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November 24, 2009

Kapur

Species: Dryobalanops Aromatica (Indonesian Kapur)

Wood Type: Hardwood

Environmental: Not listed in CITES, but believed available from well-managed sources.

Introduction: Various species of the genus Dryobalanops are distributed over part of Malaya, Sumatra, and Borneo, including Sarawak, Brunei, Sabah and East Kalimantan. The various species comprising kapur are given below.

Names/Types: Dryobalanops aromatica Gaertn. f. and D. oblongifolia Dyer, produce Malaysian kapur for export, but locally the latter species is known as keladan.
Dryobalanops aromatica Gaertn. f. D. lanceolata Burck., and possibly other species produce Sarawak kapur.
Dryobalanops lanceolata Burck, and D. beccarii Dyer, and possibly other species produce Sabah kapur.
Dryobalanops aromatica Gaertn. f. and D. oblongifolia Dyer are the principal species producing Indonesian kapur shipped from Sumatra.
Dryobalanops aromatica Gaertn. f., D. oblongifolia Dyer. D. beccarii Dyer., D. fusca V.SI. and D. lanceolata Burck, and possibly other species produce Indonesian kapur shipped from Borneo.



Kapur Timber

Kapur Timber



The Tree: The trees vary according to species and environment, but usually they are very large, often reaching a height of 60m and a diameter of 1.5m to 2.0m with slightly tapering boles some 30m long above the buttresses. Although tending to grow gregariously, it never forms pure stands.

The Timber: The sapwood is whitish to yellowish-brown in colour, up to 75mm wide, and clearly defined from the heartwood, which is a light rose-red when freshly cut, becoming rose-red to reddish-brown on exposure, often (particularly when fresh) with a pronounced camphor-like odour. It is fairly straight grained, moderately coarse but even textured, and is moderately hard and heavy. There is often a superficial resemblance to keruing, but on examination of end grain it will be seen that kapur has continuous gum ducts in concentric lines. These individual canals are smaller than the vessels, and are often filled with white resin; this does not exude over the surface of the wood. The different species vary somewhat in weight, but on average they are as follows:


Kapur Hardwood

Kapur Hardwood



Indonesian Kapur 830 kg/m3 when dried.

Drying: Reported to dry fairly well with an excellent resistance to warp and check.

Strength: From the results of tests it would seem that in the green state Kapur is superior to Tectona in general strength properties, but when dried, it is harder, and some 15 per cent stronger in bending, and about 50 per cent stiffer and more resistant to suddenly applied loads than Tectona.

Working Qualities: Medium - Medium

Durability: Durable

Moisture Movement: Medium

Density (mean, Kg/m³): 770

Texture: Medium

Availability: Variable

Price: Medium

Chemical Properties: Camphor like odor, especially when freshly cut

Use(s): Exterior joinery, indoor/outdoor furniture, flooring, outdoor/marine decking

Colour(s): Reddish brown

Air Dry Density: 575-815 Kg/m³

Strength Group: B

Static Bending:
¤ MOE 13,000-18,700 N/nm²
¤ MOR 144-126 N/nm²

Compression Strength:
¤ Perpendicular to Grain 5.52 N/nm²
¤ Parallel to Grain 61.70-69.60 N/nm²

Shear Strength: 10.50 - 13.60 N/nm²

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