 The scientific community aims to produce sustainable materials by replacing non-renewable raw materials with alternatives, and we found that 25% eucalyptus grandes times eucalyptus urophila fiber reinforcement in unsaturate orthophallic polyester resin composites has the best properties. This article was authored by Tamiya's Galvaro Tavares Pereira, Juliana Farinasi-Mendez, Juliano Elvis Oliveira, and others.