Ngilas

INTRODUCTION

The Standard Malaysian Name, which is of Sarawakian origin, for the timber of Parastemon spp. (Chrysobalanaceae). The ASEAN Standard Name for the timber, which is of Indonesian origin, is MALAS. Vernacular names applied include mendailas (Sabah) and nyalas (Peninsular Malaysia). Major species include P. grandifructus and P. urophyllus. The sapwood is light purple-brown when fresh, becoming grey-brown to light red-brown on exposure and is not sharply differentiated from the heartwood, which is purple–brown when fresh, becoming brown with a light purple or red tinge when dry.

Also known as Malas (Indonesia).


DENSITY

The timber is very hard and very heavy with a density of 915-1,105 kg/m3 air dry.


NATURAL DURABILITY

The timber is moderately durable.


TEXTURE

Texture is moderately fine and even, with straight or slightly interlocked grain.


STRENGTH PROPERTIES

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


MACHINING PROPERTIES

It is very difficult to resaw and cross-cut and is generally slightly difficult to work and plane. The surface produced, however, is smooth.


NAILING PROPERTY

The nailing property is rated as very poor.

  
AIR DRYING

The timber seasons fairly rapidly with slight cupping, bowing, splitting and a moderate amount of end-checking as the main sources of degrade. 13 mm thick boards take 2 months to air dry, while 38 mm thick boards take 4 months.


SHRINKAGE

Shrinkage is very high especially in the tangential direction. Radial shrinkage averages 2.7%, while tangential shrinkage averages 4.8%.


USES

The timber is suitable for medium to heavy construction if protected. Other uses may include flooring (heavy traffic), laboratory benches and fence posts.


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. 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.