Kieselgur; silica gels; bentonite; gas purifying preparations, namely, chemicals for use in purifying gas; mineral substances in the nature of filtering materials in the water treatment industry; chemical preparations to prevent mildew; activated carbons for general industrial use; carbon for filters; chemical getters; diatomaceous earth; gas propellants for aerosols; chemicals for use in purifying water; carbon black for industrial purposes; absorbing carbons for general industrial use