Other Common Names: Takien-chan (Thailand), Kong, Karakong (India), Mindanao Narek, Narek (Philippines).
Distribution: B. heimii is widely distributed in the Malay Peninsula including Thailand south of Pattani. Other species reported in India and the Philippines.
The Tree: Stem diameters over 3 ft are common; boles mostly well-shaped and clear for 100 ft or more. A very large specimen with a diameter of 13 ft is reported.
General Characteristics: Heartwood light yellow brown with a distinct green tinge when fresh, changing on exposure to a dark brown or dark purple brown; sharply demarcated from the pale yellow sapwood. Luster moderate; grain usually only shallowly interlocked; texture fine and even; odor and taste not distinctive.
Weight: Basic specific gravity (ovendry weight/green volume) 0.76; air-dry density 58 pcf.
Mechanical Properties: (2-in. standard)
Moisture content Bending strength Modulus of elasticity Maximum crushing strength
(%) (Psi) (1,000 psi) (Psi)
Green (10) 17,680 2,630 10,000
16% 21,560 2,840 10,900
Janka side hardness 2,085 lb for green material and 2,130 lb for dry.
Drying and Shrinkage: The wood is slow drying and prone to surface checking. Shrinkage is reported to be low. Kiln schedule T2-C2 is suggested for 4/4 stock. Air-drying prior to kiln-drying is recommended.
Working Properties: Easy to work with both hand and machine tools but there is some tendency for saws to gum up; planes to a smooth surface and takes a very good polish.
Durability: Heartwood is very resistant to insect and fungal attack; but is reported as vulnerable to marine borers.
Preservation: Heartwood is reported as not treatable.
Uses: Heavy construction, railroad crossties, boatbuilding, utility poles, industrial flooring, vats, casks, and tanks.
Additional Reading:: (10), (11), (63)
10. Desch, H. E. 1941. Dipterocarp timbers of the Malay Peninsula. Malayan Forest
11. Desch, H. E. 1941-54. Manual of Malayan timbers. Malayan Forest Records No.
63. Thomas, A. V. 1955. Malayan timbers. . . Chengal. Malayan Forester 18:103-105.
From: Chudnoff, Martin. 1984. Tropical Timbers of the World. USDA Forest Service. Ag. Handbook No. 607.