| Defect |
Grade |
| B |
S |
BB |
CP |
C |
| 1. Knots: |
| a) pin knots |
Allowed |
| b) inter-grown, sound lightа and dark knots |
Not taken into consideration in size (mm) |
Sound knots with splits not more than 1,5 mm |
Allowed |
| Light knots up to 10 mm |
Light and dark knots up to 10 mm |
| Light knots up to 25 mm, no more than 8 knotsа per m2 of the sheet |
Light and dark knots up to 25 mm, no more than 3 knots per m2 of theа sheet |
Light and dark knots up to 25 mm, no more than 20 knots per m2 of the sheet; 5 knots of the amount up to 40 mm |
| With radial checks no more than 1.0 mm wide |
| c) partly inter-grown |
Among inter-grown knots up 5 mm , no more than 3 knots per m2 of the sheet |
Allowed among inter-grown knots up 10 mm , no more than 3 knots per m2 of the sheet |
Allowed among inter-grown knots up 15 mm , no more than 10 knots per m2 of the sheet |
Allowed |
Allowed |
| d) black, loose knots and knotholes |
Among inter-grown knots up to 5 mm, no more than 3 knots per m2 of the sheet on condition of putty closing and sanding |
Not allowed |
Not allowed |
Not allowed |
Allowed up to 40 mm, no more than 10 per m2 of the sheet |
| 2. Splits: |
| a) closed splits |
Allowed edge splits |
Allowed |
| up to 100 mm long, no more than 1 split per 1 m of panel width |
up to 200 mm long, no more than 2 splits per 1 m of panel width |
up to 200 mm long, no more than 2 splits per 1 m of panel width |
| b) open splits |
Not allowed |
Allowed edge splits |
| up to 2 mm wide, 200 mm long, no more than 1 split per 1 m of panel width
In case of putty repair |
up to 2 mm wide, 250 mm long, no more than 1 split per 1 m of panel width |
up to 2 mm wide, 600 mm long, no more than 3 splits per 1 m of panel width |
up to 10 mm wide, 600 mm long, no more than 3 split per 1 m of panel width |
| 3. Defects of wood structure: |
| a) cross grain, wavy fiber, curlyа grain |
Allowed |
| b) inter-grown bark pocket (light) |
Not allowed |
Allowed |
| c) inter-grown inbark (dark) |
Not allowed |
Allowed |
| d) false heartwood |
Not allowed |
Allowed no more than 25% of the sheet surface |
Allowed no more than 75% of the sheet surface |
Allowed |
| e) flecks |
| -fiber veins and their traces |
Not allowed |
Allowed up to 175 mm long, 4 mm wide |
Allowed up to 250 mm long, 10 mm wide, no limits in number |
Allowed |
| -veins grouping |
Not allowed |
Allowed not more than 60x40 |
Allowed |
| 4. Chemical coloring |
Not allowed |
Allowed |
| 5. Fungal affection |
| a) fungous stain (blue stain fungi, colored spots) |
Allowed insignificantly contrasted to the color, up to 15% of the sheet surface |
Allowed |
Allowed up to 50 % of the sheet surface |
Allowed |
| b) brown streak |
Not allowed |
Allowed |
Allowed up to 50 % of the sheet surface, general area of redtop together with false heart shouldn`t be more than 50 % of the sheet surface |
Allowed |
| 6. Knots and holes repair |
Allowed as per item 1 d) of present table |
Veneer patching with selection of color and direction of wood grain up to 1 peace per m2 of the sheet |
Knots and knotholes of sizes more than indicated inа items 1b) and 1c)а should be repaid by veneer patches |
Allowed |
| Veneer patching with selection of color andа direction of wood grain. Total number of patches with allowed sound inter-grown knots shouldn`t be more as per item 1 b). One double patching is allowed on the sheet |
Allowed double patches. Allowed repair of holes from fallen patches with putty and following sanding |
| 7. Splits repair |
Not allowed |
Allowed as per item 2b) of present table |
Allowed putty repair and sanding of splits with width up to 10 mm and length up to 250 mm |
Allowed putty repair and sanding of splits with width up to 10 mm and length up to 600 mm |
Allowed putty repair and sanding of splits with width up to 25 mm and length up to 1000 mm |
| 8. Glue penetration |
Allowed 1 per m2,а in shape of streak with length up to 175 mm and width up to 1 mm |
Allowed in shape of spot no more than 15x15 mm, up to 3 spotsа on the sheet |
Allowed 1 per m2,а in shape of streak with length up to 250 mm and width up to 1 mm or in shape of spot no more than 75x75 mm |
Allowed |
| 9. Imprints and hollows |
Not allowed |
Allowed 1 spot on the sheet up to 5 mm in size in case of putty repair and sanding. |
Allowed 1 per m2, up to 6 mm in size on condition of putty repair and sanding. |
Allowed on condition of putty repair and sanding. |
Allowed |
| 10. Mechanical defects:
-scratches |
Not allowed |
Allowed |
| 11. Sanding through |
Not allowed |
Allowed no more than 5 % of panel surface |
Allowed no more than 10 % of panel surface |
| 12. Spots of production nature |
Not allowed |
Allowed |
| 13. Presence of glue tape |
Allowed in non-sanded plywood |
| 14. Edge defects after cutting (splitting, scriber saw traces) and sanding |
Allowed within 2 mm from panel side |
Allowed withinа 5 mm from panel side |
Allowed withinа 5 mm from panel side |
Allowed withinа 5 mm from panel side |
Allowed within 5 mm from panel side |
| 15. Roughness parameterа per GOST 7016-82, mkm |
| -for sanded plywood |
100 |
| -for non-sanded plywood |
200 |
| 16. Warp |
Doesn`t apply to thickness under 5 mm, For plywood over 5 mm thick allowed up to 15 mm per 1m panelТs diagonal length |
