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ООО "ИмпортЭкс"

Россия, г. Новосибирск

ул.Инженерная, 5

ICQ: 

485-009-012

Тел/факс: 

8 (383)217-43-79

E-Mail:

importex2008@yandex.ru

Контактное лицо:

Татьяна   


Представительство

s.r.o "SibWood"

Чехия, г. Прага 3

ул. Borivojova, 878/35

Raiffeisenbank a.s.

Olbrachtova 9, 14021 Praha 4

SWIFT: RZBC CZ PP

IBAN: CZ

3255 0000 0000 501100 8385

GOST 8486-86

SAWN TIMBER OF SOFTWOODS
Technical requirements in accordance with GOST 8486-86 and GOST 24454-80
#
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 thickness/ 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 and mould:
surface
not allowed
not allowed
deep blue, the area,  percentage from the area of sawn timber
10
20
50
not 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.
Rambler's Top100 GOST 8486-86 © 2008 ООО ИмпортЭкс
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