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Assessment of the compression strength performance of finger-jointed wood products

Author Affiliations

  • 1Research Division, State Timber Corporation, Sri Lanka
  • 2Dept. of Civil and Environmental Engineering, Faculty of Engineering, University of Ruhuna, Hapugala, Galle, Sri Lanka
  • 3Dept. of Agric. Engineering, Faculty of Agriculture, University of Ruhuna, Mapalana, Kamburupitiya, Sri Lanka
  • 4Dept. of Crop Science, Faculty of Agriculture, University of Ruhuna, Mapalana, Kamburupitiya, Sri Lanka

Res. J. Engineering Sci., Volume 10, Issue (1), Pages 12-19, January,26 (2021)


Finger joint technique is used to eliminate wood defects which weaken the strength of sawn wood plank. The variation of compression strength of seven wood species commonly used for manufacturing furniture in Sri Lanka was investigated to assess finger joint efficiencies of wood species. Stratified random sampling was applied to measure compression tests in un-jointed and finger- jointed samples. BS 373: 1957 was used as the standard for test conducted with one Softwood species Pine (Pinus caribaea) and Hardwood species; Grandis (Eucalyptus grandis), Jack (Aartocarpus heterphyllus), Kumbuk (Terminelia arjuna), Big leaf Mahogany (Swietenia macrophylla), Satin (Chloroxylon swietenia) and Teak (Tectona grandis). Two finger lengths (13mm and 19 mm) were used and tested by Universal Testing Machine, using polyvinyl acetate adhesive. Data were analyzed by using ANOVA and Duncan\'s Multiple Range Test at 0.05 significant level. It was observed that the highest joint efficiency was recorded in 19 mm finger -jointed specimen of Grandis followed by 13mm finger jointed Pine specimen for compression parallel to grain. The least joint efficiency was recorded in 13mm finger jointed specimen of Kumbuk. Strength of compression perpendicular to grain of 19 mm finger-jointed specimens showed better performance than clear specimens, except Jack and Teak. Limited availability of historical data was a constraint during the study and Sri Lankan context, little effort has so far made on finger jointed manufacturing. The results will be utilized in the commercial application of finger joint manufacturing industry and useful to the traders and planners of timber industry.


  1. Muthumala, C.K., De Siva S., Arunakumara, K.K.I.U. and Alwis, PLAG. (2020)., Identification of joint efficiencies in 13 mm finger jointed timber species used in Sri Lanka., ICSBE 2018. LNCE 44 Springer nature. pte, ltd. Singapore.p. 261-267.
  2. Bernard, E. (2014)., Maximizing wood residue utilization and reducing its production rate to combat climate change., International Journal of Plant and Forestry Science, 1(2), 1-12.
  3. Ofosu, A., Nutakor, J.M.N. and Ayarkwa, J. (1996)., Kumasi base-line survey- data collection for a finger jointing plant., Forestry Res. Inst. of Ghana, Kumasi, Ghana.
  4. BS EN, 15497. (2004)., Structural finger jointed solid timber-Performance requirements and minimum production requirements., British Standards Institution.
  5. Sandika, A.L., Pathirana, G.D.P.S. and Muthumala, C.K. (2017)., Finger joint timber products for effective utilization of natural resources: An analysis of physical properties, Economic factors and Consumers perception., International Symposium on Agriculture and Environment, University of Ruhuna, Sri Lanka. P.109-111
  6. Abeysinghe, L.S., Pathirana,S. and Muthumala, C. K. (2016)., Economic factors and physical properties of finger joint timber product to promote effective utilization of natural resources., Proceeding of the International Forestry and Environment symposium, USJP, Sri Lanka. p.60.
  7. Jokerst, R.W. (1981)., Finger-jointed wood products., Res. Pap FPL-382 USDA Forest Service, Madison: Forest Pro Lab; Wis.p. 25.
  8. Winandy, J.E. (1994)., Effects of long-term elevated temperature on CCA-treated Southern Pine lumber., Forest Products Journal, 44(6), 49-55.
  9. Yeomans, D. (2003)., Strength Grading Historic Timbers., Cathedral Communications Limited 2010. Retrieved from /grading accessed 10 May 2020.
  10. Sellers, T., J. Mcsween, J. R., Nearn, W. T. (1988)., Gluing of Eastern Hardwoods: A Review., USDA Forest Service. Southern Forest Experiment Station. GTR SO-71.
  11. Muthumala, C.K., Dulanjalee, M.W.T.C, De Siva, S, Alwis, P.L.A.G. And Arunakumara, K.K.I.U. (2018)., Factors affecting the glue strength of finger joints in commonly used timber species in Sri Lanka., International Symposium on Agriculture and Environment, University of Ruhuna, Sri Lanka. 126-128.
  12. Ayhan, O. and Fatih, Y. (2007)., Structural performance of the finger-jointed strength of some wood species with different joint configurations., Construction and Building Materials. Elsevier Ltd.
  13. Muthumala, C.K., De Siva S., Arunakumara, K.K.I.U. and Alwis, P.L.A.G. (2019)., Finger jointed wood products: A new platform for sustainable use of timber., ATBC-Asia Pacific Conference, Mas Athina, Sri Lanka. 215.
  14. Muthumala, C.K., De Siva S., Arunakumara, K.K.I.U. and Alwis, P.L.A.G. (2019)., Variation of Density, Flexural strength and Anatomical features of finger jointed wood products in Sri Lanka., ICWSE. Romania. 635-642.
  15. Bustos, C, Beauregard, R, Mohammad, M, Hernandez, R.E. (2003)., Structural performance of finger-joined black spruce wood lumber, with different joint configurations., For Prod J., 53(9) 72-76.
  16. Muthumala, C.K., De Siva S., Arunakumara, K.K.I.U. and Alwis, P.L.A.G. (2019)., Identifying the strength grade for finger jointed timber species according to BS 5268-2:2002., Journal of Tropical Forestry and Environment, 9(2), 55-64.
  17. Pedilite Producer firm (2018)., Pidilite Industries ltd, Data sheet., Mumbai, India.
  18. BS EN, 373:1957 (1999)., Methods of testing small clear specimens of timber., British Standards Institution, BSI 07.
  19. Castro, G. and Paganini, F. (1997)., Parameters affecting end finger joint performance in Poplar wood., International conference of IUFRO. S5.02 Timber Engineering. Copenhagen, Denmark.
  20. Vievek, S., De Silva,S., De Silva, S. and Muthumala, C.K. (2016)., Finger joint and their structural performance in different exposure conditions., International Conference on Sustainable Build Environment, Kandy, Sri Lanka. 16-18.
  21. Kishan V.S. K., Sharma, C.M. and Gupta, S. (2015)., Compression and flexural properties of finger jointed mango wood sections Maderas., Ciencia tecnologia, 17(1).