Gaham Badak

INTRODUCTION

The common Malaysian name for the timber of Blumeodendron spp. (Euphorbiaceae). The ASEAN Standard Name for the timber, which is of Indonesian origin, is TENGKURUNG. Vernacular names applied to the timber include gangulang (Sabah), gelugor hutan (Peninsular Malaysia), medang lempong (Peninsular Malaysia) and merbulan (Sarawak). Major species include B. kurzii and B. tokbrai. The heartwood, which is light brown in colour, is not distinct from the lighter coloured sapwood. Occasionally, a corewood of darker brown with black streaks is produced.

Also known as Tengkurung (Indonesia); and Lindog (Philippines).


DENSITY

The timber is moderately hard and moderately heavy with a density of 625-895 kg/m3 air dry. The timber is classified under Light Hardwood in Malaysia.


NATURAL DURABILITY

The timber is non-durable.


PRESERVATIVE TREATMENT

It is easily treated with preservatives.


TEXTURE

Texture is moderately coarse and even with straight or shallowly interlocked grain.


STRENGTH PROPERTIES

The timber falls into Strength Group C (Burgess, 1958).


MACHINING PROPERTIES

It is easy to resaw and cross-cut. Planing is easy and the planed surface produced is smooth.


NAILING PROPERTY

Nailing property is good.


AIR DRYING

Seasoning is fairly slow. 13 mm thick boards take 4 months to air dry, while 38 mm thick boards take 5 months. Seasoning defects include moderate end-checking, attacks by fungi and insects, slight cupping, bowing and splitting.


SHRINKAGE

Shrinkage is very high. Radial shrinkage averages 2.9%, while tangential shrinkage averages 5.3%.


USES

The timber is suitable for internal use, shuttering, furniture, packing boxes and crates, tool handles (non impact) and other general utility purposes. When treated, the timber is suitable for fencing and light constructional works.


REFERENCES

  1. Burgess, H. J. 1958. Strength Grouping of Malaysian Timbers. Malayan Forest Service Trade Leaflet No. 25. The Malaysian Timber Industry Board and Forest Research Institute Malaysia, Kuala Lumpur. 15 pp.
  2. Menon, P. K. B. 1986. Uses of Some Malaysian Timbers. Revised by Lim, S.C. Timber Trade Leaflet No. 31. The Malaysian Timber Industry Board and Forest Research Institute Malaysia, Kuala Lumpur. 48 pp.
  3. Wong, T. M. 1982. A Dictionary of Malaysian Timbers. Revised by Lim, S. C. & Chung, R. C. K. Malayan Forest Records No. 30. Forest Research Institute Malaysia, Kuala Lumpur. 201 pp.