Abstract: Sulfur containing organosilicon compounds having the formula:Z--Alk--S.sub.x --Alk--Zin which Z is: ##STR1## where R.sub.1 is alkyl of 1 to 4 carbon atoms, cycloalkyl of 5 to 8 carbon atoms or phenyl and R.sub.2 is alkoxy of 1 to 4 carbon atoms, cycloalkoxy of 5 to 8 carbon atoms or phenoxy. Alk is a divalent aliphatic hydrocarbon or a cyclic hydrocarbon group containing 1 to 8 carbon atoms and x is a number from 2 to 6 are used as cross-linking agents in rubber mixtures containing conventional vulcanization accelerators and a siliceous filler, and optionally carbon black. No sulfur is present.

Abstract: There are prepared vulcanizable rubber containing mixtures comprising at least one halogen rubber, at least one silicate filler in an amount of 1 to 250 parts by weight, magnesium oxide, zinc oxide or lead oxide in an amount of 0.1 to 15 parts by weight, sulfur in an amount of 0 to 15 parts by weight, stearic acid or other higher fatty acid, benzoic acid or salicylic acid in an amount of 0 to 10 parts by weight, at least one vulcanization accelerator in an amount of 0 to 10 parts by weight, at least one plasticizer in an amount of 0 to 100 parts by weight, at least one stabilizer from the group consisting of antiagers, fatigue inhibitors, antioxidants, light protecting agents and ozone protecting agents in an amount of 0 to 10 parts by weight, carbon black in an amount of 0 to 150 parts by weight and at least one organosilane having the formulaX--C.sub.m H.sub.2m --SiR.sub.n.sup.1 (OR).sub.3-n,while X is chlorine, bromine or iodine, m is a number from 1 to 5, R.sup.1 is a C.sub.1 to C.sub.5 -alkyl group, a C.