Polyglycidyloxypropyl silsesquioxane, which has an excellent heat resistance, was combined with sheet-like and spherical titanate as nano-fillers. The burning property of the composites was related to the shape of the dispersed titanate. A burning test was carried out according to the UL-94 test method. As a result, though the test specimen burned from one end to the other in the spherical titanate filled composite system, a fire extinguishing Property was observed in the sheet-like titanate filled composite system. The extinguishing time of the latter system classified V-0 in the specification test. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 110: 26492655, 2008