Curable liquid silicone rubber composition for forming a sealing member and sealing member

A through hole-containing sealing member, comprising a silicone rubber provided by curing a curable liquid silicone rubber composition comprising

• (A) 100 weight parts of a liquid organopolysiloxane that is represented by the average unit formula:
• RaSiO(4-a)/2 wherein R is an unsubstituted monovalent hydrocarbyl group or a halogenated monovalent hydrocarbyl group and a is 1.95 to 2.05, that contains at least two silicon-bonded alkenyl groups in each molecule, and that has a viscosity at 25° C. of 100 to 100,000 mPa·s;
• (B) 10 to 100 weight parts of a reinforcing silica filler;
• (C) an organohydrogenpolysiloxane that has at least two hydrosilyl groups in each molecule, in an amount that provides (1.0:1) to (3.0:1) for the ratio between the number of moles of hydrosilyl groups in this component and the number of moles of alkenyl groups in component (A);
• (D) a platinum group catalyst, in a catalytic amount;
• (E) a liquid organopolysiloxane that does not contain an aliphatically unsaturated group, hydrosilyl group, and silanol group, that has a viscosity at 25° C. of 10 to 100,000 mPa·s, and that is compatible with component (A), in an amount that is 15 to 31 weight % of the total of components (A) to (F);
• and
• (F) a liquid organopolysiloxane that does not contain an aliphatically unsaturated group, hydrosilyl group, and silanol group, that has a viscosity at 25° C. of 10 to 100,000 mPa·s, and that is incompatible with component (A), in an amount that is 1.0 to 10 weight % of the total of components (A) to (F),
• wherein the silicone rubber has a hardness, measured using a type A durometer according to JIS K 6253, “Hardness Test Method for Vulcanized Rubbers”, of 15 to 26 and has a tensile stress at 100% elongation, measured according to JIS K 6251, “Vulcanized Rubbers and Thermoplastic Rubbers—Determination of Tensile Properties”, of 0.25 to 0.60 MPa.