UNEDGED BIRCH

Thickness : 32 mm (cutting size 35 mm )
Width : min 100 mm without bark
Length : 3000 … 3300 mm ( 90% of loading ) , 2100 … 2900 mm ( 10 % of loading )
Moisture : fresh
One truck load : appox. 23m3

Quality E/E+E/A 

One side without knots (E)
Other side without knots (E) or max. 1 knot  / per 1000 mm (A1).
This quality include  10 – 20 % both sides without knots planks

Quality A/B 

One side without knots ( E) or one knot /per 3000 mm (A2).
Other side  knots are allowed (B)

Quality  A/C

One side without knots (E) or one knot  / per 3000 mm (A2).
Other side knots and discolouration are allowed (C)

SQUARE – EDGED BIRCH

Thickness : 25 , 32 ,38 mm
Width : 75 / 100 / 125 / 150 mm
Length : 1000… 3300 mm

Quality I

3 sides without knots.
In one side knots are allowed .

Quality  II  

knots are allowed;
discolouration and heart strip are not allowed.(only max 20 cm in one side)

Quality  III 

knots are allowed;
discolouration are allowed in one side of board