Laran

INTRODUCTION

The Standard Malaysian Name for the timber of Neolamarckia cadamba (Rubiaceae). Vernacular names applied include entipong (Sarawak), kelampayan (Peninsular Malaysia and Sarawak), kelempayan (Sabah), limpoh (Sabah) and sempayan (Sarawak). Only one species is of importance in this country. The sapwood is not differentiated from the heartwood, which is white with a yellow tinge and darkens to creamy yellow on exposure.

Also known as Thkoow (Cambodia); Anthocephalus (Fiji); Kadam (India); Emajang, Jabon, Laran and Semama (Indonesia); Koo-somz and Sako (Laos); Maukadon, Mau-lettan-she and Yemau (Myanmar); Kadam (Pakistan); Kaatoan bangkal (Philippines); and Ka Thum, Kra Thum, Krathum-bok and Taku (Thailand).


DENSITY

The timber is soft and light with a density of 290-465 kg/m3 air dry. It is classified under Light Hardwood in Malaysia.


NATURAL DURABILITY

The timber is non-durable.


PRESERVATIVE TREATMENT

It should be fairly easy to treat with preservatives.


TEXTURE

Texture is moderately fine and even, with straight grain.


STRENGTH PROPERTIES

The timber falls into Strength Group D (Burgess, 1958) or SG 7 (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.


AIR DRYING

The timber seasons fairly rapidly with slight end checks, splitting and insect attack as the main sources of degrade. The timber is also moderately prone to sapstaining. 13 mm thick boards take approximately 2.5 months to air dry, while 38 mm thick boards take 3.5 months.


SHRINKAGE

Shrinkage is rather low with radial shrinkage averaging 0.8% and tangential shrinkage averaging 2.1%.


USES

The timber is suitable for the manufacture of plywood, packing boxes and crates, wooden sandals, disposable chopsticks, ladies shoe soles and possibly as a source of short fibre pulp. It is also suitable for dug-outs or canoes and less expensive furniture if properly seasoned.


REFERENCES

  1. Burgess, H. J. 1958. Strength Grouping of Malaysian Timbers. Malayan Forest Service Trade Leaflet No. 25. The MalaysianTimber 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.