A process for condensing an organosilicon compound represented by the formula: wherein R is a methyl group, p and q each have a value of at least one and the sum of p and q has a value of at least eight to produce a diorganopolysiloxane gum, which process comprises heating an organosilicon compound represented by said formula to a temperature from 25 C. to 170 C. in the presence of from 0.001 par