Curable composition

A curable composition that comprises:

• (A) a polymerized product comprising a linear organosiloxane compound, which is represented by an average composition formula of Formula 1 and, of which a molar ratio of an alkenyl group bound to a silicon atom with respect to the total silicon atoms ranges from 0.02 to 0.2;
• (B) a crosslinked organosiloxane compound, which is represented by an average composition formula of Formula 2, and of which a molar ratio of an alkenyl group bound to a silicon atom with respect to the total silicon atoms ranges from 0.15 to 0.35;
• and
• (C) a hydrogen siloxane compound, which is represented by Formula 3, and of which a molar ratio of a hydrogen atom bound to a silicon atom with respect to the total silicon atoms ranges from 0.2 to 0.8,
• the crosslinked organosiloxane compound being comprised in a weight ratio of 50 parts by weight to 700 parts by weight relative to 100 parts by weight of the linear organosiloxane compound, and
• a molar ratio of a hydrogen atom bound to a silicon atom in the siloxane compound with respect to an alkenyl group bound to a silicon atom in the linear and crosslinked organosiloxane compounds ranging from 0.8 to 1.2:
• (R1R2R3SiO1/2)a(R4R5SiO2/2)b(R6SiO3/2)c(SiO4/2)d [Formula 1]
• (R7R8R9SiO1/2)e(R10R11SiO)f(R12SiO3/2)g(SiO4/2)h [Formula 2]
• wherein R1 to R12 independently represent an alkoxy group, a hydroxy group, an epoxy group or a monovalent hydrocarbon group, with the provision that at least one of R1 to R6 is an alkenyl group and at least one of R7 to R12 is an alkenyl group;
• R's independently represent hydrogen, an epoxy group or a monovalent hydrocarbon group;
• a is in a range of 0 to 0.5, b is in a range of 0.5 to 0.98, c is in a range of 0 to 0.2, d is in a range of 0 to 0.1, e is in a range of 0 to 0.5, f is in a range of 0 to 0.3, g is in a range of 0.3 to 0.85, h is in a range of 0 to 0.2, n is in a range of 1 to 10, with the provision that a+b+c+d is 1 and e+f+g+h is 1.