Thermoplastic compositions, methods of their manufacture, and articles thereof

A thermoplastic composition comprising, based on the total weight of the polymers in the thermoplastic composition,

• a polycarbonatesiloxane-arylate;
• 2 to 15 wt % of a core-shell impact modifier;
• a flame retardant comprising a bromine-containing polymer or oligomer effective to provide 1.5 to 5 wt % of bromine, based on the total weight of the polymers in the composition, an aromatic organophosphorus compound effective to provide 0.1 to 2.0 wt % of phosphorus, based on the total weight of the polymers in the composition, or a combination comprising at least one of the foregoing;
• and
• optionally 5 to 80 wt % or 10 to 60 wt % of a polyetherimide;
• wherein a formed sample of the composition has
• a flame time of less than 15 seconds, a burn length of less than 6 inches, and a drip extinguishing time of less than 3 seconds, each measured using the method of FAR 25.853(d), in accordance with FAR 25.853(a)(1)(i) at a thickness of 1.5 mm;
• an OSU integrated 2 minute test value of less than 65 kW-min/m2 and a peak heat release value of less than 65 kW/m2 as measured at 1.5 mm in accordance with FAR 25.853(d);
• and
• a notched Izod value of greater than or equal to 2 ft-lbs/in at 23° C. in accordance to ASTM D256 at a thickness of 3.2 mm.