5 mm, 3 pcs/m of a sheet width
Closed splits	allowable
Wood structure defects	minor allowable
Sound color changes	minor decoloration allowable
Repairs (patches, plugs)	6 pcs/m2
Edges defects	allowable up to 5 mm
Bark pokets	up to width of 5 mm, if correctly filled
Open shakes	up to width of 3 mm, 1 pcs/m of sheet width, with splits infilled if their width exceeds 1 mm
Glue seepage	small and seldom
Hollows, traces, ridges	minor ones allowable
Overlaping	up to 1 pcs/m2 and with length up to 100 mm
Surface roughness	minor roughness allowable

* Catalogue of most common defects, for other defects please refer to EN 635 -1-2-3 standards.

Depending on surface quality – hardwood

Allowable defects*
Value	Description
Pin knots	allowable
Sound intergrown knots	up to diameter of 50 mm
Filled unsound knots and knot holes	up to diameter of 40 mm
Open splits	If not filled allowable: smaller than 1/3 sheet length and with width up 20 mm, 3 pcs/m of sheet length, if filled – no restrictions
Closed splits	allowable
Wood structure defects	allowable
Sound color changes	allowable
Repairs (patches, plugs)	no limitations
Edges defects	allowable up to 5 mm
Bark pokets	up to width of 25 mm
Open shakes	up to width of 5 mm, 2 pcs/m of sheet width with splits infilled allowable
Glue seepage	allowable up to 5 % of the sheet surface
Oversanding	allowable up to1 % of the sheet surface
Hollows, traces, ridges	allowable
Overlaping	up to 2 pcs/m2
Surface roughness	allowable

* Catalogue of most common defects, for other defects please refer to EN 635 -1-2-3 standards.

Depending on surface quality – hardwood

Allowable defects*
Value	Description
Pin knots	allowable
Sound intergrown knots	allowable
Filled unsound knots and knot holes	allowable
Open splits	allowable
Closed splits	allowable
Wood structure defects	allowable
Sound color changes	allowable
Repairs (patches, plugs)	no litmiations
Edges defects	allowable
Bark pokets	allowable
Open shakes	allowable
Glue seepage	allowable
Oversanding	allowable
Hollows, traces, ridges	allowable
Overlaping	allowable
Surface roughness	allowable

* Catalogue of most common defects, for other defects please refer to EN 635 -1-2-3 standards.

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