Abstract: A thermoplastic composition made from or containing (i) a polyolefin portion made from or containing (a) an ethylene/alkyl acrylate, (b) a polyolefin elastomer selected from copolymers of ethylene with a C3-C15 alpha-olefin, and optionally with a diene, having a density of from 0.860 to g/cm3, (c) an ethylene polymer grafted with carboxyl groups or organic silane groups, and optionally (d) a copolymer of ethylene with a C4-C10 alpha-olefin, having a density of from 0.910 to g/cm3, and (ii) a mineral portion made from or containing (e) magnesium hydroxide, wherein the components (a)-(e) being present in amount such that the weight ratio (e)/polyolefin portion ranges from 0.8:1 to 1.75:1, the weight ratio (a)/(b) ranges from 0.75:1 to 1.25:1, and the weight ratio (a)/(e) ranges from 0.15:1 to 0.4:1; and wherein the thermoplastic composition has a melt flow rate of at least 2 g/10 min.