The TreeThe 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 TimberThe 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;Malaysian kapur 790 kg/m3Sarawak kapur 750 kg/m3Sabah kapur 750 kg/m3Indonesian kapur 590 to 830 kg/m3(all when dried)
DryingReported to dry fairly well with only a slight tendency to warp and check.
StrengthFrom the results of limited tests it would seem that in the green state kapur is only slightly superior to teak 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 teak.
Working QualitiesMedium - Works moderately well with both hand and machine tools, but is variable in respect of dulling of cutting edges, but on the whole kapur is slightly better than the average run of keruing. Cutters should be kept well sharpened to avoid trouble from raised grain and to obtain a smooth finish. Takes nails, screws, stains and polish satisfactorily.
Latin NameDryobalanops spp, Dryobalanops aromatica, Dryobalanops oblongifolia, Dryobalanops lanceolata, Dryobalanops fusca, Dryobalanops beccarii
Also known asSarawak kapur, Sabah kapur, keladan, Malaysian kapur, Indonesian kapur
OriginSouth East Asia