A curable mixture for preparing soft silicone elastomers having low exudation properties comprises:(a) 100 parts by weight of a vinyl-containing base polymer of the formula ##STR1## in which R and R' are alkyl having 1 to 8 carbon atoms, aryl having 3 to 8 carbon atoms, vinyl having 3 to 8 carbon atoms, and fluoroalkyl having 3 to 8 carbon atoms, with the proviso that said base polymer contains a statistical average of 0.5 to 1.8 vinyl groups per molecule, andx is a sufficiently large number that the viscosity of the polymer is between 0.1 and 300,000 Pascal-seconds at 20.degree. C.,(b) 0.1 to 50 parts by weight of an organohydrogensiloxane of the formula ##STR2## wherein R" is an alkyl having 1 to 8 carbon atoms, aryl having 3 to 8 carbon atoms or fluoralkyl having 3 to 8 carbon atoms,m is at least 3, and the sum of n and m is a sufficiently large number that said siloxane has a viscosity of 0.005 to 0.1 Pascal-seconds at 25.degree. C.,(c) 1 to 250 ppm of a platinum catalyst, and(d) 0 to 200 parts by weight of filler.