Dedaru

INTRODUCTION

The Standard Malaysian Name as well as the ASEAN Standard name for the timber of Cantleya corniculata (Icacinaceae). Vernacular names applied include bedaru (Peninsular Malaysia) and samala (Sabah). This is a monotypic timber. The sapwood is light yellow-brown and is sharply defined from the heartwood, which is yellow-pink-brown.

Also known as Samala (Brunei); and Bedaru, Garu buaya, Mendaru and Seranai (Indonesia).


DENSITY

The timber is hard and very heavy with a density of 1,105-1,140 kg/m3 air dry.


NATURAL DURABILITY

The timber is moderately durable.


TEXTURE

Texture is fine and even, with interlocked grain.


STRENGTH PROPERTIES

The timber falls into Strength Group A (Burgess, 1958) or SG 2 (MS 544:Part 2:2001).


MACHINING PROPERTIES

It is moderately easy to slightly difficult to resaw and moderately easy to cross-cut. Planing is easy and the planed surface is smooth.


NAILING PROPERTY

Nailing property is rated as poor.


AIR DRYING

The timber seasons moderately slowly, with only slight surface-checking, insect and fungal attacks as the main sources of degrade. 13 mm thick boards take 2.5 months to air dry, while 38 mm thick boards take 6 months.


SHRINKAGE

Shrinkage is average, with radial shrinkage averaging 1.3% and tangential shrinkage averaging 1.9%.


USES

It is a very good timber for medium and heavy construction, heavy duty furniture, laboratory benches, posts, beams, joists, rafters, marine construction, flooring (heavy traffic), decking, railway sleepers, heavy duty columns, heavy duty and permanent types of pallets as well as ornamental items. It is the favourite timber for making tops.


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. MS 544:Part2:2001. Code of Practice for the Structural Use of Timber: Permissible Stress Design of Solid Timber.
  4. 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.