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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1271

Title: Effect of glue type on flexural and tensile properties of finger-jointed tropical African hardwoods
Authors: Ayarkwa, Joshua
Hirashima, Yoshihiko
Sasaki, Yasutoshi
Ando, Kosei
Issue Date: 2000
Publisher: Forest Products Society
Citation: Forest Products Journal, vol. 50, No. 10
Abstract: A study was undertaken to evaluate the flexural and tensile properties of finger joints produced from Obeche (Triplochiton scleroxylon), Makore (Jeghemella heckelii), and Moabi (Baillonella toxisperma) using resorcinol formaldehyde (RF), melamine formaldehyde (MF), and isocyanate (ISO) adhesives. The results of the study have indicated that, generally, glue type has a statistically significant effect on the flexural and tensile strengths of finger joints from the three tropical African hardwoods. No significant effect was, however, observed on modulus of elasticity in both bending and tension. All three glues proved to be nearly equivalent in finger joint bending strength for Obeche, but in tension, ISO glue was significantly superior. MF glue was significantly superior in both bending and tensile strengths for Makore and Moabi. On the basis of joint efficiency and percentage wood failure, RF and ISO glues proved unsatisfactory as a bonding medium in the medium-density Makore and the high-density Moabi. The performance of the three different glues appeared to be related to wood density, exhibiting the highest joint efficiencies in the low-density Obeche, moderate efficiencies in the medium-density Makore, and the lowest efficiencies in the high-density Moabi. MF, however, appeared to perform better in the medium-density Makore than in Obeche. The high-density Moabi resulted in the significantly lowest joint efficiency and percentage wood failure, even with MF glue. MF adhesive is recommended for finger jointing in the medium-density Makore and the high-density Moabi, and ISO adhesive for the low-density Obeche.
Description: This article was published by Forest Products Society in 2000.
URI: http://hdl.handle.net/123456789/1271
Appears in Collections:College of Architecture and Planning

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