Dedali


INTRODUCTION

The Standard Malaysian Name as well as the ASEAN Standard name for the timber of Strombosia javanica (Olacaceae). Vernacular names applied include bayam badak (Kedah, Perak and Pahang) and belian landak (Sarawak). This is a monotypic timber. The sapwood is lighter in colour than the heartwood and is moderately sharply defined from the heartwood, which is pale yellow with an olive-brown tinge, darkening to light orange-brown.

Also known as Entelung and Kayu Kacang (Indonesia); and Banata (Myanmar).


DENSITY

The timber is soft to moderately hard and moderately heavy. It has been classified under Light Hardwood with a density of 580-720 kg/m3 air dry.


NATURAL DURABILITY

The timber is moderately durable.


TEXTURE

Texture is fine and even with straight or interlocked grain.


STRENGTH PROPERTIES

The timber falls into Strength Group B (Burgess, 1958) or SG 4 (MS 544:Part 2:2001).  


MACHINING PROPERTIES

It is easy to resaw and cross-cut. Planing is easy and the planed surface produced is smooth on the tangential side and slightly rough due to grain pick-up on the radial side.


NAILING PROPERTY

Nailing property is rated as good.


AIR DRYING

The timber seasons very slowly with moderate amount of cupping, twisting, end-checking and surface-checking as the main sources of degrade. The timber is very prone to insect attack during drying. 13 mm thick boards take 7 months to air dry, while 38 mm thick boards take 12 months.


SHRINKAGE

Shrinkage is high, with radial shrinkage averaging 1.4% and tangential shrinkage averaging 3.5%.


USES

The timber is suitable for general utility purposes, medium construction under cover, posts, beams, joists, rafters, railway sleepers, packing boxes and crates, joinery, cabinet-making, plywood, interior finishing, panelling, mouldings, partitioning, staircase (angle blocks, rough brackets, apron lining and balustrades), pallets for both expendable and permanent types (light duty) and furniture. In Indonesia, it has been successfully used in the manufacture of bent works like badminton rackets.


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:Part 2:2001. 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.