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Forests, Volume 17, Issue 6 (June 2026) – 2 articles

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21 pages, 3233 KB  
Article
Development of OSB Panels with Wood Residues from the Northern Region of Brazil
by Isabella Imakawa Araújo, Clara Gaspar Fossi de Souza, Tiago Hendrigo Almeida, André Luis Christoforo and Francisco Antonio Rocco Lahr
Forests 2026, 17(6), 631; https://doi.org/10.3390/f17060631 (registering DOI) - 22 May 2026
Abstract
Wood-based panels such as oriented strand board (OSB) have gained increasing relevance in sustainable construction due to their favorable mechanical performance and efficient use of raw materials. This study evaluates the physical and mechanical properties of OSB panels manufactured from residues of five [...] Read more.
Wood-based panels such as oriented strand board (OSB) have gained increasing relevance in sustainable construction due to their favorable mechanical performance and efficient use of raw materials. This study evaluates the physical and mechanical properties of OSB panels manufactured from residues of five Brazilian tropical species, namely Cambará (Erisma sp.), Caixeta (Simarouba sp.), Cedroarana (Cedrelinga catenaeformis), Tatajuba (Bagassa guianensis), and Tauari (Couratari oblongifolia) bonded with castor oil-based polyurethane resin (12% by dry weight; 3-layer ratio 20:60:20). Seven formulations were tested (five monospecies; two mixed species) and characterized in accordance with EN 300, EN 310, EN 317, EN 319, EN 322, EN 323, ABNT NBR 14810-2, and ASTM D2719. Panel densities ranged from 0.685 to 0.813 g/cm3. Cedroarana and Caixeta panels achieved the highest mechanical performance: MOR of 44.04 MPa and 40.96 MPa, and MOE of 6741 MPa and 6287 MPa, respectively (parallel direction), both exceeding EN 300 OSB/4 thresholds. All panels met internal bond requirements (≥0.5 MPa). Compaction ratio emerged as the primary determinant of mechanical behavior. Mixed species panels performed comparably to monospecies configurations, confirming the viability of residue valorization without species segregation. The castor oil-based resin provided adequate bonding and moisture resistance, supporting its use as a formaldehyde free renewable alternative for structural-grade OSB. Full article
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32 pages, 16019 KB  
Review
Advances in Fire Retardant Technologies for Bamboo-Based Materials
by Yu Zhu, Zhaoyan Cui, Yujie Huang, Ernian Zhao and Ming Xu
Forests 2026, 17(6), 630; https://doi.org/10.3390/f17060630 (registering DOI) - 22 May 2026
Abstract
Bamboo, as a rapidly renewable and sustainable material, has gained increasing attention in the construction, furniture, automotive interiors, and packaging industries due to its excellent mechanical properties, light weight, and environmental friendliness. However, the inherent flammability of bamboo, characterized by its porous structure [...] Read more.
Bamboo, as a rapidly renewable and sustainable material, has gained increasing attention in the construction, furniture, automotive interiors, and packaging industries due to its excellent mechanical properties, light weight, and environmental friendliness. However, the inherent flammability of bamboo, characterized by its porous structure and high hemicellulose content, poses a significant fire hazard that severely limits its wide application. This review systematically synthesizes recent advances in the fire performance and flame-retardant modification of bamboo-based materials. First, the thermal degradation behavior and combustion mechanisms of bamboo are discussed in relation to its primary chemical constituents, including cellulose, hemicellulose, and lignin. Subsequently, various flame-retardant strategies are reviewed, including inorganic flame retardants, phosphorus–nitrogen systems, nanomaterial-based additives, and bio-based flame-retardant approaches. The effectiveness of different modification techniques, such as impregnation treatment, adhesive modification, and surface coating, is also analyzed. Future research directions are proposed, emphasizing the development of environmentally friendly flame-retardant systems, multifunctional modification strategies, and the design of high-performance flame-retardant bamboo-based materials. This review aims to provide a comprehensive framework for advancing the fire safety design and sustainable application of bamboo-based materials. Full article
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