The study and development of packaging based on biodegradable materials has attracted increasing attention in the search for solving environmental problems caused by the improper disposal and prolonged time to degradation of the packaging based on synthetic polymers. Starch foams have been studied as a replacement for polystyrene containers. However, the starch-based materials have some drawbacks such as low as moisture resistance, and mechanical properties different, such as low as tensile strength. The starch may be processed into foams by extrusion or thermal expansion. On this work, cassava starch foams produced by the process of thermal expansion, with Eucalyptus globulus microcellulose and chitin. The microcellulose was added at levels of 0% and 1%, and chitosan (1%) was used in solution of 1% acetic acid. Glycerol was added as a plasticizer. In the process a suspension containing cassava starch, chitosan and microcellulose was placed in a mold inserted into a heated press term at 170° C, pressure of 2 t, for 3 min. The amount of starch suspension required for complete formation of the foam was 10 g. The foams were analyzed for: thickness, density and water absorption capacity at different times (1, 10, 30 and 60 minutes). The samples containing 1% of microcellulose is presented (p<0.05) more thickness value (2.12 mm) than foams without microcellulose (2.07 mm). Regarding the density, there was no difference (p<0.05) between samples. The average value was 0.26 g.cm-3 for the density for the samples. The analysis of absorption capacity of water showed that after 1 minute of immersion in water, the foams containing 1% of microcellulose absorbed 15.68% less water than the samples without microcellulose. However, there was no significant difference in the water capacities absorption for the samples following 60 min of immersion. Keywords: cassava starch, foams, thermal expansion.