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Feb 2015
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SAWN TIMBER OF HARDWOODS. SPECIFICATIONS.
Requirements in accordance with GOST 2695-83
| # |
Parameter, attribute, defect of wood,
its arrangement |
Requirements on grades |
| 1 grade |
2 grade |
3 grade |
| 1 |
Species of wood |
hardwoods (deciduous, under the specification of the
buyer) |
| 2 |
Nominal length, m:
from hard-grained deciduous species |
from 0,5 up to 6,5 with gradation 0,10 |
| from soft deciduous species |
from 0,5 up to 2,0 with gradation 0,10
and from 2,0 up to 6,5 with gradation 0,25 |
| 3 |
Deviations from nominal thickness, mm |
from -25 up to +50 |
| 4 |
Nominal thickness, mm |
19, 22, 25, 32, 40, 45, 50, 60, 70, 90, 100 |
| 5 |
Deviations from nominal thickness, mm,
at thickness up to 32 mm |
from -1,0 up to + 1,0 |
| at thickness more than 32 mm |
from -2,0 up to + 2,0 |
| 6 |
Nominal width, mm:
square edged sawn timber |
60, 70, 80, 90, 100, 110, 130, 150, 180,
200 |
| unedged and one-edge square edged sawn timber |
50 and more with gradation 10 |
| 7 |
Deviations from nominal width square edged sawn
timber, mm, at width up to 100 mm |
from -2,0 up to +2,0 |
| at width more than 100 mm |
from -3,0 up to +3,0 |
| 8 |
The least face width of of unedged sawn timber,
mm |
40 |
| 9 |
Sound intergrown knots, the size of not taken into
account knots, except for group knots, mm |
10 |
20 |
50 |
the permitted size of knots (the sum of the sizes of
knots), mm / number for 1 m length:
on faces at width up to 100 mm |
20/1 |
50 (but no more than 50 % of width)/2 |
(300)/allowed |
| at width from 100 up to 200 mm |
20/2 |
50/3 |
(300)/allowed |
| at width from 210 up to 400 mm |
40/2 |
50/3 |
(300)/allowed |
| at width over 400 mm |
40/2 or 60/1 |
50/3 or 70/2 |
(300)/allowed |
on edges of square edged sawn timber, the size in percentage of
thickness, number of knots, at thickness:
up to 32 mm |
33/1 |
50/1 |
allowed |
| from 40 up to 60 mm |
33/2 |
50/2 |
allowed |
| 10 |
Partly intergrown sound knots and dead sound
knots, the size of not taken into account knots (except for group knots), mm |
- |
15 |
30 |
| on faces |
20 (in the general number of intergrown knots) |
40 (in the general number of intergrown knots) |
(150) |
| on edges of square edged sawn timber |
according to standards for intergrown knots |
(150) |
| 11 |
Loos knots, rotten and unsound knots, the size of not taken into
account knots (except for group knots), mm |
not allowed |
10 |
25 |
the numerator - the permitted size of knots (the sum of the sizes of knots), mm, the
denominator - quantity for 1 m length:
on faces |
not allowed |
40/1 |
(150) |
| on edges of square edged sawn timber |
not allowed |
according to standards for intergrown sound
knots |
| 12 |
Face cracks and edge cracks (on square edged
edges), including extended on the end: depth, percentage of thickness and length of sawn
timber |
16 |
33 |
50 |
| 13 |
Face cracks, extended on both ends, depth, percentage of thickness
of sawn timber |
not allowed |
20 |
30 |
| quantity of cracks, pieces |
not allowed |
1 |
1 in beech sawn timber with width more than 200 mm
the depth of crack have no limit |
| 14 |
Face and edge through cracks, including extending on the end,
length, percentage of length of sawn timber |
5 |
10 |
33 |
| 15 |
Ring shakes, length, percentage of length of sawn timber |
not allowed |
5 |
20 |
| 16 |
Face cracks, depth, percentage of width of sawn timber |
75 |
100 |
allowed |
| 17 |
Slant of fibres, % |
5 |
10 |
allowed |
| 18 |
Curly grain, the area, percentage from the area of sawn
timber's face |
25 |
allowed |
| 19 |
Bark pocket, length and width, percentage of length and width of
sawn timber:
one-sided |
5 |
10 |
allowed |
| through |
not allowed |
10 |
allowed |
| 20 |
Included sapwood |
not allowed |
allowed |
| 21 |
Fungus heartwood stains and strips, the area,
percentage from the area of face of sawn timber |
not allowed |
10 |
allowed |
| 22 |
Brown streak, the area, percentage from the area of face of sawn
timber |
not allowed |
5 |
15 |
| 23 |
Mould, surface blue |
stain, strips - are allowed. |
allowed |
| 24 |
Deep blue, the area, percentage from the area of sawn timber's
face |
not allowed |
10 |
20 |
| 25 |
Heartwood rot and sapwood rot, the area, percentage from the area
of sawn timber' face:
uneedged sawn timber |
not allowed |
5 |
10 |
| square edged sawn timber |
not allowed |
5 |
| 26 |
Hearwood and sapwood fungus brown rot |
not allowed |
| 27 |
Wormholes, quantity of holes for 1 m
length of sawn timber |
are not allowed, except for surface
wormholes on wane (with depth not more 3mm) |
3;
large - 1 piece |
5 |
| in oak sawn timber deep wormholes - are not
allowed |
| 28 |
Mechanical damages and defects of processing |
are allowed within the limits of a deviation
from the standard sizes |
allowed |
| 29 |
Foreign bodies and impurities |
not allowed |
| 30 |
Butt trimming, percentage of thickness or width of sawn timber |
5 |
5 |
5 |
| 31 |
Rough wane, the size of not sawed part, percentage of thickness or width of sawn timber |
20 |
33 |
50 |
| 32 |
Sharp wane, percentage of length of sawn
timber |
not allowed |
25 |
50 |
| 33 |
Bow, spring and twist, percentage from
length of sawn timber |
0,5 |
1,0 |
2,0 |
| 34 |
Cup, percentage from width of sawn timber |
1,0 |
2,0 |
3,0 |
| 35 |
Parameter of the roughness, Rm max, micrometer |
1250 |
| 36 |
Sapwood in square edged oak sawn timber:
the size, percentage from width |
50 |
allowed |
| the size, percentage from length |
33 |
50 |
allowed |
The note 1: The sizes of sawn timber on thickness and on 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 6782.2-75.
The note 2: The defects of the wood which has been not mentioned in the
table, are allowed.
The note 3: On edges of square edged sawn timber over 60 mm defects of wood
are allowed by thickness on the norms specified for a face.
The note 4: At moisture content of wood more 22% the sizes of permitted
cracks, bow, spring, cup and twist are decreased twofold.
The note 5: Spring in unedged sawn timber it is not standardized.
The note 6: The quality rating of quality of sawn timber should be made on
the worst face and worst edge.
The note 7: Sawn timber of third grade in length more than 3 m, on 50% which
of length of grade-making defects are not present, or there are only knots, not taken into
account in standards of 1 grade, or on 67% of lenth of which are defects in norms of 1
grade, are related to 2 grade.
The note 8: The presence of one knot with the sizes permitted for adjacent
lower grade in sawn timber with length over 3 m is allowed.
The note 9: Non-parallelity of faces and edges is allowed within the limits
of deviations from nominal thickness or width.
The note 10: Sawn timber are delivered dry (with moistness no more than
22%), natural dry or antiseptized.
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