Ranggu


INTRODUCTION

The Standard Malaysian Name for the timber of Koordersiodendron pinnatum (Anacardiaceae). The ASEAN Standard Name, which is of Indonesian origin, is MUGIS. Vernacular names applied include ranggu (Sabah and Sarawak), although in Sarawak, ranggu is also applicable to certain species of the family Meliaceae. This species is found in the Malaysian states of Sabah and Sarawak and is absent in the Peninsular. This is a monospecific timber. The sapwood is white to pale pink and is clearly defined from the heartwood, which is pink-brown to red-brown and darkens on exposure.

Also known as Bugis (Indonesia) and Amugis (Philippines).


DENSITY

The timber is moderately hard and moderately heavy to heavy with a density of 690-915 kg/m3 air dry. The timber is classified under Medium Hardwood in Malaysia.


NATURAL DURABILITY

The timber is moderately durable under exposed conditions.


TEXTURE

Texture is rather fine and even, with straight to interlocked grain.


STRENGTH PROPERTIES

The timber falls into Strength Group B (Burgess, 1958) or SG3 (MS 544: Part 2:2001).


MACHINING PROPERTIES

It is reported to be easy to saw and works well with all tools, although there is a slight tendency for grain pick-up on radial surface.


NAILING PROPERTY

The nailing property ranges from good to poor. 


AIR DRYING

The timber is reputed to season slowly, with moderate staining, slight bowing and end-checking as the main sources of degrade. 13 mm thick boards take approximately 5 months to air dry, while 38 mm thick boards take 6 months.


SHRINKAGE

Shrinkage is fairly high, with radial shrinkage averaging 1.7% and tangential shrinkage averaging 2.6%.


USES

The timber is suitable for medium construction, flooring, interior construction, furniture, cabinet making, general joinery, door panels and turneries.


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 Insitute Malaysia, Kuala Lumpur. 48 pp.
  3. MS 544: Part 2: 2001: Code Of Practice For 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 Record No. 30. Forest Research Institute Malaysia, Kuala Lumpur. 201 pp.