A composition comprising, based on the total weight of the composition: 55.5 to 90 weight percent of a first poly(phenylene ether); 3 to 17 weight percent of a poly(phenylene ether)-polysiloxane block copolymer reaction product comprising a second poly(phenylene ether), and a poly(phenylene ether)-polysiloxane block copolymer comprising a poly(phenylene ether) block, and a polysiloxane block comprising, on average, 20 to 80 siloxane repeat units; wherein the poly(phenylene ether)-polysiloxane block copolymer reaction product comprises 1 to 30 weight percent siloxane repeat units and 70 to 99 weight percent phenylene ether repeat units, based on the total weight of the poly(phenylene ether)-polysiloxane block copolymer reaction product; 3 to 10 weight percent of a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene; 4 to 13 weight percent of an organophosphate flame retardant; 0 to 2 weight percent of a reinforcing filler; 0 to 1 weight percent of an adhesion promoter selected from the group consisting of (a) phenolic compounds having a molecular weight of 94 to 18,000 g/mol, measured as defined in the specification; (b) hydroxysilyl-terminated polydiorganosiloxanes of the formula wherein m is 2 to 50, and each occurrence of R 10 is independently C 1 -C 12 hydrocarbyl, provided that 5 to 60 mole percent of the occurrences of R 10 are independently C 6 -C 12 aryl; and (c) combinations of the (a) phenolic compounds and the (b) hydroxysilyl-terminated polydiorganosiloxanes; and 0 to 0.5 weight percent of an addition polymer comprising repeat units derived from a glycidyl ester of an α,β-ethylenically unsaturated acid. 55.5 to 90 weight percent of a first poly(phenylene ether); 3 to 17 weight percent of a poly(phenylene ether)-polysiloxane block copolymer reaction product comprising a second poly(phenylene ether), and a poly(phenylene ether)-polysiloxane block copolymer comprising a poly(phenylene ether) block, and a polysiloxane block comprising, on average, 20 to 80 siloxane repeat units; wherein the poly(phenylene ether)-polysiloxane block copolymer reaction product comprises 1 to 30 weight percent siloxane repeat units and 70 to 99 weight percent phenylene ether repeat units, based on the total weight of the poly(phenylene ether)-polysiloxane block copolymer reaction product; a second poly(phenylene ether), and a poly(phenylene ether)-polysiloxane block copolymer comprising a poly(phenylene ether) block, and a polysiloxane block comprising, on average, 20 to 80 siloxane repeat units; a poly(phenylene ether) block, and a polysiloxane block comprising, on average, 20 to 80 siloxane repeat units; 3 to 10 weight percent of a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene; 4 to 13 weight percent of an organophosphate flame retardant; 0 to 2 weight percent of a reinforcing filler; 0 to 1 weight percent of an adhesion promoter selected from the group consisting of (a) phenolic compounds having a molecular weight of 94 to 18,000 g/mol, measured as defined in the specification; (b) hydroxysilyl-terminated polydiorganosiloxanes of the formula wherein m is 2 to 50, and each occurrence of R 10 is independently C 1 -C 12 hydrocarbyl, provided that 5 to 60 mole percent of the occurrences of R 10 are independently C 6 -C 12 aryl; and (c) combinations of the (a) phenolic compounds and the (b) hydroxysilyl-terminated polydiorganosiloxanes; and 0 to 0.5 weight percent of an addition polymer comprising repeat units derived from a glycidyl ester of an α,β-ethylenically unsaturated acid.