The fibres described in the literature for this intention are cellulose micro-fibres 121 l.natural fibres 1221 and commercial regenerated cellulose fibres [19]. Unlike biodegradable polyester, when natural fibres are mixed with themoplastic starch, their mechanical properties improved significantly, the chemical similarities of starch and of plant fibres providegood compatibility. A significant improvement in water resistance is obtained by adding commercial cellulose fibres [191 or micro-fibre 1231. behavior This related to the high crystalline 'hydrophobic character of the cellulose fibres in comparison to starch hydrophilic property. In addition, these authors [211 demonstrated an improved thermal stability due to a higher and longer thermal resistance of cellulose fibres.