Plastic compositions containing small particle size zeolites and mixtures

A plastic composition which contains a zeolite as a filler, said zeolite being present in the form of small particles of said zeolite, said particles being selected from the group consisting of zeolite particles chemically similiar to zeolite X and mixtures of particles chemically similiar to mixtures of zeolite X and zeolite A, said particles having the chemical formula of zeolite X and zeolite A but differing from zeolite X and zeolite A in having larger ports or pore diameters, having bimodal pore size distribution, and having X-ray diffraction patterns depressed from those of zeolite X and zeolite A, and wherein said mixture of particles exhibits a narrow differential weight percent gaussian distribution with an average particle size of no more than about 2.2 microns with at least 90 percent of the weight between 0.1 and 5.0 microns in diameter, wherein the cumulative percent population exhibits at least 41 percent by weight less than one micron, with no more than 5 percent by weight greater than 3.2 microns in diameter, and a surface area of greater than 100 m.sup.2 /g.