Machines for grinding and parts therefor, namely, ceramic marbles composed of a mixture of electro-melted zircon and silica and marbles for use as grinding agents, micro-grinding agents, dispersion agents for said grinding machines for use in the paint, varnish, ink, pigment, colorant, magnetic lacquer, enamel, mineral charge, phyto-sanitary product and cosmetic industries

pre-formed ceramics in the form of bricks, billets and part geometries for high temperature applications