A device for deburring workpieces of rubber or plastic or the like includes an insulated chamber through which the workpieces traverse and a centrifugal throwing wheel for projected granulated material therefrom and means for embrittling the burrs of the workpieces with the blower having a vertical axis of rotation and projecting the granulated material horizontally therefrom and having a conical deflector in the blasting plane opening downwardly toward the workpieces.