This research focuses on seaweed-derived biopolymers, specifically sodium alginate, which promise to be a sustainable alternative to conventional plastics due to its widespread availability and organic nature. The alginate is extracted from natural seaweed with a yield of 27% by the solution casting method. This project specifically explores the use of composite formulations to enhance alginate properties through additives such as glycerol and silica. Glycerol, tested at different concentrations (15, 25, 50 wt.%), works as a plasticizer and enhances the flexibility of alginate films. Silica, as a second additive tested at low concentrations (1-3 wt.%), can improve the strength and thermal stability of the material. The goal is to determine the effect of different formulations on the thermal and mechanical properties of my films. The overall objective of this project is to produce good alternatives in food packaging to improve human life and the natural environment.