An addition curing silicone rubber composition comprising (A) an alkenyl-containing
organopolysiloxane, (B) a resinous copolymer composed mainly of R3SiO1/2
units and SiO2 units in a molar ratio between 0.5/1 and 1.5/1 wherein
R stands for a monovalent hydrocarbon group and is substantially free of alkenyl
groups, (C) a resinous copolymer composed mainly of R3SiO1/2
units and SiO2 units in a molar ratio between 0.5/1 and 1.5/1
wherein R stands for a monovalent hydrocarbon group and includes an alkenyl
group, and the total content of alkenyl groups is at least 0.0001 mol/g, (D) an
organohydrogenpolysiloxane, and (E) an addition reaction catalyst cures into a
silicone rubber sheet that has a satisfactory rubber strength and surface adhesive property.