The fast-growing plantation radiata pine wood has undesirable intrinsic properties, which cannot meet the physical and mechanical performance requirements of string instrument fretboard materials. In this study, the synergistic modification technology of FA impregnation treatment and densification treatment was proposed to improve the density, dimensional stability, and mechanical properties. In addition, its surface color of radiata pine wood was deepened to imitate precious tropical hardwood (e.g., ebony, Indian rosewood, and African blackwood) that are commonly used in the fretboards of string instruments. This technology combined the characteristics of the wood densification and FA impregnation treatment, that is, the densification treatment can improve the mechanical strength of low-quality wood and FA can fix the deformation of the densified wood, preventing treated wood from spring back. The performance differences between the fretboard wood and FA-densified-wood with compression rates (CRs) of 17 %, 33 %, and 50 % were analyzed, and the optimal CR was determined. The fretboard wood has high density (> 800 kg/m³), dimensionally stable, and red brown or jet-black surface color. The modulus of rupture (MOR), modulus of elasticity (MOE), compression strength (CS), Brinell hardness (BH), and impact bending strength (IBS) of the fretboard wood are higher than 140.0 MPa, 13.0 GPa, 120 MPa, 7.9 N/m², and 17 kJ/m², respectively. The fretboard wood also has good abrasion resistance. The FA-modified wood with a CR of 50 % had a high density (> 1000 kg/m³), superior dimensional stability, excellent mechanical properties, and its surface color was jet black, which was the same as those of the fretboard wood. The FA-modified wood with a CR of 50 % met the performance requirements of wood for fretboards, and has the potential to replace the fretboard wood for string instrument fretboard manufacturing. It breaks through the restriction that fast-growing plantation wood cannot be used for musical instruments, alleviating the shortage of the resources of commonly used tropical hardwood for fretboards and providing new insights for the high-value utilization of plantation radiata pine wood.

速生人工林辐射松木材内在特性不理想，不能满足弦乐器指板材料的物理力学性能要求。本研究提出了FA浸渍处理和致密化处理的协同改性技术，以提高密度、尺寸稳定性和力学性能。此外，它加深了辐射松木材的表面颜色，以模仿通常用于弦乐器指板的珍贵热带硬木（例如乌木、印度红木和非洲黑木）。该技术结合了木材致密化和FA浸渍处理的特点，即 致密化处理可以提高劣质木材的机械强度，FA可以固定致密化木材的变形，防止处理后的木材回弹。分析了压缩率 (CR) 为 17%、33% 和 50% 的指板木材和 FA 致密木材之间的性能差异，并确定了最佳 CR。指板木材密度高（> 800 kg/m³ )、尺寸稳定，表面呈红棕色或墨黑色。指板木材的断裂模量（MOR）、弹性模量（MOE）、压缩强度（CS）、布氏硬度（BH）、冲击弯曲强度（IBS）均高于140.0 MPa、13.0 GPa、120 MPa，分别为 7.9 N/m ²和 17 kJ/m ²。指板木材还具有良好的耐磨性。CR 为 50% 的 FA 改性木材具有高密度 (> 1000 kg/m ³)，尺寸稳定性好，机械性能优良，表面颜色为墨黑色，与指板木材相同。CR 为 50% 的 FA 改性木材满足了指板木材的性能要求，并有可能取代指板木材用于弦乐器指板制造。突破了速生人工林木不能用于乐器的限制，缓解了常用热带硬木指板资源短缺的问题，为人工林辐射松木材的高价值利用提供了新思路。