အသင္း၀င္မ်ားဤေနရာတြင္
ေၾကာ္ျငာႏုိင္ပါသည္။


Knowledge Bank

Classification of FEQ

Serial
No.
Photo
(double click to enlarge)
Features
Quality
In
Preference
Quality
Acceptable in
General
Quality
Non-acceptable
In General
Quality
Acceptable
in
Negotiation

1.
Quarter Sawn
Quarter sawn lumber is produced by first quarter-
ing the log and then sawing it perpendicular to the growth rings. All of the boards sawn thus are of radial grain. When looking at the end grain, the annual growth rings will be at 90 degrees to each face. Quarter sawn lumber is termed “vertical grain” or “edge grain” in softwoods.
YES
-
-
-

2.
Semi-Quarter Sawn
That is very similar to quarter sawing, and has the same advantages and limitations. This method of sawing accentuates the vertical grain and minimizes the flake. The angle of the cut is changed slightly so that fewer saw cuts are parallel to the medullary rays, which are responsible for the flake effect. Simi-quarter sawn lumber prod-
uces an almost straight grain with practically no flake figure.
YES
-
-
-

3.
Flat Sawn
Flat sawn lumber is obtained by making the first saw cut on a tangent to the circumference of the log and the remaining cuts parallel to the first. This method
-
YES
-
-

4.
Round Grain
Rough appearance on the surface of timber is due to certain abnormalities of growth.
-
YES
-
-

5.
Wavy Grain
Similar to round grain in original but not serious in character as round grain.
-
WG-1
WG-2
WG-3
-
WG-4
WG-5

6.
Flame
Distortion of the wood fibers of tree which produce figures and highlights similar to a corrugated surface or ripples.
-
FL-1
FL-2
FL-3
-
FL-4
FL-5
FL-6
FL-7

7.
Sound Knot
A sound knot is solid across its face and is as hard as or harder than the surround-
ing wood to which it is firmly jointed; it shows no indication of decay.
-
YES
-
-

8.
Spike Knot
It is a portion of the branch which tried to come out of the trunk but actually it doesn’t come out and stays in the trunk and shows only a sharp mole on the surface area.
-
YES
-
-

9.
Dead Knot
Dead knot is a knot which is softer than the surrounding wood becau-
se it contains decay. If the decay is advanced there may be a hole in the centre of the knot.
-
-
YES
-

10.
Water Stain
The water stain is the discoloration of the timber caused by the sinking of water into the log through sun crack and air crack while it was left out of shelter.
-
YES
-
-

11.
Stain And Oxidation Color
Shall be unavoidable nature of Teak Wood and not considered as defects. These are internationally recognition and accept-
ance as natural beauty of Teak Wood.
-
-
-
YES

12.
Chalk Vein
Chalk vein is whitish line in color on some pieces which may caused mark in appearance but do not reduce the strength.
-
CV-1
CV-2
CV-3
CV-4
CV-6
CV-5

13.
Black Streak Or Oil Streak
Blackish line in color on some pieces which are considered as defect from the point of view of appearance but do not effect the strength of the timber.
-
BS-1
BS-2
BS-3
-
BS-4
BS-5
BS-6

14.
Sap Wood
It is the outer part of the trunk and the most nearest to the bark. Mostly the color is different from the inner layer and has less endurance.
-
-
YES
-

15.
Pin Hole
These are pin size holes on the timber.
-
-
YES
-

16.
Sun Crack
The crack occurred on the surface of the timber. In this case the crack which comes from the inner part is not the sun crack.
-
-
YES
-

17.
Air Crack
The crack caused by the split wood fibers.
-
-
YES
-

18.
Bee Hole
Holes in the wood caused by the larvae of XYLEUTES CERAMICA.
-
-
YES
-

19.
Chalk Pocket
The hole filled by the chalk like solid substances in the timber.
-
-
YES
-

20.
Heart Crack
The cracked line which started from the middle of the heart and comes out to the outer layer.
-
-
YES
-

21.
In-Bark
The bark which has been embedded in the fiber caused by late growth.
-
-
YES
-