PEER-REVIEWED ARTICLE bioresources.com Sumardi et al. (2018). “Strand boards materials,” BioResources 13(4), 8385-8393. 8385 Alternative Materials for Strandboards Made with Waste Veneer from Industrial Plywood In Indonesia Ihak Sumardi, a, * Rudi Dungani, a Yoyo Suhaya, a Alfi Rumidatul, a and Muhammad Navis Rofii b The objective of this study was to investigate the physical and mechanical properties of strandboard made from the residual veneer material of rubber wood (Hevea brasiliensis Müll. Arg.) and falcata wood (Falcataria moluccana). The study investigated five different ratios of rubber and falcata (100:0; 75:25; 50:50; 25:75; 0:100). Random strandboards were made at a target density of 600 kg m -3 using phenol formaldehyde (PF) as resin. All panels were tested through static bending (MOE/MOR). The internal bonding, thickness swelling, and water absorption of the strandboards were also examined. Results showed that the incorporation of the rubber and falcata ratio of 25:75 was substantially greater than the other ratios. The samples using other ratios for MOR, MOE, and physical properties obtained slightly lower mean values compared to the sample with the ratio of 25:75 (rubber and falcata). Based on these results, strandboards obtained from rubber and falcata have the potential to be commercialized. Keywords: Strandboard; Veneer waste; Rubber wood; Falcata wood; Plywood industry Contac information: a: School Life Sciences and Technology-Bandung Institute of Technology, Jalan Ganesha 10 Bandung, Indonesia; b: Faculty of Forestry, Universitas Gadjah Mada, Jalan Agro 1, Bulaksumur, Yogyakarta 55281, Indonesia; *Coresponding author: ihak@sith.itb.ac.id INTRODUCTION Numerous studies have been performed to develop alternative material to replace wood strands with oriented strandboard (OSB). Falcata (Falcataria moluccana) and rubber wood (Hevea brasiliensis Müll. Arg) are possibly ideal sources for strand-based phenol- formaldehyde resin (Oh and Kim 2015). These are fast-growing plants and widely considered as the most important species to have been planted in Indonesia. However, the application of these species is mostly limited to fuel wood and traditional uses such as chair manufacturing. To develop higher value applications of fast-growing trees, plywood products have been produced in some industries in Indonesia. However, the efficiency of raw materials is very low, ranging from 30% to 35%. Waste production from the plywood industry is very high; so far, the waste from the plywood industries that used fast-growing timber species has ranged from 65% to 70%. The rest of the waste has included core logs, round up, and veneer. Wasted veneer, which reached 7 million m 3 /year (Ministry of Forestry, Republic of Indonesia 2014), has the potential to be utilized as a composite product. One type of composite product that can be made is OSB. Strandboard is a kind of substitute for plywood panels for interior and exterior uses as sheathing, flooring, and I-joist material. Spelter et al. (1997) found that the cost of wood fibers has more than doubled in the past 20 years. They observed that production growth and decreasing quality wood supply have spurred the development of alternative materials to replace wood fibers for OSB