(April 2015) Corruption in Brazil exists on all levels of society from the top echelons of political power (as seen in the MensalÃ£o Scandal and the Operation Car Wash and the Petrobras scandals) to the smallest municipalities.
Quartz sands, which are high in silica content, are used to make glass. When quartz sands are crushed they produce particles with sharp, angular edges that are sometimes used to make sandpaper for smoothing wood. Some quartz sand is found in the form of sandstone.
Black Waterproof Discs are Silicon Carbide paper sanding discs for wet or dry sanding. Disc grips to the appropriate back up pad attached to an orbital or DA disc sander or angle grinder. Used for wet sanding on engineered stone, natural stone, glass, plastic, fiberglass and concrete.