TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polymer layers comprise fiber reinforcement. The nanofiber-filled silicone composition further comprises solvent, provided when curable silicone composition is hydrosilylation-curable silicone composition, the solvent is aprotic. The curable silicone composition is selected from hydrosilylation-curable silicone composition, condensation-curable silicone composition, radiation-curable silicone composition, and peroxide-curable silicone composition. Preferred Components: The polymer layer has thickness of 0.01-1000 ~m m. The film has 1-10 (preferably 1) polymer layers. The aluminum oxide nanofibers are untreated or treated. The aluminum oxide nanofibers comprise (wt./wt.%) ~c -AlO(OH) (0-100, preferably 30-99) and ~c -Al2O3 (0-100, preferably 1-70), and the concentration of aluminum oxide nanofibers in polymer layer is 0.001-50 wt./wt.%. The fiber reinforcement is selected from woven fabric, nonwoven fabric, individual fibers and glass fibers. The silicone resin has formula (R1(R2)2SiO1/2)w((R-2)2SiO2/2)x(R2siO3/2)y(SiO4/2)z (I), (R1(R3)2SiO1/2)w((R3)2SiO2/2)x(R3SiO3/2)y(SiO4/2)z (II), (R4(R5)2SiO1/2)w((R5)2SiO2/2)x(R5Si3/2)y(SiO4/2)z (III), (R7(R8)2SiO1/2 )w((R8)2SiO2/2)x(R8SiO3/2)y(SiO4/2)z (IV), or (R1(R11)2SiO1/2)w((R11)2SiO2/2)x(R11SiO3/2)y(SiO4/2)z (V).R1=1-10C hydrocarbyl (optionally halogen substituted and free of aliphatic unsaturation);R2=R1 or alkenyl;R3=R1 or -H;R4=1-10C hydrocarbyl (optionally halogen substituted);R5=R4, -H, -OH, or hydrolyzable group;R7=1-10C hydrocarbyl (optionally halogen substituted), or -OR6;R6=1-8C hydrocarbyl (optionally halogen substituted);R8=R1, -H, or radiation sensitive group;R11= acryloxyalkyl (optionally substituted), R1, alkenyl, alkynyl;w and x=0-0.95;y=0-1;z=0-0.9;y+z=0.1-1;orw+x+y+z=1.provided that the silicone resin has an average of at least two silicon-bonded alkenyl groups per molecule. EXAMPLE - A dispersion comprising (g) aluminum oxide fiber (2), acetic acid (4.4), and de-ionized water (35.6) was heated for 120 hours and cooled to room temperature. The mixture was worked up to give supernatant dispersion (D1). A resin solution comprising (g) ORGANOSILICASOL IPA-ST (RTM: colloidal silica) (200) and de-ionized water (28) was stirred and chilled with ice water bath to 2?0 C. Methyltrimethoxysilane (70.72) and acetic acid (3.48) were added to the mixture and worked up to obtain resin solution. The resin solution was translucent and had solid content 24.5 wt./wt.%. A silicone composition was prepared by combining the resin solution (8.2 g) with dispersion (D1) (50 g). Glass fabric was impregnated with silicone composition. The impregnated fabric was dry and then cured in oven at 125?0 C for 1 hour and the silicone resin film was allowed to cool to room temperature. The reinforced silicone resin film was then heat-treated in oven and the reinforced silicone resin film was allowed to cool to room temperature. The heat-treated film was free of cracks.