Description
INTRODUCTION
This Medium Hardwood is known as Kapur (Dryobalanops spp/Dipterocarpaceae). The wood is reddish brown.
Also known as Kapur (Brunei); and Kamper, Kapur and Petanang (Indonesia).
USES
The timber is suitable for medium construction, posts, beams, joists, rafters, door and window frames and sills, fender supports, flooring, staircase (treads, stringers, round end and winder), pallets (heavy and permanent types) and column (light duty).
SHRINKAGE
The shrinkage of some species are summarised below:
| Species |
Shrinkage (%) (Green to air dry) |
Remarks |
|
|
Radial |
Tangential |
||
| D. aromatica |
2.1 |
4.6 |
Very high shrinkage. |
| D. oblongifolia |
1.7 |
3.8 |
High shrinkage. |
| D. rappa |
1.5 |
5.1 |
Very high differential shrinkage. |
STRENGTH PROPERTIES
The timber falls into Strength Group B (Engku, 1988b) or SG 4 (MS 544:Part 2:2001).
Strength Properties of Kapur
| Species |
Test condition |
Modulus of Elasticity (MPa) |
Modulus of Rupture (MPa) |
Compression parallel to grain (MPa) |
Compression perpendicular to grain (MPa) |
Shear strength (MPa) |
| D. aromatica |
Green |
15,900 |
84 |
46.5 |
4.2 |
8.4 |
|
Air dry |
18,700 |
114 |
61.7 |
5.5 |
10.5 |
|
| D. oblongifolia |
Green |
13,200 |
73 |
39.2 |
5.1 |
8.1 |
|
Air dry |
– |
– |
– |
– |
– |
Sizes
- Thicknesses of 25mm, 35mm, 50mm, 75mm, 100mm
- Widths of 25mm, 50mm, 75mm, 100mm, 125mm, 150mm, 175mm, 200mm
- Lengths of 3-6ft & 8ft and up
Characteristics
Density
- Medium Hardwood
- 580-820 kg/m3 air dry
Durability
- Moderate
- 6-10 years
- Anti-fungal
Speciality
- Good for roof, posts, staircase and columns