Basic and Grade Stress for Some Timber in Sarawak

  • Gaddafi Ismaili
  • Badorul Hisham Abu Bakar
  • Khairul Khuzaimah Abdul Rahim


Strength properties’ tests are conducted in the small clear sample. This paper aim to acquire the basic and grade stresses of some fast growing species thus identifies its strength group. Thus, the information of wood properties from different species and condition are acquired from strength property's test. The required information namely, bending parallel to the grain, compression stress parallel to grain, shear parallel to grain and modulus of elasticity. The condition of the trees which is referred to green and air-dry condition. Three different species which are referred to exotic species of Acacia mangium and indigenous species of Aras. The results from the study indicated that, Acacia mangium classified under the strength group SG5, whilst Aras was classified under the strength group SG7. The timber is of medium density Light Hardwood ranging from 0.37-0.52g/cm3 air-dry condition.


British Standard (1957). Methods of Testing Small Clear Specimen of Timber. British Standard Institution. BS 373: 1957. 31pp.

British Standard Code of Practice CP 112:1967. British Standards Institute, London.

Engku Abdul Rahman Bin Chik (1978). Basic and Grade Stresses for Strength Groups of Malaysian Timbers, Malaysian Forest Service Trade Leaflet No. 38, Kuala Lumpur, Malaysia.

Engku Abdul Rahman Bin Chik (1988). Basic and Grade Stresses for some Malaysian Timbers, Timber Trade Leaflet No. 37, Kuala Lumpur, Malaysia.

Malaysian Standard (2001). Malaysian Standard MS544: Part 2. Code of Practice on Structural use of timber (First revision). Department of Standards Malaysia.

Thomas, A.V. (1948). Allowable Working stresses for Malayan Timbers Trade Leaflet No.7. Forest Department, Kuala Lumpur.

How to Cite
Ismaili, G., Abu Bakar, B. H., & Abdul Rahim, K. K. (2011). Basic and Grade Stress for Some Timber in Sarawak. Journal of Civil Engineering, Science and Technology, 2(2), 35-38.