OPS Colloidal Silica, 0.04-micron , White. OPS stands for Active Oxide Polishing Suspension is an oxide polishing suspensions have been formulated to reduce polishing time and priced very economically. Oxide suspensions under normal use may be diluted with water. Used as is for polishing aluminum, zirconium ant other ductile metals. In most cases a perfect surface finish of the prepared specimen requires a final step using oxide polishing. The Oxide Polishing Suspensions produce an absolutely scratch-free and deformation-free surface.