The composition of claim 1, wherein the organohydrogenpolysiloxane, component (2), has the following compositional formula: Rb 2 (H)c SiO.sub.(4-b-c)/2, wherein R2 is a halogen- or cyano-substituted or unsubstituted monovalent hydrocarbon group of 1-10 carbon atoms and the letters b and c are positive numbers satisfying the following equations: 1.6???b???2.2, 0.002???c???1.0 and 1.6???b+c???3.0. 9