| # |
Parameter, attribute, defect of wood,
its arrangement |
Requirements on grades |
| Select (0 grade) |
1 grade |
2 grade |
3 grade |
4 grade |
| 1 |
Species of wood |
coniferous species (under the specification of the buyer) |
| 2 |
Nominal length, m:
for domestic market and export |
from 1,0 up to 6,5 with gradation 0,25 |
| for manufacturing container |
from 0,5 with gradation 0,1 |
| for bridge blocks |
3,25 |
| for export |
from 0,9 up to 6,3 with gradation 0,3 |
| 3 |
Deviations from nominal length, mm |
from -25 up to +50 |
| 6 |
Deviations from nominal thickness and width, mm,
at the nominal sizes:
up to 32 mm inclusive |
from -1 up to +1 |
| from 40 up to 100 mm inclusive |
from -2 up to +2 |
| more than 100 mm |
from -3 up to +3 |
| 7 |
The least face width of unedged sawn timber, mm, at
nominal thickness: from 16 up to 50 mm |
50 |
| from 60 up to 100 mm |
60 |
| from 125 mm and more |
60 % of thickness |
| The note 1: The sizes of sawn timber on thickness and width
are established for moisture content of 20%. At the greater or smaller moistness the sizes
should be more or less on size of shrinkage in accordance with GOST 6782.1-75. |
| 8 |
Sound intergrown knots:
diameter in percentage of width/ number for 1 m length, pieces:
face knots and arris knots |
20/2 |
25/3 |
33/4 |
50/4 |
allowed |
edge knots:
at thickness up to 40 mm |
33/1 |
50/2 |
67/2 |
allowed/2 |
| 40 mm and more |
25 (but no more than 15 mm) / 2 |
33/2 |
50/3 |
allowed/3 |
| 9 |
Partly intergrown knots and dead knots,
diameter in percentage of width / number on 1 m length (in the sum with intergrown
knots), pieces:
face knots and arris knots |
12,5/2 |
20/2 |
25/3 |
33/3 |
50/4 |
edge knots:
at thickness up to 40 mm |
25/1 |
33/1 |
50/2 |
allowed/2 |
allowed/2 |
| 40 mm and more |
10 mm / 1 |
25/2 |
33/2 |
67/2 |
allowed/3 |
| 10 |
Rotten and unsound knots |
not allowed |
diameter - on standards for intergrown and dead knots, number - no more than half
from their allowed quantity |
The note 2: Diameter of a knot is measured on distance
between two straight linees concerning a knot, parallel to a longitudinal axis of sawn
timber.
The note 3: Knots with diameter less from 50% from permitted value are not
taken into account.
The note 4: The stepson are normalized as dead knot, in the perfect grade
stepson is not allowed.
The note 5: One knot with diameter on sizes of adjacent lower grade in sawn
timber with length more than 3 m is allowed.
The note 6: On the area of length, that is equal to width of sawn timber,
the sum of the sizes of knots on the direct line crossing this area in any direction,
should not exceed the permitted diameter of a knot.
The note 7: Spike knots and two-edges arris knots with with the size on a
small axis up to 6 mm and depth up to 3 mm in sawn timber more than 40 mm (except for a
perfect grade) are allowed
The note 8: The number of knots is not standardized for cants (thickness and
width of 100 mm and more). |
| 11 |
Face and edge cracks, including cracks, extended on the end,
length, percentage of length of sawn timber:
shallow (with deep less 5mm or less 1/10 of thickness for sawn timber with thickness
more than 50mm) |
16 |
25 |
33 |
50 |
allowed |
| deep (with deep more than 5mm or more 1/10 of thickness for sawn
timber with thickness more than 50mm) |
10 |
16 |
33 |
50 |
| 12 |
Face through cracks, including extending on the end:
length, mm |
100 |
150 |
200 |
- |
- |
| length, percentage of length of sawn timber |
- |
- |
- |
16 |
25 |
| 13 |
End shakes (except for cracks from shrinkage
(checks)), length, percentage of width of sawn timber |
not allowed |
25 |
33 |
50 |
allowed |
| (on one of the ends) |
| The note 9: The permitted sizes of cracks are specified for
sawn timber with moisture content of 22%. At the greater moisture these sizes have to been
reduced twice. |
| 14 |
The cross grain, % |
5 |
allowed |
| 15 |
Compression wood, percentage from the face area of sawn
timber |
not allowed |
20 |
allowed |
| 16 |
Gum pockets:
number for on 1 m length of sawn timber, pieces |
1 |
2 |
4 |
allowed |
| gum pocket length (on one side of sawn timber), mm |
50 |
allowed |
| 17 |
The pith and a double pith |
not allowed |
allowed |
| without ring shakes and radial cracks in sawn timber with thickness of 40
mm and more |
not allowed |
allowed |
| 18 |
Bark pocket (one-sided): width,
percentage of width of sawn timber |
not allowed |
10 |
20 |
25 |
allowed |
| length, percentage of length of sawn timber |
5 |
10 |
10 |
| 19 |
Cancer, length, percentage of length of sawn timber |
not allowed |
20, but no more than 1 m |
33 |
allowed |
| 20 |
Fungus heartwood stains, the area, percentage from the
area of face of sawn timber |
not allowed |
10 |
20 |
allowed |
| 21 |
Blue stain and mould:
surface |
not allowed |
not allowed |
allowed |
| deep blue, the area, percentage from the area of sawn timber |
10 |
20 |
50 |
allowed |
| 22 |
Rot: |
not allowed |
| Motley heartwood rot as spots and strips, the area, percentage
from the area of sawn timber |
not allowed |
10 |
| 23 |
Wormholes, number of holes for 1 m length of sawn
timber, pieces |
not allowed
(except for shallow on wane part) |
2 |
3 |
6 |
| 24 |
Foreign bodies and impurities |
not allowed |
| 25 |
Sharp wane,
width of unsawed face in percentage to the width of sawn timber |
not allowed |
50 |
| width of unsawed edge in the percentage of the length of sawn
timber |
25 |
| 26 |
Rough wane:
on faces and edges without limitation on length, the size of unsawed part in
percentage of width |
16 |
16 |
16 |
33 |
allowed |
| the size of unsawed part on separate sections of edges in the percentage
of width |
33 |
33 |
33 |
66 |
| length of the section in percentage of length of sawn timber |
16 |
16 |
16 |
25 |
| 27 |
Butt trimming,
percentage of width or thickness of sawn timber |
5 |
5 |
5 |
5 |
5 |
| 28 |
Tooth marks, snaking, shears, depth, mm |
no more than deviations from nominal thickness or width |
3 |
allowed |
| 29 |
Bow, spring and twist,
height of curvature in percentage of width of sawn timber |
0,20 |
0,20 |
0,20 |
0,40 |
allowed |
| 30 |
Cup, height of curvature in percentage of width of sawn
timber |
1 |
1 |
1 |
2 |
allowed |
The note 10: Norms on warp are established for sawn timber
with moisture of 22%. At the greater moisture the norms have to be reduced twice.
The note 11: The defects of the wood which has been not mentioned in the
table are allowed.
The note 12: Sawn timber are delivered dry (moisture no more than 22%),
natural dry or antiseptized natural dry.
The note 13: The quality rating of sawn timber should be made on the worst
face and worst edge. |
