Elite	A	B	C
Sound, intergrown and partially intergrown knots	allowed with the size up to 10 mm. no more than 2 pc. per r.m.	allowed with no limitations	allowed with no limitations	allowed with no limitations
Sound black knots	allowed with the size up to 10 mm. no more than 2 pc. per r.m.	allowed with the size up to 20 mm. no more than 2 pc. per r.m.	allowed with no limitations	allowed with no limitations
Sound knots with shakes	allowed with the size up to 10 mm. no more than 2 pc. per r.m.	allowed with the size up to 20 mm. no more than 2 pc. per r.m.	allowed with the size up to 40 mm. with no limits	allowed with no limitations
Loose knots	allowed with the size up to 10 mm. no more than 1 pc. per article length	allowed with the size up to 10 mm. no more than 1 pc. per article length	allowed up to 10 mm	allowed up to 40 mm
Unsound, tobacco knots	not allowed	not allowed	нnot allowed	allowed up to 40 mm
Shakes	non-through close shakes are allowed up to 25 % of the article length	non-through close shakes are allowed up to 25 % of the article length	non-through close shakes are allowed up to 50 % of the article length	through shakes are allowed that do not impair the article integrity
Gum pockets	allowed if the area is up to 2,5 cm2 – 2pc. per r.m.	allowed if the area is up to 2,5 cm2 – 2pc. per r.m.	allowed with no limitations	allowed with no limitations
Core	allowed up to 1/3 of the article length if not on the face surface	allowed up to 1/3 of the article length if not on the face surface	allowed with no limitations	allowed with no limitations
Resin streaks	resin-soaked spots are allowed up to 10 % of the article area	resin-soaked spots are allowed up to 10 % of the article area	allowed with no limitations	allowed with no limitations
Sapwood	allowed up to 20 % with no contrast	allowed up to 20 % with no contrast	allowed up to 30 % with no contrast	allowed with no limitations
Half-width wane	allowed on the article’s invisible side up to 20% of the article length if a support surface is available	allowed on the article’s invisible side up to 30% of the article length if a support surface is available	allowed on the article’s invisible side up to 30% of the article length if a support surface is available	allowed on the article’s invisible side if a support surface is available
Full-width wane	not allowed	not allowed	not allowed	not allowed
Doze	not allowed	not allowed	not allowed	not allowed
Blueness, green and yellow stains	not allowed	not allowed	not allowed	allowed up to 35 % of the article length
Worm-hole	not allowed	not allowed	not allowed	allowed
Scores	not allowed	not allowed	not allowed	not allowed
Torn grain, hollows, raised grain	allowed up to 0,5 mm deep	allowed up to 0,5 mm deep	allowed up to 1 mm deep	allowed
Under-milling	allowed on the invisible side of the article if a support surface is available	allowed on the invisible side of the article if a support surface is available	allowed on the invisible side of the article if a support surface is available	allowed on the invisible side of the article if a support surface is available. Under-milling of the article’s side planes is allowed max. up to 2 mm deep
Ridge	not allowed	not allowed	not allowed	not allowed
Scorching of wood	not allowed	not allowed	allowed	allowed

PRODUCE QUALITY CRITERIA:

1. Limit dimension deviations:
width: +1mm/-1mm;
thickness: +0.5 mm /- 0.3 mm.
2. The face surface is the one visible during operation.
3. The grading requirements apply to all kinds of shaped articles produced. These requirements are valid for 95% products in the batch supplied for a specific grade (the presence of 5% other grade is allowable). Grade AB is obtained by a natural mixing during the manufacturing process.
4. Flaws in the wood and processing defects are according to GOST2140.
5. Wood moisture content 16±3%.
6. Articles shall be protected against atmospheric precipitation during handling and transportation.
7. Articles shall be stored in dry ventilated warehouses (facilities), stacked in packages or staples. It is allowed to store in open warehouses if packages (staples) are protected with water-tight paper or film. Storage conditions shall be identical along the entire article length. It is not allowed to store articles in residential heated premises.