to the other process equipment including the grinder and separator such as sifter screens specific examples of electrically conductive solid additives that provide the process improvements of the present invention include but are no limited to carbon black e g cabot vulcan xc72r graphite flaked or powdered metals e g iron nickel copper conductive metal oxides such as tin oxide conductive polymers such as polypyrrole and electrically insulating materials coated with tin oxide e g milliken ec3010 xt tin oxide coated titanium dioxide powder specific examples of electrically insulating solid additives that provide the process improvements of the present invention include but are not limited to hydrous silicate for example purtalc u2122 usp or luzenac nicron u2122 302 melamine silica or fumed silica for example ppg flogard u2122 ff cabot cab o sil u2122 ts 530 fly ash metal stearate salts metal carbonate salts for example calcium carbonate metal sulfate salts for example calcium sulfate or barium sulfate zeolites or molecular sieves clays fluoropolymers melamine zinc oxide and titanium diboride many of these additives hydrous silicate in particular have a further advantage because they do not change the color when added with the powder to a recipe for white foam hydrous silicate has an additional advantage in that when small amounts of it are included in the foam recipe hydrous silicate does not significantly affect the manufacture of new polyurethane foam.