Grades of our productions

Quality	Grades
	0 (Extra)	A	B	C	D
Examples
1. Healthy knots accrete (light and dark)	Are not supposed	Are supposed in diameter till 1/4 width of a product	Are supposed	Are supposed	Are supposed
1.2. Knots partially accrete and not the accrete	Are not supposed	Are supposed in diameter to 10 mm	Are supposed in diameter to 35 mm	Are supposed	Are supposed
1.3. Healthy knots with cracks	Are not supposed	Are supposed with a crack no more than 2 mm	Are supposed	Are supposed	Are supposed
1.4. Apertures from the dropped out knots	Are not supposed	Are not supposed	Are not supposed	Are supposed in diameter 20мм no more 1st. in compare on 1 m	Are supposed
2. Core	Are not supposed	Are not supposed	It is supposed by places in length no more 200мм on 1p/m	Are supposed	Are supposed
3. Pitch pockets	Are not supposed	Are supposed by the area to 0,5 sq. sm (approximately 25mm*2mm or 5mm*1mm)	Are supposed by the area to 5 sq. sm (approximately 12,5sm*4mm or 25sm*2mm)	Are supposed	Are supposed
4. Cracks	Are not supposed	Microcracks are supposed	Than 1 mm are supposed in the width no more. And length no more than 100 mm.	Are supposed	Are supposed
5. Bark germination	Are not supposed	Are not supposed	It is supposed in the width to 20mm and long to 100mm in quantity 1st. on an item	Are supposed, if durability isn't broken	Are supposed
6. Defects of manufacture: Incomplete processing (on face)	Are not supposed	Are not supposed	Are not supposed	Are supposed by square no more than 5 % of a surface	Are supposed by square no more than 10 % of a surface
6.2. Incomplete processing at an end face	Are supposed blocked incomplete processing	Are supposed blocked incomplete processing	Are supposed blocked incomplete processing	Are supposed	Are supposed
8. Colouring changes: chemical colourings, mushroom defeats, a sapwood in a larch	Are not supposed on face sheet	Are not supposed on face sheet	Are not supposed on face sheet	Are supposed stains of a red mould, посинения, a sapwood by a total area no more than 1/6 squares of a product (no more than 10 % of volume)	Are supposed
9. Curvature: Longitudinal on an edge	Are not supposed	Are not supposed	Are supposed with an arrow of a deflection to 8mm on length of a product	Are supposed with an arrow of a deflection to 8mm on length of a product	Are supposed with an arrow of a deflection to 15mm on length of a product
10. Geometry infringement	Are not supposed	Are not supposed	Are supposed with a deviation from planeness: wall cladding-5mm, the flooring - 2mm.	Are supposed with a deviation from planeness: wall cladding-5mm, the flooring - 2mm.	Are supposed with a deviation from planeness: wall cladding-5mm, the flooring - 2mm.

 

The note: in each grade it is supposed impurity to 5 % of adjacent grades; admissions on length +/-5mm., on width +/-1 mm., on a thickness +/-0,5 mm.; criteria of quality are defined on face sheet.