In a process for preparing discrete, finely divided, tack-free, pourable, powdery, filler-containing elastomer particles from an admixture of (a) an aqueous elastomer emulsion comprising (i) a solution of elastomer dissolved in a volatile, inert organic solvent having a boiling point below 100*C, (ii) an elastomer emulsifying amount of an alkylamine oxyalkylate surfactant, and (iii) water; and (b) an aqueous suspension or dispersion of a solid, finely divided elastomer filler, which comprises gradually introducing said admixture into an aqueous alkali silicate solution containing 2-20 moles of SiO2 per mole of said alkylamine oxyalkylate while maintaining said silicate solution at an acidic pH of 0.1-7 and simultaneously evaporating said volatile organic solvent to form said filler-containing elastomer particles, the improvement which comprises: EMPLOYING SAID ADMIXTURE OF (A) AND (B) IN THE FORM OF A STABLE, AQUEOUS EMULSION CONTAINING AN EMULSION-STABILIZING AMOUNT OF AN IONIC, WATER SOLUBLE PROTECTIVE COLLOID AND HAVING AN ALKALINE PH of 7-14.