Assessment of physical and mechanical properties of papua new guinea timber species

  • Benoit Belleville
  • Kilva Lancelot
  • Elaine Galore
  • Barbara Ozarska
Keywords: Compression strength, flexural bending strength, hardness, plantations, regrowth forests, shear, stiffness


A comprehensive testing program has been developed to assess different physical and mechanical properties of 26 commercial and lesser-known PNG species from secondary and plantation forests. The impact of log position in a tree on the mechanical properties has also been assessed to optimize the utilization of timbers along the value chain. The results showed that stiffness and bending strength tend to decrease or remain unchanged along the stem. Shear strength and Janka hardness displayed a similar trend to a lesser extent where the position in the tree had a limited impact on compression strength properties. Thus, segregating based on log position can be of interest where desired mechanical properties and costs associated with segregating justify optimum mechanical properties for the intended end use. The properties of selected species from plantations and regrowth forests were generally lower than those found in the literature for timbers from old-growth forests. The size of specimens tested, the amount and provenance of tested material, and some adaptive traits for tropical tree species are some factors potentially explaining observed differences. However, a comparison with recent studies tends to confirm the overall reduction of physical and mechanical properties when compared with old-growth forests timbers.


ASTM. 2009. Standard test methods for small clear specimens of timber. ASTM D143, ASTM International, United States.

ASTM. 2010. Standard Practice for Sampling Forest Trees for Determination of Clear Wood Properties. ASTM D5536. ASTM International, United States.

Baar, J.; Tippner, J.; Rademacher, P. 2015. Prediction of mechanical properties – Modulus of rupture and modulus of elasticity – of five tropical species by non-destructive methods. Maderas-Cienc Tecnol 17(2):239-252.

Barrett, J. D.; Kellogg, R. M. 1991. Bending strength and stiffness of second-growth Douglas-fir dimension lumber. Forest Prod J 41 (10): 35-43.

Bendtsen, B.A. 1978. Properties of wood from improved and intensively managed trees. Forest Prod J 28(10):61-72.

Bolza, E.; Kloot, N.H. 1976. The mechanical properties of 81 New Guinea timbers. Technical Paper No. 11, Division of Building Research, CSIRO, Melbourne, Australia.

Bootle, K.R. 2005. Wood in Australia. 2nd Edition. McGraw-Hill.

Cabrolier, P.; Beauchene, J.; Thibaut, B. 2009. Is interlocked grain an adaptive trait for tropical tree species in rainforest? 6th Plant Biomechanics Conference – Cayenne, Nov 16-21. Pp.279-284.

Edwin, P.; Ozarska, B. 2015. Bending properties of hardwood timbers from secondary forest in Papua New Guinea. Journal of Tropical Forest Science 27(4): 456–461.

FAO. 2015. Global Forest Resources Assessment 2015. Food and Agriculture Organization of the United Nations. Rome, Italy. 253 p. ISBN 978-92-5-108826-5.

Kelin, Y.; Xiaomei, J.; Jianxiong, L. 2006. Guide on utilization of eucalyptus and acacia plantations in China for solid wood products. Research Institute of Wood Industry. Chinese Academy of Forestry. Technical Report. ITTO Project PD 69/01 Rev.2(I). 195 p.

Kotlarewski, N.J.; Belleville, B.; Gusamo, B.K.; Ozarska, B. 2015. Mechanical properties of Papua New Guinea balsa wood. European Journal of Wood and Wood Products 74:83-89.

Harvald, C. 1988. Technical properties of conifer trees (in Danish). Report. Skovbrusinstitutet. Den KGL. Veterirner- og Landboh0jskole. K0benhavn.

Haslett, A.N.; Young, G.D.; Britton, R.A.J. 1991. Plantation grown tropical timbers. 2. Properties, processing and uses. Journal of Tropical Forest Science 3(3):229-237.

Hojbo, 0. A. 1991. The quality of wood of Norway spruce (Picea abies) planted with different spacing. Ph.D. Thesis, Agricultural University of Norway, Norway.

Hung, T.D.; Brawner, J.T.; Meder, R.; Lee, D.J.; Southerton, S.; Thinh, H.H.; Dieters, M.J. 2015. Estimates of genetic parameters for growth and wood properties in Eucalyptus pellita F. Muell. to support tree breeding in Vietnam. Annals of Forest Science 72:205-217.

Kliger, I.R.; Perstorper, M.; Johansson, G.; Pellicane P.J. 1995. Quality of timber products from Norway spruce - Part 3. Influence of spatial position and growth characteristics on bending stiffness and strength. Wood Sci Technol 29: 397-410.

Leksono, B.; Kurinobu, S.; Ide, Y. 2008. Realized genetic gains observed in second generation seedling seed orchards of Eucalyptus pellita in Indonesia. J For Res 13:110-116.

Madsen, B. 1990. Length effect in 38 mm spruce-pine-fir dimension lumber. Can J Civ Eng 17: 226-242.

Machado, J.; Cruz, H. 2005. Within stem variation of maritime pine timber mechanical properties. Holz Roh Werkst 63(2): 154-159.

Pearson, R. G.; Gilmore, R. C. 1980. Effects of fast growth rate on the mechanical properties of Loblolly pine. Forest Prod J 30(5): 60-66.

PNGFA. 2007. Overview of PNG’s Forests. Papua New Guinea Forest Authority. [Accessed 3 February 2017].

Shivnaraine, C. S. 1989. Within stem variation in bending strength and stiffness of lumber from plantation grown white spruce. M.Sc. Thesis, University of New Brunswick, Fredericton, Canada.
How to Cite
Belleville, B., Lancelot, K., Galore, E., & Ozarska, B. (2019). Assessment of physical and mechanical properties of papua new guinea timber species. Maderas. Ciencia Y Tecnología, 22(1). Retrieved from