Correlation between the characteristics of teak and its location
The characteristics of a teak log are determined by its conformation, cylindrical and straightness, regularity of annual rings, colour and texture and presence or absence of black stripes and beeholes. A study has indicated that there are variations in the characteristics of teak based on its location. Weather and soil have a great impact on the characteristics of teak. It is probable that weather has a greater effect on the characteristics of teak. The differences between teak trees which grow in heavy rain regions and those which grow in light rain regions are as follows:
| Heavy Rain Region | Light Rain Region |
| Large girth | Small girth |
| Irregular annual rings | Regular annual rings |
| Low density | High density |
| Poor colour (dark) | Good colour (bright, yellow) |
| Presence of bee-holes | Absence of bee-holes |
| No striped | Black striped |
| Good for saw milling | Good for veneer production |
Classified area-wise characteristics of Myanmar teak logs are stated as follows:
Remarks:
(I) Grade A, B+ and B logs are found to be suitable for Veneering.
(II) Grade C+ logs assumed as marketable for veneering purpose but rather poor.
(Ill) Grade D logs are found to be suitable for milling only.
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Special Market Specifications
These specifications intended for dimensions stock such as Decks and Margin pieces , shall have only one grade in each case .
General Requirement : These shall be well manufactured with cross sections rectangular throughout ; sawn full , thickness and width being 1/8" ( 0.30 cm ) full to the normal dimensions at the time of milling ; fairly straight grained , sound and free from injurious worm or beeholes splits . shakes , sapwood , large knots not exceeding 1,25" ( 3.80 cm ) diameter or unsound knots , corner knots , ingrown bark , wane , heart centres , or imperfections due to heart centre , excessive discoloration and rot , or other injurious defects , unless otherwise specified.
Decks : Upper face and the upper half of the calking edge shall be clear . One perfectly sound knot , but exceeding 1" ( 2.60 cm ) in diameter for every 10' ( 3 meter ) will be allowed . For decks of 10' ( 3 meter ) and longer up to 20' ( 6 meter ) two knots will be allowed provided that the distance between the knots is not less than one-third of the length of the piece . For decks longer than 20' ( 6 meter ) , three knots will be allowed , and the distance between each should be at least one - third of the length of the piece