Ukrainian state standards of round timber products
Round timber hardwoods. Requirements in accordance with GOST 946288
Saw logs of the hardwoods, delivered for export. Specifications
Pulpwood for export. Specifications
The basic defects and their account
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ROUND TIMBER HARDWOODS. Requirements in accordance with GOST 946288
SAW LOG HARDWOODS GENERAL PURPOSE
Requirements in accordance with GOST 946288
¹ 
Parameter, attribute 
The requirement 
1 grade 
2 grade 
3 grade 
1 
Breed of wood 
all species 
2 
Nominal length, m:
oak, beech, ash, elm, maple, hornbeam 
from 1,0 up to 6,0 with gradation 0,1 
other species 
from 2,0 up to 6,0 with gradation 0,25 
3 
Deviations from nominal length, m:
at length 1,0  1,9 m 
from +0,03 up to +0,05 
2,0 m and more 
from +0,03 up to +0,10 
4 
Least diameter of a log, cm 
14 (for processing on millingsawing machine tools 
12) 
5 
Diameter of the greatest knot and the stepson, cm 
3 
10 
allowed 
6 
Diameter of a tobacco knot, cm 
not allowed 
4 
7 
7 
Thickness of a cutting heartwood rot and hollow heart,
shares of diameter of a buttend:
at diameter of a buttend up to 24 cm 
0,10 
0,25 
0,33 
(on one of buttends) 
26  38 cm 
0,25 
0,33 
0,33; at length up to 3 m  0,50, at the second
buttend  0,25 
(on one of buttends) 
40 cm and more 
0,33 
0,50 
0,50, at the second buttend  0,25 
(on one of buttends) 
8 
Brown streak 
not allowed 
allowed without white spots and efflorescences 
allowed 
9 
Depth of sapwood rot, shares of diameter of a buttend 
not allowed 
0,10 
0,10 
10 
External mouldering rot 
not allowed 
11 
Thickness of a cutting of fissures (except for checks from shrinkage), shares of
diameter of a buttend 
0,33 
0,33 
allowed 
12 
Depth of lateral cracks from shrinkage, shares of diameter of a buttend 
0,05 
0,20 
0,20 
13 
Length of end shakes from shrinkage 
no more an allowance on length 
no more than diameter of the top buttend 
14 
Wormhole 
not allowed 
allowed 
15 
Height of sweep, interests percentage of the length of a log:
simple 
1,0 
1,5 
2,0 
complex 
0,5 
0,75 
1,0 
16 
Depth of the mechanical damages, open bark pocket, scar and canker, cm 
the sum of the top end face of 0,1 diameters and
halfdifference diameters in a place of damage and to the top end face 
allowed 
17 
Thickness of a cutting of mechanical damages, bark pockets, scars, cheks from
shrinkage, shares of diameter of a log 
0,33 
0,50 
allowed 
18 
Height of knots (from a bark), cm 
2 
2 
2 
19 
Butt trimming 
not more than allowance on length 
20 
Volume of defective logs in a party(set) (not appropriate to requirements on item
119), % 
3,0 
21 
Parity(ratio) of the prices on birch saw log and the saw logs of others soft foliferous
species (length 2,0  6,0 m) 
100 (the basic price) 
77 
65 
22 
Parity(ratio) of the prices on hardwood saw log species (length 3,0  4,0, diameter
25  44 cm):
oak, ash, elm 
100 (the basic price) 
81 
72 
beech 
76 
63 
54 
23 
Correction factor to the basic price of logs of hardwood
species of the various sizes 
nominal length of logs, m 
1,0  2,9 
3,0  4,0 
4,1  6,0 
Diameter of logs up to 24 cm incl. 
0,76 
0,91 
1,13 
26  44 cm 
0,82 
1,00 
1,23 
46 cm and more 
0,88 
1,09 
1,34 
24 
The price of defective logs, at volume of defective logs in a party(set) (sample):
up to 3,0 % 
it is equal to the price of suitable logs
of the 3 grade on item 21 
3,1 % and more 
45 % from the basic price 
25 
Factor of switch of the piled volume of logs with a bark in
dense volume without a bark (on OST 134379) 
at nominal length of logs, m 
3,0  3,9 
4,0  5,5 
5,6  6,5 
trams without a hat, automobiles 
0,64 
0,59 
0,57 
trams with a hat:
zone dimension 
0,63 
0,58 
0,58 
usual dimension 
0,60 
0,55 
0,54 
SKI LOG HARDWOODS
Requirements in accordance with GOST 946288
¹ 
Parameter, attribute 
The requirement
1 grade 
1 
Breed of wood 
birch, maple, hornbeam, èëüì, a beech, an ash 
2 
Nominal length, m:
birch 
1,5 
birch, maple, elm, beech, ash, hornbeam 
from 2,0 up to 2,4 with gradation 0,10 
3 
Deviations (rejections) from nominal length, m:
at length of 1,5 m 
from +0,03 up to +0,05 
from 2,0 up to 2,4 
from +0,03 up to +0,10 
4 
Least diameter of a log, cm 
16 
5 
Diameter of the greatest knot and the stepson, cm 
3 
6 
Tobacco knots 
not allowed 
7 
Thickness of a cutting of kernel decays and hollow, shares of diameter of a buttend
(at both a buttends) 
0,33 
8 
Brown streak, sapwood rot, external mouldering decay, a wormhole (except surfaces) 
not allowed 
9 
Thickness of a cutting of a false kernel, share of diameter of a buttend
at diameter of a buttend up to 26 cm 
0,5 
26 cm and more 
0,6 
10 
Thickness of a cutting of cracks (except for cracks from shrinkage), shares of
diameter of a buttend 
0,33 
11 
Depth of lateral cracks from shrinkage, shares of diameter of a buttend 
0,05 
12 
Depth of face cracks from shrinkage 
not more than allowance on length 
13 
Height of sweep, percentage from length of a log:
simple 
1,0 
at diameter of a log up to 24 cm 
1,0 
26 cm and more 
2,0 
complex 
allowed at a rate of half of norm of simple sweep 
14 
Depth of mechanical damages of bark pocket, scar and a canker 
the sum of the top buttend of 0,1 diameters and halfdifference
diameters in a place of damage and at the top buttend 
15 
Thickness of a cutting of mechanical damages, bark pocket, scars, cracks from
shrinkage, a share of diameter of a log 
0,33 
16 
Height of knots (from bark), cm 
2 
17 
Butt trimming 
not more than allowance on length 
VENEER LOG HARDWOODS (FOR PEELING)
Requirements in accordance with GOST 946288
¹ 
Parameter, attribute 
The requirement 
1 grade 
2 grade 
1 
Breed of wood 
oak, maple, ash, birch, poplar, elm, beech, hornbeam,
alder, aspen, linden 
2 
Nominal length, m 
1,3; 1,6; 1,91; 2,23; 2,54 and multiple to them 
3 
Deviations(rejections) from nominal length, m:
blocks 
from +0,02 up to +0,05 
long pole from 2 blocks 
from +0,04 up to +0,15 
long pole from 3 blocks 
from +0.06 up to +0,20 
long pole from 4 blocks 
from +0.08 up to +0,25 
4 
Least diameter of a log, cm:
at length 1,3 and 1,6 
16 
16 
at the greater length 
18 
18 
5 
Diameter of the greatest knot and the stepson, cm 
3 
7 
6 
Diameter of a tobacco knot, cm 
not allowed 
4 
7 
The greatest thickness of a cutting of kernel decays and hollow, cm 
10 
10 
8 
External mouldering decay, lateral cracks from shrinkage 
not allowed 
9 
Brown streak 
not allowed 
allowed without white spots and efflorescences 
10 
Depth of sapwood rot, shares of diameter of a buttend 
not allowed 
0,10 
11 
Wormhole superficial and deep 
not allowed 
allowed 
12 
Height of sweep, percentage from length of a log:
simple at diameter of a log, cm:
16  18 
1,0 
1,0 
2024 
1,0 
2,0 
26 and more 
2,0 
3,0 
complex 
allowed at a rate of half of norm of simple sweep 
13 
The least depth of a zone peeling (without bark pocket, scar, canker, cracks,
mechanical damages) in any part of radius at a buttend of a log (but 4 cm from the centre
and not closer), cm 
5 
4 
14 
The least angle between kerbs of tendrilsof the grownin knots at birch logs, degree 
120 
allowed 
15 
The least ratio of cross diameter of a wound stain from grownin knots to longitudinal
(not less):
beech, hornbeam, linden, alder, aspen, poplar 
2:1 
allowed 
oak, maple, ash 
3:1 
allowed 
16 
Height of knots (from bark), cm 
2 
PLANING LOG HARDWOODS
Requirements in accordance with GOST 946288
¹ 
Parameter, attribute 
The requirement 
1 grade 
2 grade 
1 
Breed of wood 
all hardwoods 
2 
Nominal length, m 
from 1,5 with gradation 0,1 
3 
Deviations from nominal length, m:
at length 1,5  1,9 m 
from +0,03 up to +0,05 
2,0 m and more 
from +0,03 up to +0,10 
4 
Least diameter of a log, cm 
24 
5 
Diameter of the greatest knot and the stepson, cm 
3 
10 
6 
Diameter of a tobacco knot, cm 
not allowed 
4 
7 
Thickness of a cutting of kernel decays andhollow (on one of buttends), shares of
diameter of a buttend:
At diameter of a buttend of 24 cm 
0,10 
0,25 
26  38 cm 
0,25 
0,33 
40 cm and more 
0,33 
0,50 
8 
Brown streak 
not allowed 
allowed without white spots and efflorescences 
9 
Depth of sapwood rot, shares of diameter of a buttend 
not allowed 
0,10 
10 
External mouldering decay 
not allowed 
11 
Thickness of a cutting of cracks (except for cracks from shrinkage), shares of
diameter of a buttend 
0,33 
0,33 
12 
Depth of lateral cracks from shrinkage, shares of diameter of a buttend 
0,05 
0,20 
13 
Length of face cracks from shrinkage 
not more than allowance on length 
not more than diameter of the top buttend 
14 
Wormhole 
not allowed 
allowed 
15 
Height of sweep, percentage from length of a log:
simple 
1,0 
1,5 
complex 
0,5 
0,75 
16 
Depth of the mechanical damages, open bark pocket, scar and canker, cm 
the sum of the top end face of 0,1 diameters and
halfdifference diameters in a place of damage and to the top end face 
17 
Thickness of a cutting of mechanical damages, bark pocket, scar and canker, cm 
0,33 
0,50 
18 
Height of knots (from bark), cm 
2 
19 
Butt trimming 
not more than allowance on length 
MATCH LOG HARDWOODS
Requirements in accordance with GOST 946288
¹ 
Parameter, attribute 
The requirement 
1 grade 
2 grade 
1 
Breed of wood 
aspen, poplar, linden, alder 
2 
Nominal length, m 
2,0 and more with gradation 0,1 
3 
Deviations from nominal length, m 
from +0,03 up to +0,10 
4 
Least diameter of a log, cm 
16 
5 
Diameter of the greatest knot and the stepson, cm 
3 
7 
6 
Diameter of a tobacco knot, cm 
not allowed 
4 
7 
Thickness of a cutting kernel decays and hollow, shares of diameter of a buttend (on
one of buttends):
at diameter of a buttend up to 24 cm 
0,10 
0,25 
26  38 cm 
0,25 
0,33 
40 cm and more 
0,33 
0,50 
8 
Brown streak 
not allowed 
allowed without white spots and efflorescences 
9 
Depth of sapwood rot, shares of diameter of a buttend 
not allowed 
0,10 
10 
External mouldering decay 
not allowed 
11 
Thickness of a cutting of cracks (except for checks from shrinkage), shares of
diameter of a buttend 
0,33 
0,50 
12 
Depth of lateral cracks from shrinkage, shares of diameter of a buttend 
0,05 
0,20 
13 
Length of face end shakes from shrinkage 
not more than allowance on length 
not more than diameter of the top buttend 
14 
Wormhole (deep and superficial) 
not allowed 
allowed 
15 
Height of sweep, percentage from length of a log:
simple:
at diameter of a log up to 24 cm 
1,0 
2,0 
26 cm and more 
2,0 
3,0 
complex 
allowed at a rate of half of norm of simple sweep 
16 
Depth of the mechanical damages, open bark pocket, scar and canker,
cm 
the sum of the top buttend of 0,1 diameters and
halfdifference of diameters of a log in a place of damage and on the top buttend 
17 
Height of knots (from bark), cm 
2 
18 
Butt trimming 
not more than allowance on length 
CONSTRUCTION LOG HARDWOODS
Requirements in accordance with GOST 946288
¹ 
Parameter, attribute 
The requirement
2 grade 
1 
Breed of wood 
all hardwoods 
2 
Nominal length, m 
from 4,0 up to 6,5 with gradation 0,5 
3 
Deviations from nominal length, m 
from +0,03 up to +0,10 
4 
Least diameter, cm 
from 12 up to 24 
5 
Diameter of the greatest knot or the stepson, cm 
7 
6 
Heartwood, external mouldering rot and tobacco knots 
not allowed 
7 
Brown streak 
allowed without white spots and efflorescences 
8 
Depth of sapwood rot, shares of diameter of a buttend 
0,1 
9 
Thickness of a cutting of cracks (except for checks from
shrinkage), shares of diameter of an end face 
0,50 
10 
Depth of lateral cracks from shrinkage, shares of diameter of
a buttend 
0,2 
11 
Length of face cracks from shrinkage 
not more than diameter of the top buttend 
12 
Height of sweep, percentage from length of a log:
simple 
2 
complex 
1 
13 
Depth of mechanical damages open bark pocket, scar and
canker, cm 
the sum of the top end face of 0,1 diameters and
halfdifference of diameters in a place of damage and on the top buttend 
14 
Height of knots (from bark), cm 
2 
15 
Butt trimming 
not more than allowance on length 


