Description
INTRODUCTION
This Medium Hardwood is also known as Dipterocarpus spp. (Dipterocarpaceae). The heartwood is red-brown to purple-red and darkens on exposure. The surface of the timber may be rather resinous and sticky when handled. Keruings that are believed to give the best yield of oleo-resin.
Also known as Keruing (Brunei); Khlong and Thbaeng (Cambodia); Gurjan (India); Keruing, Kerup, Lagan and Tempudau (Indonesia); Mai nyang, Mai kung, Mai sat, Muak and Nha:ng (Laos); Eng, In, Kanyin and Kayin (Myanmar); Apitong and Panau (Philippines); Hora (Sri Lanka); and Heng, Hiang , Hieng, Plung, Yang, Yang-khon, Yang-na and Yang-pai (Thailand).
USES
This timber is suitable for heavy construction, posts, beams, joists, rafters, ship and boat building (keels, keelsons and framework), vehicle bodies (framework, floor boards and planking), container flooring and when treated, suitable for railway sleepers, harbour works, bridges, power-line poles and telegraph poles.
SHRINKAGE
|
Species |
Shrinkage (%) (Green to air dry) |
Remarks |
|
|
Radial |
Tangential |
||
| D. baudii |
2.3 |
5.6 |
Very high shrinkage |
| D. cornutus |
3.1 |
5.1 |
Very high shrinkage |
| D. costulatus |
2.9 |
3.3 |
High shrinkage |
| D. crinitus |
2.1 |
3.5 |
High shrinkage |
| D. grandiflorus |
1.6 |
4 |
High shrinkage |
| D. kerrii |
2.6 |
6.6 |
Very high shrinkage |
| D. kunstleri |
2.6 |
5.4 |
Very high shrinkage |
| D. lowii |
2.7 |
4.5 |
Very high shrinkage |
| D. sublamellatus |
2 |
5.5 |
Very high shrinkage |
| D. verrucosus |
3.1 |
7.4 |
Very high shrinkage |
STRENGTH PROPERTIES
The timber falls into Strength Group B (Engku, 1988b) or SG 5 (MS 544:Part 2:2001).
Sizes
- Thicknesses of 25mm, 50mm
- Widths of 50mm, 75mm, 100mm
- Lengths of 3-6ft & 8ft and up
Characteristics
Density
- Medium Hardwood
- 690-945 kg/m3 air dry
Durability
- Moderate