 surface treatment of fan-palm fibers with sodium hydroxide, silane, or a combined treatment improved their tensile strength and interfacial shear strength in unsaturate polyester, FPF samples by removing hemicellulose and lignin components. The alkaline treatment resulted in the highest tensile strength of 816 MPa and the highest IFSS of 4.1 MPa. This article was authored by Hendry Hestiawan, Jamashree and Kuzmino.