Blends of polyoxymethylene (POM) and phenoxy were obtained by melt-blending to determine their phase behavior and to determine, among others, their dynamic and static mechanical properties. The dynamic mechanical spectrum of POM showed an unusually wide peak below the melting temperature that was attributed to amorphous POM close to, and hindered by, the predominant crystalline phase. The T-g of phenoxy was constant with composition, as was probably that of POM, proving their complete immiscibility. The overall mechanical properties of the blends, however, were those of a compatible blend. The synergism in ductility observed in POM-poor blends was partially attributed to their lesser crystalline character.