Compositions comprising: A) a crystalline isotactic propylene homopolymer having a flex modulus of greater than 1930 MPa and an HDT of greater than 100° C.; B) an ethylene/α-olefin interpolymer having Tg of less than −30° C., a tan delta measured at 0.1 radians/s at 190° C. of less than 2, an HDT that is greater than, or equal to, the peak melting temperature of the ethylene/α-olefin interpolymer, measured by differential scanning calorimetry, and C) a platy filler, and D) a nitrogen source and a phosphorus source, where at least one source is derived from at least one organic compound, or salt thereof, and wherein the weight ratio of homopolymerπinterpolymer (A:B) is between 9:1 and 6:4. The invention provides other compositions, articles formed from compositions, and methods of making the same.