A composition formed from (a) a polyester and polycarbonate blend; (b) an organopolysiloxane-polycarbonate block copolymer; (c) an acrylic core shell impact modifier; (d) titanium dioxide and (e) a flame retarding amount of a halogenated flame retardant has properties useful as a weatherable molding composition. It can suitably be used in articles such as encloses for electronic equipment such as communication devices.