The model of Oort and van de Hulst (1946) was the first to consider that grains must evolve in interstellar space by treating both growth and destruction in clouds. The chemical properties had already been derived by van de Hulst (1946) and then later described as the dirty ice model which consisted of the saturated molecules H 2 O, CH 4 and NH. However, as the observed interstellar polarization requires that the interstellar grains must be non-spherical, in this present paper we study the extinction properties and linear polarization of composite spheroidal grains with three axial ratios (i.e. 1.33, 1.5 and 2.0), corresponding to the grain models with the number of dipoles N= 9640, 25.
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